IEC 62343:2023
(Main)Dynamic modules - Generic specification
Dynamic modules - Generic specification
IEC 62343:2023 applies to all commercially available optical dynamic modules and devices. It describes the products covered by the IEC 62343 series, defines terminology, fundamental considerations and basic approaches. The object of this document is to:
- establish uniform requirements for operation, reliability and environmental properties of dynamic modules (DMs) to be implemented in the appropriate DM standard, and
- provide assistance to the purchaser in the selection of consistently high-quality DM products for their particular applications, as well as in the consultation of the appropriate specific DM standard(s).
This document covers performance templates, performance standards, reliability qualification requirements, hardware and software interfaces and related testing methods. Since a dynamic module integrates an optical module/device, printed wiring board, and software/firmware, the standards developed in the series will mimic appropriate existing standards. On the other hand, since "dynamic module" is a relatively new product category, the dynamic module standards series will not be bound by the existing practices where requirements differ.The safety standards as related to dynamic modules are mostly optical power considerations, which is covered by the IEC 60825 series (see Clause 6). This third edition cancels and replaces the second edition published in 2017. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- addition of terms and definitions for optical multicast switches (3.8);
- revision of Clause 4, listing the requirements for standards in the IEC 62343 series;
- addition of Clause 6 (Safety requirements).
Modules dynamiques - Spécification générique
IEC 62343:2023 s’applique à tous les dispositifs et modules dynamiques optiques disponibles dans le commerce. Elle décrit les produits couverts par la série IEC 62343, définit la terminologie, les considérations fondamentales et les approches de base. Le présent document a pour objets:
- d’établir des exigences uniformes pour le fonctionnement, la fiabilité et les propriétés environnementales des modules dynamiques (DM) à intégrer dans la norme appropriée sur les modules dynamiques, et
- d’aider l’acheteur à choisir des produits à modules dynamiques de haute qualité dans le cadre de ses applications particulières et à consulter les normes appropriées sur les modules dynamiques spécifiques.
Le présent document couvre les modèles de performance, les normes de performance, les exigences sur la qualification de la fiabilité, les interfaces matérielles et logicielles et les méthodes d’essais associées. Puisqu’un module dynamique intègre un module ou un dispositif optique, une carte imprimée et un logiciel ou un microprogramme, les normes développées dans la série calquent des normes existantes appropriées. D’autre part, un "module dynamique" étant une catégorie de produit relativement nouvelle, la série de normes sur les modules dynamiques n’est pas limitée par les pratiques existantes dans lesquelles les exigences diffèrent. Les normes de sécurité se rapportant aux modules dynamiques sont principalement des considérations sur la puissance optique, qui sont traitées par la série IEC 60825 (voir l’Article 6).
Cette troisième édition annule et remplace la deuxième édition parue en 2017. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l’édition précédente:
- ajout de termes et de définitions relatifs aux commutateurs optiques multidiffusions (3.8);
- révision de l’Article 4 énumérant les exigences relatives aux normes de la série IEC 62343;
- ajout de l’Article 6 (Exigences de sécurité).
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Dynamic modules – General and guidance Generic specification
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IEC 62343 ®
Edition 3.0 2023-01
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Dynamic modules – General and guidance Generic specification
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.180.01; 33.180.99 ISBN 978-2-8322-6356-3
– 2 – IEC 62343:2023 RLV © IEC 2023
CONTENTS
FOREWORD . 4
INTRODUCTION . 2
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 8
3.1 General terms and definitions . 9
3.2 Dynamic module terms and definitions . 9
3.3 Dynamic channel equalizer (DCE) terms and definitions . 10
3.4 Tuneable dispersion compensator (TDC) or dynamic chromatic dispersion
compensator (DCDC) terms and definitions . 10
3.5 Dynamic gain tilt equalizer (DGTE) terms and definitions . 11
3.6 Optical channel monitor (OCM) terms and definitions . 12
3.7 Wavelength selective switch (WSS) terms and definitions . 15
3.8 Optical multicast switch (MCS) terms and definitions . 23
4 Preparation of standards .
4.1 General .
4.2 Product definition .
4.3 Tests .
4.4 Details .
4.5 Requirements .
4.6 Sample size .
4.7 Sample definition .
4.8 Groupings/sequences .
4.9 Pass/fail criteria .
4.10 Reference product definition .
4.11 Performance standard test report .
4 Requirements . 23
4.1 General . 31
4.2 Performance standards and performance specification templates . 32
4.3 Quality assessment . 32
4.4 Control interface standards . 32
4.5 Test methods . 32
4.6 Operating, storage and transportation conditions . 33
4.7 Product identification for storage and shipping . 33
5 Electromagnetic compatibility (EMC) requirements . 33
6 Safety requirements . 33
Bibliography . 34
Figure 1 – Illustration of X-dB bandwidth . 16
Figure 2 – Illustration of adjacent channel crosstalk and adjacent channel isolation . 18
Figure 3 – Illustration of non-adjacent channel crosstalk . 19
Figure 4 – Illustration of latency, rise, fall, bounce, and switching times . 21
Figure 5 – Functional block diagram of the MCS . 24
Figure 6 – Illustration of latency, rise, fall, bounce, and switching times . 29
Table 1 – Document structure of the IEC 62343 series . 32
– 4 – IEC 62343:2023 RLV © IEC 2023
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
DYNAMIC MODULES – GENERAL AND GUIDANCE
GENERIC SPECIFICATION
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
rights. IEC shall not be held responsible for identifying any or all such patent rights.
This redline version of the official IEC Standard allows the user to identify the changes made to
the previous edition IEC 62343:2017. A vertical bar appears in the margin wherever a change has
been made. Additions are in green text, deletions are in strikethrough red text.
IEC 62343 has been prepared by subcommittee 86C: Fibre optic systems and active devices,
of IEC technical committee 86: Fibre optics. It is an International Standard.
This third edition cancels and replaces the second edition published in 2017. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) addition of terms and definitions for optical multicast switches (3.8);
b) revision of Clause 4, listing the requirements for standards in the IEC 62343 series;
c) addition of Clause 6 (Safety requirements).
The text of this International Standard is based on the following documents:
Draft Report on voting
86C/1803/CDV 86C/1827/RVC
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
A list of all parts of the IEC 62343 series, published under the general title Dynamic modules,
can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The "colour inside" logo on the cover page of this document indicates that it
contains colours which are considered to be useful for the correct understanding of its
contents. Users should therefore print this document using a colour printer.
– 6 – IEC 62343:2023 RLV © IEC 2023
INTRODUCTION
This document applies to dynamic devices as defined in IEC TS 62538. This document contains
general guidance for the IEC 62343 series related to dynamic devices and definitions which
apply to dynamic devices. The dynamic module (DM), or device, has two distinguishing
characteristics: dynamic and module.
"Dynamic" highlights the functions of the products to include "tuning, varying, switching,
configuring, and other continuous optimization," often accomplished by electronics, firmware,
software or their combinations. The dynamic device usually has a certain level of intelligence
to monitor or measure the situation its configuration or settings and make decisions for
necessary (optimization) actions. The behaviour of dynamic modules may can be characterized
by transient characteristics as the dynamic module undergoes tuning, switching, configuring,
and other continuous optimization. Characterization of transient characteristics will be
considered in individual dynamic module standards.
"Module" defines that products covered by this document are the integration of active and
passive components (either or both), through interconnecting materials or devices. The
controlling electronics can be inside or outside the optical package that contains all or most of
the optical components and interconnection. The product can be a small printed wiring board
(PWB) or child-board with mounted optical module, or it can be a small box (e.g., housing) with
optical components and electronics enclosed. In the former case, it is more like an assembly
(i.e., generally not packaged in a box or housing) than a module (i.e., generally packaged in a
box or housing).
For historical reasons and convenience, a dynamic module or device is referred to as a dynamic
module in the IEC 62343 series.
The number of dynamic modules and devices is rapidly growing as optical communications
networks evolve. The following list provides some examples of the products covered by the
IEC 62343 series. It should be noted that the list is not exhaustive and the products to be
covered are not limited by the listed examples:
• channel gain equalizer;
• dynamic channel equalizer;
• dynamic gain tilt equalizer;
• dynamic slope equalizer;
• tuneable chromatic dispersion compensator;
• polarization mode dispersion compensator;
• reconfigurable optical add-drop multiplexer;
• switch with monitoring and controls;
• variable optical attenuator with monitoring and controls;
• optical channel monitor;
• wavelength selective switch;
• optical multicast optical switch.
The IEC 62343 series covers performance templates, performance standards, reliability
qualification requirements, hardware and software interfaces, and related testing methods.
The structure of the IEC 62343 series, under the general title Dynamic modules, is as follows:
• IEC 62343-1 series Part 1: Performance standards
• IEC 62343-2 series Part 2: Reliability qualification
• IEC 62343-3 series Part 3: Performance specification templates
• IEC 62343-4 series Part 4: Software and hardware interface
• IEC 62343-5 series Part 5: Test methods
• IEC 62343-6 series Part 6: Design guides guidelines
A complete set of standards related to a dynamic module or device should include the following:
• optical performance standards;
• reliability qualification standards;
• optical performance specification templates;
• hardware and software interface standards;
• test methods;
• technical reports.
The safety standards related to dynamic modules are mostly optical power considerations,
which are covered by IEC TC 76: Optical radiation safety and laser equipment the IEC 60825
series.
Only those dynamic modules for which standards are complete or in preparation are included
in Clause 3. To reflect the rapidly growing market for dynamic modules, additional terms and
definitions will be added in subsequent revisions as the series expands.
It should be noted that optical amplifiers could be regarded as dynamic modules. They are not
included in the IEC 62343 series but are covered in their own series of IEC standards.
– 8 – IEC 62343:2023 RLV © IEC 2023
DYNAMIC MODULES – GENERAL AND GUIDANCE
GENERIC SPECIFICATION
1 Scope
This document applies to all commercially available optical dynamic modules and devices. It
describes the products covered by the IEC 62343 series, defines terminology, fundamental
considerations and basic approaches.
The object of this document is to
• establish uniform requirements for operation, reliability and environmental properties of
dynamic modules (DMs) to be implemented in the appropriate DM standard, and
• provide assistance to the purchaser in the selection of consistently high-quality DM products
for their particular applications, as well as in the consultation of the appropriate specific DM
standard(s).
This document covers performance templates, performance standards, reliability qualification
requirements, hardware and software interfaces and related testing methods.
Since a dynamic module integrates an optical module/device, printed wiring board, and
software/firmware, the standards developed in the series will mimic appropriate existing
standards. On the other hand, since "dynamic module" is a relatively new product category, the
dynamic module standards series will not be bound by the existing practices where
requirements differ.
The safety standards as related to dynamic modules are mostly optical power considerations,
which is covered by IEC TC 76: Optical radiation safety and laser equipment the IEC 60825
series (see Clause 6).
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies.
For undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60050-731, International Electrotechnical Vocabulary – Chapter 731: Optical fibre
communication (available at www.electropedia.org)
IEC TR 61931, Fibre optic – Terminology
IEC Guide 107, Electromagnetic compatibility – Guide to the drafting of electromagnetic
compatibility publications
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-731,
IEC TR 61931, and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
NOTE 1 Some terms and definitions included in this document were first published in
the IEC 62343 series. After publication of this document, these terms and definitions will be removed from the
IEC 62343 series when the series is revised, and reference will be made to IEC 62343.
NOTE 2 The terms and definitions listed in Clause 3 refer to the meaning of the terms and definitions used in the
specifications of dynamic modules. Only those parameters listed in the appropriate performance standard in the
IEC 62343-1 series and performance specification templates in the IEC 62343-3 series are intended to be specified.
NOTE 3 The list of parameter definitions for dynamic modules given in Clause 3 is divided into subclauses according
to the type of dynamic module.
3.1 General terms and definitions
3.1.1
optical dynamic device
optical device designed to monitor and control dynamically some characteristics of one or more
optical signals, by means of suitable electronic controls, in order to improve or to maintain
definite performances of the system in which it is intended to be inserted
Note 1 to entry: Said characteristics may include optical paths, optical intensities, spectral characteristics,
polarization states, dispersion, etc.
Note 2 to entry: Optical dynamic devices may comprise optical active and optical passive elements or components.
Note 3 to entry: The control/response time of optical dynamic devices is much larger than the signal time
characteristics and typically may range from few microseconds to tens of seconds.
[SOURCE: IEC TS 62538:2008, 2.1.1]
3.1.2
optical module
packaged integration of optical components and/or elements, accomplishing defined
functionality, typically repairable and re-workable
[SOURCE: IEC TS 62538:2008, 2.2.5, modified – The notes to entry have been omitted.]
3.2 Dynamic module terms and definitions
3.2.1
channel
signal at wavelength, λ, that corresponds to ITU grid (ITU-T Recommendation G.694.1) within
the range of operating wavelength range
[SOURCE: IEC 62343-3-3:2014, 3.4]
3.2.2
operating wavelength range
specified range of wavelengths from λ to λ about a nominal operating wavelength λ ,
imin imax I
within which a dynamic optical module is designed to operate with a specified performance
3.2.3
channel frequency range
frequency range within which a device is expected to operate with a specified performance
Note 1 to entry: For a particular nominal channel central frequency, f , the channel frequency range is from
nomi
f = (f – ∆f ) to f = (f + ∆f ), where ∆f is the maximum channel central frequency deviation.
imin nomi max imax nomi max max
– 10 – IEC 62343:2023 RLV © IEC 2023
3.2.4
channel spacing
centre-to-centre difference in frequency (or wavelength) between adjacent channels in a device
3.3 Dynamic channel equalizer (DCE) terms and definitions
3.3.1
dynamic channel equalizer
DCE
device capable of transforming, by internal or external automatic control, a multichannel input
signal with time-varying averaged powers into an output signal in which all working channel
powers are nominally equal or are set for a required level of pre-emphasis
Note 1 to entry: A DCE may also provide the extinction of one or more of the input channels.
3.3.2
channel non-uniformity
difference between the powers of the channel with the most power (in dBm) and the channel
with the least power (in dBm)
Note 1 to entry: The channel non-uniformity applies to a multichannel signal across the operating wavelength range.
Note 2 to entry: Channel non-uniformity is expressed in dB.
3.3.3
in-band extinction ratio
difference, within the operating wavelength range, between the minimum power of the non-
extinguished channels (in dBm) and the maximum power of the extinguished channels (in dBm)
Note 1 to entry: In-band extinction ratio is expressed in dB.
3.3.4
out-of-band attenuation
attenuation of channels that fall outside of the operating wavelength range
Note 1 to entry: Out-of-band attenuation is expressed in dB.
3.3.5
ripple
peak-to-peak difference in insertion loss within a channel frequency (or wavelength) range
3.3.6
channel response time
elapsed time it takes a device to transform a channel from a specified initial power level to a
specified final power level desired state, when the resulting output channel non-uniformity
tolerance is met, measured from the time the actuation energy is applied or removed
3.4 Tuneable dispersion compensator (TDC) or dynamic chromatic dispersion
compensator (DCDC) terms and definitions
3.4.1
tuneable dispersion compensator
TDC
dynamic chromatic dispersion compensator
DCDC
two-port in-line device that is capable of transforming, by internal or external automatic control,
an input signal with time-varying dispersion into an output signal in which an output channel
dispersion value is set for a required level of value
3.4.2
insertion loss ripple
maximum peak-to-peak variation of the insertion loss within a channel frequency (or
wavelength) range
3.4.3
dispersion tuning time
longest elapsed time it takes a module to change a dispersion setting from an arbitrary initial
dispersion value to a desired final dispersion value, when the resulting dispersion target
tolerance is met
3.5 Dynamic gain tilt equalizer (DGTE) terms and definitions
3.5.1
dynamic spectral equalizer
DSE
two port in-line dynamic module that converts an input signal with time-varying spectral shape
into an output signal in which spectral shape is nominally flat, or is set for a required spectral
shape for pre-emphasis
3.5.2
dynamic gain tilt equalizer
DGTE
dynamic spectral equalizer used in an optical amplifier that converts input signals with time-
varying gain tilt into output signals in which gain tilt is nominally flat, or is set for a required gain
tilt
3.5.3
dynamic gain tilt range
difference between the maximum and minimum deviation of attenuation over operating
wavelength range, to which the dynamic gain tilt equalizer can be set
3.5.4
positive slope type
type of DGTE for which dynamic gain tilt range can be set for positive gain tilt
3.5.5
negative slope type
type of DGTE for which dynamic gain tilt range can be set for negative gain tilt
3.5.6
both slope type
type of DGTE to which dynamic gain tilt range can be set for both positive and negative gain tilt
3.5.7
slope linearity
maximum deviation of attenuation between the spectral shape by dynamic gain tilt equalizer
and linear slope over the operating wavelength range
3.5.8
response time
longest elapsed time it takes a dynamic gain tilt equalizer to
change a gain tilt setting from an arbitrary initial gain tilt value to a desired final gain tilt value,
when the resulting gain tilt target tolerance is met
– 12 – IEC 62343:2023 RLV © IEC 2023
3.6 Optical channel monitor (OCM) terms and definitions
3.6.1
input channel plan
entire set of ITU channels on which the optical channel monitor is reporting
3.6.2
input channel frequency spacing tolerance
centre-to-centre difference in frequency (or wavelength) between adjacent channels in a device
3.6.3
input channel power dynamic range
full range of input power per channel between the saturation and sensitivity limits
3.6.4
input channel non-uniformity
difference between the powers of the channel with the most power (in dBm) and the channel
with the least power (in dBm) during one measurement within the response time
Note 1 to entry: Input channel non-uniformity applies to a multichannel signal across the operating wavelength
range.
Note 2 to entry: Input channel non-uniformity is expressed in dB.
3.6.5
input adjacent channel non-uniformity
difference between the powers of adjacent channels present during one measurement within
the response time
Note 1 to entry: The input adjacent channel non-uniformity applies to a multichannel signal across the operating
wavelength range.
Note 2 to entry: In-band extinction ratio is expressed in dB.
3.6.6
input channel non-uniformity for channel identification
difference between the powers of the channel with the most power and the channel with the
least power during one measurement within the response time for positively identifying all
channels present and not falsely identifying channels that are not present
Note 1 to entry: Input channel non-unformity for channel identification applies to a multichannel signal across the
operating wavelength range.
Note 2 to entry: In-band extinction ratio is expressed in dB.
3.6.7
input adjacent channel non-uniformity for channel identification
difference between the powers of adjacent channels present during one measurement within
the response time for positively identifying all channels present and not falsely identifying
channels that are not present
Note 1 to entry: Input adjacent channel non-uniformity for channel identification applies to a multichannel signal
across the operating wavelength range.
Note 2 to entry: In-band extinction ratio is expressed in dB.
3.6.8
input total band power dynamic range for channel measurements
full range of input total band power between the saturation or sensitivity limits of channel
measurements
3.6.9
input total band power dynamic range for total band power measurements
full range of input total band power between the saturation or sensitivity limits of total band
power measurements
3.6.10
input optical signal-noise ratio (OSNR) dynamic range
full range of input OSNR per channel within which the power, total band power and OSNR
measurements remain within their respectively specified error limits
3.6.11
input channels bit rates
list of bit rates to which any channel may be modulated
3.6.12
reference measurement bandwidth
integration bandwidth of the optical power measurement
3.6.13
noise equivalent bandwidth
integration bandwidth of the optical noise measurement
3.6.14
channel power absolute error
maximum difference between the measured channel power and the calibrated reference
channel power, within the specified measurement integration bandwidth, during one
measurement within the response time, specified over all input and operating ranges
3.6.15
channel power relative error
maximum variation of the channel power absolute error, during one measurement within the
response time, specified over all input and operating ranges
3.6.16
channel power variability
maximum variation of the channel power absolute error over the repeatability time interval at a
given input and operating condition, specified over all input and operating ranges
3.6.17
channel power resolution interval
smallest increment of the reported channel power measurement value
3.6.18
channel power polarization dependent error
maximum power measurement difference over all polarization states at a given input and
operating condition, during one measurement within the response time, specified over all input
and operating ranges
3.6.19
total band power absolute error
difference between the measured total power and the calibrated total power reference, each
integrated over the frequency band, during one measurement within the response time,
specified over all input and operating ranges
3.6.20
total band power relative error
maximum variation of the total band absolute error, during one measurement within the
response time, specified over all input and operating ranges
– 14 – IEC 62343:2023 RLV © IEC 2023
3.6.21
total band power variability
maximum variation of the total band power absolute error over the repeatability time interval at
given input and operating conditions, specified over all input and operating ranges
3.6.22
total band power resolution interval
smallest increment of the reported total band power measurement value
3.6.23
frequency absolute error
maximum difference between the measured frequency and the calibrated reference frequency,
during one measurement within the response time, specified over all input and operating ranges
3.6.24
frequency relative error
maximum variation of the frequency absolute error, during one measurement within the
response time, specified over all input and operating ranges
3.6.25
frequency variability
maximum variation of the frequency absolute error over the repeatability time interval at given
input and operating conditions, specified over all input and operating ranges
3.6.26
frequency resolution interval
smallest increment of the reported frequency measurement value
3.6.27
frequency polarization dependent error
maximum frequency measurement difference over all polarization states at given input and
operating conditions, during one measurement within the response time, specified over all input
and operating ranges
3.6.28
OSNR absolute error
maximum difference between the measured and the calibrated reference OSNR, during one
measurement within the response time, specified over all input and operating ranges
3.6.29
OSNR relative error
maximum variation of the OSNR absolute error, during one measurement within the response
time, specified over all input and operating ranges
3.6.30
OSNR variability
maximum variation of the OSNR absolute error over the repeatability time interval at given input
and operating conditions, specified over all input and operating ranges
3.6.31
OSNR resolution interval
smallest increment of the reported OSNR measurement value
3.6.32
OSNR polarization dependent error
maximum OSNR measurement difference over all polarization states at given input and
operating conditions, during one measurement within the response time, specified over all input
and operating ranges
3.6.33
back reflection
fraction of the optical signal reflected at the input optical port over the entire band, specified
over all input and operating ranges
3.6.34
response time
time required to perform the specified measurements for all channels
and transfer these values over the communications interface to the external controller that
issues a measurement request, specified over all input and operating ranges
3.6.35
repeatability time interval
minimum time interval over which a given measurement repeatability is performed
3.7 Wavelength selective switch (WSS) terms and definitions
3.7.1
wavelength selective switch
WSS
dynamic module with one or more input ports and one or more output ports, which is mainly
used in a reconfigurable optical add drop multiplexer (ROADM) system to switch each
wavelength signal on each input port independently to its required output port in dense
wavelength division multiplexing (DWDM) networks
Note 1 to entry: A WSS is electrically controlled with software.
Note 2 to entry: Optical paths through the WSS operate bi-directionally, thus ports can be configured as either input
or output ports.
Note 3 to entry: Each wavelength signal can be independently attenuated.
[SOURCE: IEC 62343-4-1:2016, 3.1.1, modified – Note 2 to entry has been replaced by a new
note.]
3.7.2
insertion loss
IL
value of the reduction in optical power at a particular wavelength between the two conducting
ports
Note 1 to entry: The insertion loss is the reduction in optical power between an input and output port of a module
expressed in decibels.
IL = –10 log (P /P )
10 out in
where
P is the optical power launched into input port;
in
P is the optical power received from the output port.
out
[SOURCE: IEC 62343-3-3:2014, 3.7]
3.7.3
insertion loss uniformity
difference between the maximum and minimum insertion loss at the output for a specified set
of input ports
[SOURCE: IEC 62343-3-3:2014, 3.8]
– 16 – IEC 62343:2023 RLV © IEC 2023
3.7.4
insertion loss ripple
maximum peak-to-peak variation of the insertion loss within a channel frequency (or
wavelength) range
[SOURCE: IEC 62343-3-3:2014, 3.9]
3.7.5
X-dB passband width
width of a channel centred about the channel central wavelength within which the optical
attenuation is within X dB
Note 1 to entry: The terms "operating wavelength range" or "channel passband" are used and have the same
meaning as "passband" for DWDM devices. The X-dB bandwidth is defined through the spectral dependence of a
ij
(where i ≠ j) as the minimum wavelength range centred about the operating wavelength λ within which the variation
h
of a is less than X dB. The minimum wavelength range is determined considering thermal wavelength shift,
ij
polarization dependence and long-term aging shift (refer to Figure 1).
Note 2 to entry: It is recommended that the passband width be specified as 0,5 dB, 1 dB and 3 dB (X = 0,5, 1 and
3).
Figure 1 – Illustration of X-dB bandwidth
[SOURCE: IEC 62343-3-3:2014, 3.10]
3.7.6
return loss
RL
fraction of input power that is returned from any port of a module expressed in decibels and
defined in the following formula at the particular wavelength between two conducting ports:
RL = –10 log (P /P )
10 refl in
where
P is the optical power launched into port;
in
is the optical power received back from the same port
P
refl
Note 1 to entry: The module can be a wavelength selective switch or an optical multicast switch.
[SOURCE: IEC 62343-3-3:2014, 3.11]
3.7.7
adjacent channel crosstalk
crosstalk restricted to the channels immediately adjacent to the (channel) wavelength number
associated with output port
Note 1 to entry: Adjacent channel crosstalk is a negative value in dB (see Figure 2).
Note 2 to entry: The adjacent channel crosstalk is different from adjacent channel isolation. In Figure 2, an up
pointing arrow shows positive, a down-pointing arrow negative. Generally, there are two adjacent channel crosstalks
for the shorter wavelength (higher frequency) side and a longer wavelength (lower frequency) side.
Note 3 to entry: The terms "crosstalk" and "isolation" are often used with almost the same meaning. However, care
should be taken not to confuse crosstalk and isolation. Crosstalk is defined so that, for wavelength selective
branching devices, the value of the ratio between the optical power of the specified signal and the specified noise is
a negative value in dB. The crosstalk is defined for each output port. Crosstalk for wavelength selective branching
devices is defined for a DEMUX (1 × N × wavelength division multiplexing (WDM) device). The crosstalk for port o to
port j is the subtraction from the insertion loss of port i to o (conducting port pair) to the isolation of port j to o (isolated
port pair). For wavelength selective branching devices having three or more ports, the crosstalk should be specified
as the maximum value of the crosstalk for each output port in dB.
[SOURCE: IEC 62343-3-3:2014, 3.12, modified – The admitted term "adjacent channel
isolation" has been deleted, the definition and notes have been rephrased, and Figure 2 has
been deleted.]
3.7.8
adjacent channel isolation
isolation restricted to the channels immediately adjacent to the (channel) wavelength number
associated with output port
Note 1 to entry: Adjacent channel isolation is a positive value in dB (see Figure 2).
Note 2 to entry: The adjacent channel isolation is different from adjacent channel crosstalk. In Figure 2, an up
pointing arrow shows positive, a down-pointing arrow negative. Generally, there are two adjacent channel isolations
for the shorter wavelength (higher frequency) side and a longer wavelength (lower frequency) side.
Note 3 to entry: The terms "crosstalk" and "isolation" are often used with almost the same meaning. However, care
should be taken not to confuse crosstalk and isolation. Isolation is the minimum value of a (where i ≠ j) within
ij
isolation wavelength range for isolated port pair. Isolation is positive value in dB.
– 18 – IEC 62343:2023 RLV © IEC 2023
Figure 2 – Illustration of adjacent channel crosstalk and adjacent channel isolation
[SOURCE: IEC 62343-3-3:2014, 3.12, modified – The preferred term "adjacent channel
crosstalk" has been deleted, the definition and Note 1 have been rephrased, and Note 3 has
been replaced by a new note.]
3.7.9
non-adjacent channel crosstalk
crosstalk restricted to each of the channels not immediately adjacent to the channel associated
with output port
Note 1 to entry: Non-adjacent channel crosstalk is different from non-adjacent channel isolation. In Figure 3, up-
pointing arrow shows positive, down-pointing arrow negative.
[SOURCE: IEC 62343-3-3:2014, 3.13, modified – The admitted term "non-adjacent channel
isolation" has been deleted, the definition has been rephrased and Figure 3 has been deleted.
3.7.10
non-adjacent channel isolation
isolation restricted to each of the channels not immediately adjacent to the channel associated
with output port
Note 1 to entry: The non-adjacent channel isolation is different from non-adjacent channel crosstalk. In Figure 3,
up-pointing arrow shows positive, down-pointing arrow negative.
Figure 3 – Illustration of non-adjacent channel crosstalk
[SOURCE: IEC 62343-3-3:2014, 3.13, modified – The preferred term "non-adjacent channel
crosstalk" has been deleted, and the definition and note have been rephrased.]
3.7.11
total channel crosstalk
total channel isolation
cumulative isolation due to the contributions at all the isolation wavelengths (frequencies) and
transfer matrix coefficient for ports i and j, t for any two ports i and j (where i ≠ j)
ij
Note 1 to entry: The total channel crosstalk is the ratio defined as
t(λ)
i j h
XT =−×10 log
tot 10
N
t(λ)
∑ i j k
k (k≠h )
where
N is the number of channels of the device;
λ is the nominal operating wavelength (frequency) for the two of ports, i and j;
h
λ are the nominal isolation wavelengths (frequencies) for the same pair of ports.
k
Note 2 to entry: Total channel crosstalk is also expressed by total channel isolation as in the following formula:
XT a λI−
( )
tot ij h tot
=
– 20 – IEC 62343:2023 RLV © IEC 2023
Note 3 to entry: Total channel crosstalk is a negative value in dB. For a WDM device, total channel crosstalk shall
be specified as the maximum value of total channel crosstalk of all channels.
[SOURCE: IEC 62343-3-3:2014, 3.14]
3.7.12
transient crosstalk
transient isolation
transient directivity
crosstalk that is attributed to both channel crosstalk (due to same wavelength and/or other
wavelengths) and port isolation, predicted to change during switching operation in WSS module
Note 1 to entry: Hitless operation means that there is no influence on other performance dur
...
IEC 62343 ®
Edition 3.0 2023-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Dynamic modules – Generic specification
Modules dynamiques – Spécification générique
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IEC 62343 ®
Edition 3.0 2023-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Dynamic modules – Generic specification
Modules dynamiques – Spécification générique
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.01; 33.180.99 ISBN 978-2-8322-6327-3
– 2 – IEC 62343:2023 © IEC 2023
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
3.1 General terms and definitions . 8
3.2 Dynamic module terms and definitions . 8
3.3 Dynamic channel equalizer (DCE) terms and definitions . 9
3.4 Tuneable dispersion compensator (TDC) or dynamic chromatic dispersion
compensator (DCDC) terms and definitions . 9
3.5 Dynamic gain tilt equalizer (DGTE) terms and definitions . 10
3.6 Optical channel monitor (OCM) terms and definitions . 10
3.7 Wavelength selective switch (WSS) terms and definitions . 14
3.8 Optical multicast switch (MCS) terms and definitions . 20
4 Requirements . 27
4.1 General . 27
4.2 Performance standards and performance specification templates . 27
4.3 Quality assessment . 28
4.4 Control interface standards . 28
4.5 Test methods . 28
4.6 Operating, storage and transportation conditions . 28
4.7 Product identification for storage and shipping . 28
5 Electromagnetic compatibility (EMC) requirements . 28
6 Safety requirements . 29
Bibliography . 30
Figure 1 – Illustration of X-dB bandwidth . 15
Figure 2 – Illustration of adjacent channel crosstalk and adjacent channel isolation . 16
Figure 3 – Illustration of non-adjacent channel crosstalk . 17
Figure 4 – Illustration of latency, rise, fall, bounce, and switching times . 19
Figure 5 – Functional block diagram of the MCS . 21
Figure 6 – Illustration of latency, rise, fall, bounce, and switching times . 26
Table 1 – Document structure of the IEC 62343 series . 27
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
DYNAMIC MODULES – GENERIC SPECIFICATION
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC Publication(s)"). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
rights. IEC shall not be held responsible for identifying any or all such patent rights.
IEC 62343 has been prepared by subcommittee 86C: Fibre optic systems and active devices,
of IEC technical committee 86: Fibre optics. It is an International Standard.
This third edition cancels and replaces the second edition published in 2017. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) addition of terms and definitions for optical multicast switches (3.8);
b) revision of Clause 4, listing the requirements for standards in the IEC 62343 series;
c) addition of Clause 6 (Safety requirements).
– 4 – IEC 62343:2023 © IEC 2023
The text of this International Standard is based on the following documents:
Draft Report on voting
86C/1803/CDV 86C/1827/RVC
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
A list of all parts of the IEC 62343 series, published under the general title Dynamic modules,
can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
INTRODUCTION
This document applies to dynamic devices as defined in IEC TS 62538. This document contains
general guidance for the IEC 62343 series related to dynamic devices and definitions which
apply to dynamic devices. The dynamic module (DM), or device, has two distinguishing
characteristics: dynamic and module.
"Dynamic" highlights the functions of the products to include "tuning, varying, switching,
configuring, and other continuous optimization," often accomplished by electronics, firmware,
software or their combinations. The dynamic device usually has a certain level of intelligence
to monitor or measure its configuration or settings and make decisions for necessary
(optimization) actions. The behaviour of dynamic modules can be characterized by transient
characteristics as the dynamic module undergoes tuning, switching, configuring, and other
continuous optimization. Characterization of transient characteristics will be considered in
individual dynamic module standards.
"Module" defines that products covered by this document are the integration of active and
passive components (either or both), through interconnecting materials or devices. The
controlling electronics can be inside or outside the optical package that contains all or most of
the optical components and interconnection. The product can be a small printed wiring board
(PWB) or child-board with mounted optical module, or it can be a small box (e.g., housing) with
optical components and electronics enclosed. In the former case, it is more like an assembly
(i.e., generally not packaged in a box or housing) than a module (i.e., generally packaged in a
box or housing).
For historical reasons and convenience, a dynamic module or device is referred to as a dynamic
module in the IEC 62343 series.
The number of dynamic modules and devices is rapidly growing as optical communications
networks evolve. The following list provides some examples of the products covered by the
IEC 62343 series. It should be noted that the list is not exhaustive and the products to be
covered are not limited by the listed examples:
• channel gain equalizer;
• dynamic channel equalizer;
• dynamic gain tilt equalizer;
• dynamic slope equalizer;
• tuneable chromatic dispersion compensator;
• polarization mode dispersion compensator;
• reconfigurable optical add-drop multiplexer;
• switch with monitoring and controls;
• variable optical attenuator with monitoring and controls;
• optical channel monitor;
• wavelength selective switch;
• optical multicast switch.
The IEC 62343 series covers performance templates, performance standards, reliability
qualification requirements, hardware and software interfaces, and related testing methods.
– 6 – IEC 62343:2023 © IEC 2023
The structure of the IEC 62343 series, under the general title Dynamic modules, is as follows:
• IEC 62343-1 series Part 1: Performance standards
• IEC 62343-2 series Part 2: Reliability qualification
• IEC 62343-3 series Part 3: Performance specification templates
• IEC 62343-4 series Part 4: Software and hardware interface
• IEC 62343-5 series Part 5: Test methods
• IEC 62343-6 series Part 6: Design guidelines
A complete set of standards related to a dynamic module or device should include the following:
• optical performance standards;
• reliability qualification standards;
• optical performance specification templates;
• hardware and software interface standards;
• test methods;
• technical reports.
The safety standards related to dynamic modules are mostly optical power considerations,
which are covered by the IEC 60825 series.
Only those dynamic modules for which standards are complete or in preparation are included
in Clause 3. To reflect the rapidly growing market for dynamic modules, additional terms and
definitions will be added in subsequent revisions as the series expands.
It should be noted that optical amplifiers could be regarded as dynamic modules. They are not
included in the IEC 62343 series but are covered in their own series of IEC standards.
DYNAMIC MODULES – GENERIC SPECIFICATION
1 Scope
This document applies to all commercially available optical dynamic modules and devices. It
describes the products covered by the IEC 62343 series, defines terminology, fundamental
considerations and basic approaches.
The object of this document is to
• establish uniform requirements for operation, reliability and environmental properties of
dynamic modules (DMs) to be implemented in the appropriate DM standard, and
• provide assistance to the purchaser in the selection of consistently high-quality DM products
for their particular applications, as well as in the consultation of the appropriate specific DM
standard(s).
This document covers performance templates, performance standards, reliability qualification
requirements, hardware and software interfaces and related testing methods.
Since a dynamic module integrates an optical module/device, printed wiring board, and
software/firmware, the standards developed in the series will mimic appropriate existing
standards. On the other hand, since "dynamic module" is a relatively new product category, the
dynamic module standards series will not be bound by the existing practices where
requirements differ.
The safety standards as related to dynamic modules are mostly optical power considerations,
which is covered by the IEC 60825 series (see Clause 6).
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies.
For undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60050-731, International Electrotechnical Vocabulary – Chapter 731: Optical fibre
communication (available at www.electropedia.org)
IEC TR 61931, Fibre optic – Terminology
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-731,
IEC TR 61931, and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
– 8 – IEC 62343:2023 © IEC 2023
NOTE 1 Some terms and definitions included in this document were first published in
the IEC 62343 series. After publication of this document, these terms and definitions will be removed from the
IEC 62343 series when the series is revised, and reference will be made to IEC 62343.
NOTE 2 The terms and definitions listed in Clause 3 refer to the meaning of the terms and definitions used in the
specifications of dynamic modules. Only those parameters listed in the appropriate performance standard in the
IEC 62343-1 series and performance specification templates in the IEC 62343-3 series are intended to be specified.
NOTE 3 The list of parameter definitions for dynamic modules given in Clause 3 is divided into subclauses according
to the type of dynamic module.
3.1 General terms and definitions
3.1.1
optical dynamic device
optical device designed to monitor and control dynamically some characteristics of one or more
optical signals, by means of suitable electronic controls, in order to improve or to maintain
definite performances of the system in which it is intended to be inserted
Note 1 to entry: Said characteristics may include optical paths, optical intensities, spectral characteristics,
polarization states, dispersion, etc.
Note 2 to entry: Optical dynamic devices may comprise optical active and optical passive elements or components.
Note 3 to entry: The control/response time of optical dynamic devices is much larger than the signal time
characteristics and typically may range from few microseconds to tens of seconds.
[SOURCE: IEC TS 62538:2008, 2.1.1]
3.1.2
optical module
packaged integration of optical components and/or elements, accomplishing defined
functionality, typically repairable and re-workable
[SOURCE: IEC TS 62538:2008, 2.2.5, modified – The notes to entry have been omitted.]
3.2 Dynamic module terms and definitions
3.2.1
channel
signal at wavelength, λ, that corresponds to ITU grid (ITU-T Recommendation G.694.1) within
the range of operating wavelength range
3.2.2
operating wavelength range
specified range of wavelengths from λ to λ about a nominal operating wavelength λ ,
imin imax I
within which a dynamic optical module is designed to operate with a specified performance
3.2.3
channel frequency range
frequency range within which a device is expected to operate with a specified performance
Note 1 to entry: For a particular nominal channel central frequency, f , the channel frequency range is from
nomi
f = (f – ∆f ) to f = (f + ∆f ), where ∆f is the maximum channel central frequency deviation.
imin nomi max imax nomi max max
3.2.4
channel spacing
centre-to-centre difference in frequency (or wavelength) between adjacent channels in a device
3.3 Dynamic channel equalizer (DCE) terms and definitions
3.3.1
dynamic channel equalizer
DCE
device capable of transforming, by internal or external automatic control, a multichannel input
signal with time-varying averaged powers into an output signal in which all working channel
powers are nominally equal or are set for a required level of pre-emphasis
Note 1 to entry: A DCE may also provide the extinction of one or more of the input channels.
3.3.2
channel non-uniformity
difference between the powers of the channel with the most power (in dBm) and the channel
with the least power (in dBm)
Note 1 to entry: The channel non-uniformity applies to a multichannel signal across the operating wavelength range.
Note 2 to entry: Channel non-uniformity is expressed in dB.
3.3.3
in-band extinction ratio
difference, within the operating wavelength range, between the minimum power of the non-
extinguished channels (in dBm) and the maximum power of the extinguished channels (in dBm)
Note 1 to entry: In-band extinction ratio is expressed in dB.
3.3.4
out-of-band attenuation
attenuation of channels that fall outside of the operating wavelength range
Note 1 to entry: Out-of-band attenuation is expressed in dB.
3.3.5
ripple
peak-to-peak difference in insertion loss within a channel frequency (or wavelength) range
3.3.6
channel response time
elapsed time it takes a device to transform a channel from a specified initial power level to a
specified final power level desired state, when the resulting output channel non-uniformity
tolerance is met, measured from the time the actuation energy is applied or removed
3.4 Tuneable dispersion compensator (TDC) or dynamic chromatic dispersion
compensator (DCDC) terms and definitions
3.4.1
tuneable dispersion compensator
TDC
dynamic chromatic dispersion compensator
DCDC
two-port in-line device that is capable of transforming, by internal or external automatic control,
an input signal with time-varying dispersion into an output signal in which an output channel
dispersion value is set for a required level of value
3.4.2
insertion loss ripple
maximum peak-to-peak variation of the insertion loss within a channel frequency (or
wavelength) range
– 10 – IEC 62343:2023 © IEC 2023
3.4.3
dispersion tuning time
longest elapsed time it takes a module to change a dispersion setting from an arbitrary initial
dispersion value to a desired final dispersion value, when the resulting dispersion target
tolerance is met
3.5 Dynamic gain tilt equalizer (DGTE) terms and definitions
3.5.1
dynamic spectral equalizer
DSE
two port in-line dynamic module that converts an input signal with time-varying spectral shape
into an output signal in which spectral shape is nominally flat, or is set for a required spectral
shape for pre-emphasis
3.5.2
dynamic gain tilt equalizer
DGTE
dynamic spectral equalizer used in an optical amplifier that converts input signals with time-
varying gain tilt into output signals in which gain tilt is nominally flat, or is set for a required gain
tilt
3.5.3
dynamic gain tilt range
difference between the maximum and minimum deviation of attenuation over operating
wavelength range, to which the dynamic gain tilt equalizer can be set
3.5.4
positive slope type
type of DGTE for which dynamic gain tilt range can be set for positive gain tilt
3.5.5
negative slope type
type of DGTE for which dynamic gain tilt range can be set for negative gain tilt
3.5.6
both slope type
type of DGTE to which dynamic gain tilt range can be set for both positive and negative gain tilt
3.5.7
slope linearity
maximum deviation of attenuation between the spectral shape by dynamic gain tilt equalizer
and linear slope over the operating wavelength range
3.5.8
response time
longest elapsed time it takes a dynamic gain tilt equalizer to
change a gain tilt setting from an arbitrary initial gain tilt value to a desired final gain tilt value,
when the resulting gain tilt target tolerance is met
3.6 Optical channel monitor (OCM) terms and definitions
3.6.1
input channel plan
entire set of ITU channels on which the optical channel monitor is reporting
3.6.2
input channel frequency spacing tolerance
centre-to-centre difference in frequency (or wavelength) between adjacent channels in a device
3.6.3
input channel power dynamic range
full range of input power per channel between the saturation and sensitivity limits
3.6.4
input channel non-uniformity
difference between the powers of the channel with the most power (in dBm) and the channel
with the least power (in dBm) during one measurement within the response time
Note 1 to entry: Input channel non-uniformity applies to a multichannel signal across the operating wavelength
range.
Note 2 to entry: Input channel non-uniformity is expressed in dB.
3.6.5
input adjacent channel non-uniformity
difference between the powers of adjacent channels present during one measurement within
the response time
Note 1 to entry: The input adjacent channel non-uniformity applies to a multichannel signal across the operating
wavelength range.
Note 2 to entry: In-band extinction ratio is expressed in dB.
3.6.6
input channel non-uniformity for channel identification
difference between the powers of the channel with the most power and the channel with the
least power during one measurement within the response time for positively identifying all
channels present and not falsely identifying channels that are not present
Note 1 to entry: Input channel non-unformity for channel identification applies to a multichannel signal across the
operating wavelength range.
Note 2 to entry: In-band extinction ratio is expressed in dB.
3.6.7
input adjacent channel non-uniformity for channel identification
difference between the powers of adjacent channels present during one measurement within
the response time for positively identifying all channels present and not falsely identifying
channels that are not present
Note 1 to entry: Input adjacent channel non-uniformity for channel identification applies to a multichannel signal
across the operating wavelength range.
Note 2 to entry: In-band extinction ratio is expressed in dB.
3.6.8
input total band power dynamic range for channel measurements
full range of input total band power between the saturation or sensitivity limits of channel
measurements
3.6.9
input total band power dynamic range for total band power measurements
full range of input total band power between the saturation or sensitivity limits of total band
power measurements
– 12 – IEC 62343:2023 © IEC 2023
3.6.10
input optical signal-noise ratio (OSNR) dynamic range
full range of input OSNR per channel within which the power, total band power and OSNR
measurements remain within their respectively specified error limits
3.6.11
input channels bit rates
list of bit rates to which any channel may be modulated
3.6.12
reference measurement bandwidth
integration bandwidth of the optical power measurement
3.6.13
noise equivalent bandwidth
integration bandwidth of the optical noise measurement
3.6.14
channel power absolute error
maximum difference between the measured channel power and the calibrated reference
channel power, within the specified measurement integration bandwidth, during one
measurement within the response time, specified over all input and operating ranges
3.6.15
channel power relative error
maximum variation of the channel power absolute error, during one measurement within the
response time, specified over all input and operating ranges
3.6.16
channel power variability
maximum variation of the channel power absolute error over the repeatability time interval at a
given input and operating condition, specified over all input and operating ranges
3.6.17
channel power resolution interval
smallest increment of the reported channel power measurement value
3.6.18
channel power polarization dependent error
maximum power measurement difference over all polarization states at a given input and
operating condition, during one measurement within the response time, specified over all input
and operating ranges
3.6.19
total band power absolute error
difference between the measured total power and the calibrated total power reference, each
integrated over the frequency band, during one measurement within the response time,
specified over all input and operating ranges
3.6.20
total band power relative error
maximum variation of the total band absolute error, during one measurement within the
response time, specified over all input and operating ranges
3.6.21
total band power variability
maximum variation of the total band power absolute error over the repeatability time interval at
given input and operating conditions, specified over all input and operating ranges
3.6.22
total band power resolution interval
smallest increment of the reported total band power measurement value
3.6.23
frequency absolute error
maximum difference between the measured frequency and the calibrated reference frequency,
during one measurement within the response time, specified over all input and operating ranges
3.6.24
frequency relative error
maximum variation of the frequency absolute error, during one measurement within the
response time, specified over all input and operating ranges
3.6.25
frequency variability
maximum variation of the frequency absolute error over the repeatability time interval at given
input and operating conditions, specified over all input and operating ranges
3.6.26
frequency resolution interval
smallest increment of the reported frequency measurement value
3.6.27
frequency polarization dependent error
maximum frequency measurement difference over all polarization states at given input and
operating conditions, during one measurement within the response time, specified over all input
and operating ranges
3.6.28
OSNR absolute error
maximum difference between the measured and the calibrated reference OSNR, during one
measurement within the response time, specified over all input and operating ranges
3.6.29
OSNR relative error
maximum variation of the OSNR absolute error, during one measurement within the response
time, specified over all input and operating ranges
3.6.30
OSNR variability
maximum variation of the OSNR absolute error over the repeatability time interval at given input
and operating conditions, specified over all input and operating ranges
3.6.31
OSNR resolution interval
smallest increment of the reported OSNR measurement value
3.6.32
OSNR polarization dependent error
maximum OSNR measurement difference over all polarization states at given input and
operating conditions, during one measurement within the response time, specified over all input
and operating ranges
3.6.33
back reflection
fraction of the optical signal reflected at the input optical port over the entire band, specified
over all input and operating ranges
– 14 – IEC 62343:2023 © IEC 2023
3.6.34
response time
time required to perform the specified measurements for all channels
and transfer these values over the communications interface to the external controller that
issues a measurement request, specified over all input and operating ranges
3.6.35
repeatability time interval
minimum time interval over which a given measurement repeatability is performed
3.7 Wavelength selective switch (WSS) terms and definitions
3.7.1
wavelength selective switch
WSS
dynamic module with one or more input ports and one or more output ports, which is mainly
used in a reconfigurable optical add drop multiplexer (ROADM) system to switch each
wavelength signal on each input port independently to its required output port in dense
wavelength division multiplexing (DWDM) networks
Note 1 to entry: A WSS is electrically controlled with software.
Note 2 to entry: Optical paths through the WSS operate bi-directionally, thus ports can be configured as either input
or output ports.
Note 3 to entry: Each wavelength signal can be independently attenuated.
[SOURCE: IEC 62343-4-1:2016, 3.1.1, modified – Note 2 to entry has been replaced by a new
note.]
3.7.2
insertion loss
IL
value of the reduction in optical power at a particular wavelength between the two conducting
ports
Note 1 to entry: The insertion loss is the reduction in optical power between an input and output port of a module
expressed in decibels.
IL = –10 log (P /P )
10 out in
where
P is the optical power launched into input port;
in
P is the optical power received from the output port.
out
3.7.3
insertion loss uniformity
difference between the maximum and minimum insertion loss at the output for a specified set
of input ports
3.7.4
insertion loss ripple
maximum peak-to-peak variation of the insertion loss within a channel frequency (or
wavelength) range
3.7.5
X-dB passband width
width of a channel centred about the channel central wavelength within which the optical
attenuation is within X dB
Note 1 to entry: The terms "operating wavelength range" or "channel passband" are used and have the same
meaning as "passband" for DWDM devices. The X-dB bandwidth is defined through the spectral dependence of a
ij
(where i ≠ j) as the minimum wavelength range centred about the operating wavelength λ within which the variation
h
of a is less than X dB. The minimum wavelength range is determined considering thermal wavelength shift,
ij
polarization dependence and long-term aging shift (refer to Figure 1).
Note 2 to entry: It is recommended that the passband width be specified as 0,5 dB, 1 dB and 3 dB (X = 0,5, 1 and
3).
Figure 1 – Illustration of X-dB bandwidth
3.7.6
return loss
RL
fraction of input power that is returned from any port of a module expressed in decibels and
defined in the following formula at the particular wavelength between two conducting ports:
RL = –10 log (P /P )
10 refl in
where
P is the optical power launched into port;
in
P is the optical power received back from the same port
refl
Note 1 to entry: The module can be a wavelength selective switch or an optical multicast switch.
3.7.7
adjacent channel crosstalk
crosstalk restricted to the channels immediately adjacent to the (channel) wavelength number
associated with output port
Note 1 to entry: Adjacent channel crosstalk is a negative value in dB (see Figure 2).
Note 2 to entry: The adjacent channel crosstalk is different from adjacent channel isolation. In Figure 2, an up
pointing arrow shows positive, a down-pointing arrow negative. Generally, there are two adjacent channel crosstalks
for the shorter wavelength (higher frequency) side and a longer wavelength (lower frequency) side.
– 16 – IEC 62343:2023 © IEC 2023
Note 3 to entry: The terms "crosstalk" and "isolation" are often used with almost the same meaning. However, care
should be taken not to confuse crosstalk and isolation. Crosstalk is defined so that, for wavelength selective
branching devices, the value of the ratio between the optical power of the specified signal and the specified noise is
a negative value in dB. The crosstalk is defined for each output port. Crosstalk for wavelength selective branching
devices is defined for a DEMUX (1 × N × wavelength division multiplexing (WDM) device). The crosstalk for port o to
port j is the subtraction from the insertion loss of port i to o (conducting port pair) to the isolation of port j to o (isolated
port pair). For wavelength selective branching devices having three or more ports, the crosstalk should be specified
as the maximum value of the crosstalk for each output port in dB.
3.7.8
adjacent channel isolation
isolation restricted to the channels immediately adjacent to the (channel) wavelength number
associated with output port
Note 1 to entry: Adjacent channel isolation is a positive value in dB (see Figure 2).
Note 2 to entry: The adjacent channel isolation is different from adjacent channel crosstalk. In Figure 2, an up
pointing arrow shows positive, a down-pointing arrow negative. Generally, there are two adjacent channel isolations
for the shorter wavelength (higher frequency) side and a longer wavelength (lower frequency) side.
Note 3 to entry: The terms "crosstalk" and "isolation" are often used with almost the same meaning. However, care
should be taken not to confuse crosstalk and isolation. Isolation is the minimum value of a (where i ≠ j) within
ij
isolation wavelength range for isolated port pair. Isolation is positive value in dB.
Figure 2 – Illustration of adjacent channel crosstalk and adjacent channel isolation
3.7.9
non-adjacent channel crosstalk
crosstalk restricted to each of the channels not immediately adjacent to the channel associated
with output port
Note 1 to entry: Non-adjacent channel crosstalk is different from non-adjacent channel isolation. In Figure 3, up-
pointing arrow shows positive, down-pointing arrow negative.
3.7.10
non-adjacent channel isolation
isolation restricted to each of the channels not immediately adjacent to the channel associated
with output port
Note 1 to entry: The non-adjacent channel isolation is different from non-adjacent channel crosstalk. In Figure 3,
up-pointing arrow shows positive, down-pointing arrow negative.
Figure 3 – Illustration of non-adjacent channel crosstalk
3.7.11
total channel crosstalk
total channel isolation
cumulative isolation due to the contributions at all the isolation wavelengths (frequencies) and
transfer matrix coefficient for ports i and j, t for any two ports i and j (where i ≠ j)
ij
Note 1 to entry: The total channel crosstalk is the ratio defined as
t(λ)
i j h
XT =−×10 log
tot 10
N
t(λ)
i j k
∑
k (k≠h )
where
N is the number of channels of the device;
λ is the nominal operating wavelength (frequency) for the two of ports, i and j;
h
λ are the nominal isolation wavelengths (frequencies) for the same pair of ports.
k
Note 2 to entry: Total channel crosstalk is also expressed by total channel isolation as in the following formula:
– 18 – IEC 62343:2023 © IEC 2023
XT a λI−
( )
tot ij h tot
Note 3 to entry: Total channel crosstalk is a negative value in dB. For a WDM device, total channel crosstalk shall
be specified as the maximum value of total channel crosstalk of all channels.
3.7.12
transient crosstalk
transient isolation
transient directivity
crosstalk that is attributed to both channel crosstalk (due to same wavelength and/or other
wavelengths) and port isolation, predicted to change during switching operation in WSS module
Note 1 to entry: Hitless operation means that there is no influence on other performance during switching operation.
3.7.13
channel blocking attenuation
attenuation value when a particular channel is set in the blocking state (possible maximum
attenuation)
3.7.14
attenuation without power
attenuation value when electric power for driving the attenuation is not supplied
3.7.15
variable attenuation range
attenuation value that can be changed with channel-by-channel independently controlled by
driving circuit with software
3.7.16
variable attenuation resolution
resolution of the setting of attenuation value
3.7.17
attenuation accuracy
precision of attenuation value once set by driving circuit with software and includes the point of
view of both repeatability and stability in the timeframe
Note 1 to entry: The attenuation accuracy is important when used in open loop operation.
3.7.18
response time for attenuation
elapsed time to change the attenuation value of any channel from an initial valu
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