SIST EN 61300-3-29:2014

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01-september-2014
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Fibre optic interconnecting devices and passive components - Basic test and
measurement procedures - Part 3-29: Examinations and measurements - Spectral
transfer characteristics of DWDM devices
Lichtwellenleiter - Verbindungselemente und passive Bauteile - Grundlegende Prüf- und
Messverfahren - Teil 3-29: Untersuchungen und Messungen - Spektrale
Übertragungsfunktion von DWDM-Bauteilen
Dispositifs d'interconnexion et composants passifs à fibres optiques - Méthodes
fondamentales d'essais et de mesures - Partie 3-29: Examens et mesures -
Caractéristiques de transfert spectral des dispositifs DWDM
Ta slovenski standard je istoveten z: EN 61300-3-29:2014
ICS:
33.180.20 3RYH]RYDOQHQDSUDYH]D Fibre optic interconnecting
RSWLþQDYODNQD devices
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN 61300-3-29

NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2014
ICS 33.180.20 Supersedes EN 61300-3-29:2006
English Version
Fibre optic interconnecting devices and passive components -
Basic test and measurement procedures - Part 3-29:
Examinations and measurements - Spectral transfer
characteristics of DWDM devices
(IEC 61300-3-29:2014)
Dispositifs d'interconnexion et composants passifs à fibres Lichtwellenleiter - Verbindungselemente und passive
optiques - Procédures fondamentales d'essais et de Bauteile - Grundlegende Prüf- und Messverfahren - Teil 3-
mesures - Partie 3-29: Examens et mesures - 29: Untersuchungen und Messungen - Spektrale
Caractéristiques de transfert spectral des dispositifs DWDM Übertragungsfunktion von DWDM-Bauteilen
(CEI 61300-3-29:2014) (IEC 61300-3-29:2014)
This European Standard was approved by CENELEC on 2014-04-23. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2014 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 61300-3-29:2014 E
Foreword
The text of document 86B/3718/FDIS, future edition 2 of IEC 61300-3-29, prepared by SC 86B "Fibre
optic interconnecting devices and passive components" of IEC/TC 86 "Fibre optics" was submitted to
the IEC-CENELEC parallel vote and approved by CENELEC as EN 61300-3-29:2014.
The following dates are fixed:
– latest date by which the document has to be implemented at (dop) 2015-01-23
national level by publication of an identical national
standard or by endorsement
– latest date by which the national standards conflicting with (dow) 2015-04-23
the document have to be withdrawn

This document supersedes EN 61300-3-29:2006.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such
patent rights.
Endorsement notice
The text of the International Standard IEC 61300-3-29:2014 was approved by CENELEC as a
European Standard without any modification.

- 3 - EN 61300-3-29:2014
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is
available here: www.cenelec.eu.

Publication Year Title EN/HD Year
IEC 60050-731 -  International Electrotechnical Vocabulary (IEV) - -
Chapter 731: Optical fibre communication
IEC 61300-3-2 -  Fibre optic interconnecting devices and passive EN 61300-3-2 -
components - Basic test and measurement
procedures
Part 3-2: Examinations and measurements -
Polarization dependent loss in a single-mode
fibre optic device
IEC 61300-3-7 -  Fibre optic interconnecting devices and passive EN 61300-3-7 -
components - Basic test and measurement
procedures
Part 3-7: Examinations and measurements -
Wavelength dependence of attenuation and
return loss of single mode components
IEC 62074-1 -  Fibre optic interconnecting devices and passive EN 62074-1 -
components - Fibre optic WDM devices
Part 1: Generic specification
IEC 61300-3-29 ®
Edition 2.0 2014-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Fibre optic interconnecting devices and passive components – Basic test and

measurement procedures –
Part 3-29: Examinations and measurements – Spectral transfer characteristics

of DWDM devices
Dispositifs d’interconnexion et composants passifs à fibres optiques –

Procédures fondamentales d’essais et de mesures –

Partie 3-29: Examens et mesures – Caractéristiques de transfert spectral des

dispositifs DWDM
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX W
ICS 33.180.20 ISBN 978-2-8322-1479-4

– 2 – IEC 61300-3-29:2014 © IEC 2014
CONTENTS
FOREWORD . 5
1 Scope . 7
2 Normative references . 7
3 Terms, definitions, abbreviations and symbols . 7
3.1 Terms and definitions . 7
3.2 Symbols and abbreviations . 8
3.2.1 Symbols . 8
3.2.2 Abbreviations . 8
4 General description . 9
5 Apparatus . 10
5.1 Measurement set-up . 10
5.2 Light source, S . 12
5.2.1 Tuneable narrowband light source (TNLS) – Method A . 12
5.2.2 Broadband source (BBS) – Method B . 12
5.3 Tracking filter (TF) . 12
5.4 Reference branching device (RBD) . 12
5.5 Wavelength meter (WM) . 13
5.6 Polarizer (PL). 13
5.7 Polarization controller (PC) . 13
5.8 Device under test (DUT) . 13
5.8.1 General . 13
5.8.2 Device input/output optics . 14
5.9 Detector (D) . 14
5.9.1 Broadband detectors, BBD1, BBD2, Method A.1 . 14
5.9.2 Tuneable narrowband detector (TND) – Method A.2 and
Method B . 14
5.10 Temporary joints (TJ) . 15
6 Procedure . 15
6.1 General . 15
6.2 Preparation of DUTs . 15
6.3 System initialization . 15
6.4 System reference measurement . 16
6.4.1 General . 16
6.4.2 Measurement of the reference spectra for Method A . 16
6.4.3 Measurement of reference spectra for Method B . 16
6.5 Measurement of device spectra . 16
7 Characterization of the device under test . 17
7.1 Determination of transfer functions . 17
7.1.1 General . 17
7.1.2 Accounting for the source variations . 17
7.1.3 Calculations for the Mueller matrix method . 17
7.2 Transmission (T(λ)) spectra measurements . 18
7.2.1 General . 18
7.2.2 Peak power calculation . 19

IEC 61300-3-29:2014 © IEC 2014 – 3 –
7.2.3 Normalization of the transfer function . 20
7.3 Calculation of optical attenuation (A) . 20
7.4 Insertion loss (IL) . 20
7.5 Bandwidth and full spectral width . 21
7.5.1 General . 21
7.5.2 Centre wavelength . 21
7.5.3 Centre wavelength deviation . 22
7.5.4 X dB bandwidth . 22
7.6 Passband ripple . 22
7.7 Isolation (I) and crosstalk (XT) . 23
7.7.1 General . 23
7.7.2 Channel isolation . 24
7.7.3 Channel crosstalk . 24
7.7.4 Adjacent channel isolation . 24
7.7.5 Adjacent channel crosstalk . 25
7.7.6 Minimum adjacent channel isolation . 25
7.7.7 Maximum adjacent channel crosstalk . 25
7.7.8 Non-adjacent channel isolation . 25
7.7.9 Non-adjacent channel crosstalk . 26
7.7.10 Minimum non-adjacent channel isolation . 26
7.7.11 Maximum non-adjacent channel crosstalk . 26
7.7.12 Total channel isolation . 26
7.7.13 Total channel crosstalk . 26
7.7.14 Minimum total channel isolation . 26
7.7.15 Maximum total channel crosstalk . 26
7.8 Polarization dependent loss (PDL(λ)) . 27
7.9 Polarization dependent centre wavelength (PDCW) . 27
7.10 Channel non-uniformity . 28
7.11 Out-of-band attenuation . 28
8 Details to be specified . 28
8.1 Light source (S) . 28
8.1.1 Tuneable narrowband light source (TNLS) . 28
8.1.2 Broadband source (BBS) (unpolarized) . 28
8.2 Polarization controller (PC) . 29
8.3 Polarizer (PL). 29
8.4 Tracking filter (TF) . 29
8.5 Reference branching device (RBD) . 29
8.6 Temporary joint (TJ) . 29
8.7 Wavelength meter (WM) . 29
8.8 Detector (D) . 29
8.8.1 Broadband detector (BBD) . 29
8.8.2 Tuneable narrowband detector (TNBD) . 29
8.9 DUT . 30
Annex A (informative) Reflection spectrum measurements . 31
A.1 General . 31
A.2 Apparatus . 31
A.2.1 General . 31
A.2.2 Reference branching device . 31

– 4 – IEC 61300-3-29:2014 © IEC 2014
A.2.3 Optical termination . 32
A.3 Measurement procedure . 32
A.3.1 General . 32
A.3.2 Determination of source reference spectrum . 32
A.3.3 Determination of system constant . 32
A.3.4 Determination of reference reflectance spectrum . 33
A.3.5 Determination of device reflectance spectrum . 33
A.3.6 Determination of optical attenuation . 33
A.4 Reflection [R(λ)] spectra measurements . 34
Annex B (informative) Determination of the wavelength increment parameter . 35
Annex C (informative) Determination of a mean value using the shorth function . 37
Bibliography . 39

Figure 1 – Basic measurement set-up . 10
Figure 2 – Measurement set-up for tuneable narrowband light source (TNLS) system . 11
Figure 3 – Measurement set-up for TNLS and tuneable narrowband detector (TND)
system . 11
Figure 4 – Measurement set-up for BBS and tuneable narrowband detector (TND)
system . 11
Figure 5 – System reference for transmission measurement . 16
Figure 6 – Normalized transfer functions . 19
Figure 7 – BW and full spectral width for a fibre Bragg grating . 21
Figure 8 – X dB bandwidth . 22
Figure 9 – Passband ripple . 23
Figure 10 – Channel isolation and crosstalk . 24
Figure 11 – Minimum adjacent channel isolation . 25
Figure 12 – Polarization dependence of the transfer function . 27
Figure 13 – Polarization dependent centre wavelength (PDCW) . 28
Figure A.1 – Measurement set-up for a single port device . 31
Figure A.2 – Source reference set-up . 32
Figure A.3 – Set-up for measurement of system constant . 33
Figure C.1 – Example response and –x dB wavelengths . 37
Figure C.2 – Example showing the –0,5 dB wavelengths based on the shorth (dotted
vertical lines) and the mean (solid vertical lines) . 38

Table 1 – Test methods . 10

IEC 61300-3-29:2014 © IEC 2014 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIBRE OPTIC INTERCONNECTING
DEVICES AND PASSIVE COMPONENTS –
BASIC TEST AND MEASUREMENT PROCEDURES –

Part 3-29: Examinations and measurements –
Spectral transfer characteristics of DWDM devices

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.
International Standard IEC 61300-3-29 has been prepared by sub-committee 86B: Fibre optic
interconnecting devices and passive components, of IEC technical committee 86: Fibre optics.
This second edition cancels and replaces the first edition published in 2005. It constitutes a
technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
– terms and definitions have been added and reconsidered in order to be harmonized with
IEC 62074-1;
– characterizations of the device under test have been reviewed;

– 6 – IEC 61300-3-29:2014 © IEC 2014
– details to be specified have been reconsidered.
The text of this standard is based on the following documents:
FDIS Report on voting
86B/3718/FDIS 86B/3758/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The list of all parts of IEC 61300 series, published under the general title, Fibre optic
interconnecting devices and passive components – Basic test and measurement procedures,
can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication 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.
IEC 61300-3-29:2014 © IEC 2014 – 7 –
FIBRE OPTIC INTERCONNECTING
DEVICES AND PASSIVE COMPONENTS –
BASIC TEST AND MEASUREMENT PROCEDURES –

Part 3-29: Examinations and measurements –
Spectral transfer characteristics of DWDM devices

1 Scope
This part of IEC 61300 identifies two basic measurement methods for characterizing the
spectral transfer functions of DWDM devices.
The transfer functions are the functions of transmittance dependent of wavelengths. In this
standard, optical attenuations are also used.
NOTE In this standard, transfer functions are expressed by T(λ) and optical attenuations are expressed by A(λ).
The transfer functions can be used to produce measurements of insertion loss (IL),
polarization dependent loss (PDL), isolation, centre wavelength, bandwidth (BW) and other
optical performances.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. 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
IEC 61300-3-2, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 3-2: Examinations and measurements – Polarization
dependent loss in a single-mode fibre optic device
IEC 61300-3-7, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 3-7: Examinations and measurements – Wavelength
dependence of attenuation and return loss of single mode components
IEC 62074-1, Fibre optic interconnecting devices and passive components – Fibre optic WDM
devices – Part 1: generic specification
3 Terms, definitions, abbreviations and symbols
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-731, as well
as the following, apply.
– 8 – IEC 61300-3-29:2014 © IEC 2014
3.1.1
bandwidth
(linewidth)
BW
spectral width of a signal or filter
Note 1 to entry: In the case of a laser signal such as a tuneable narrowband light source, the term 'linewidth' is
commonly preferred. Often defined by the width at a set power distance from the peak power level of the device
(i.e. 3 dB BW or 1 dB BW). The bandwidth shall be defined as the distance between the closest crossings on either
side of the centre wavelength in those cases where the spectral shape has more than 2 such points. The distance
between the outermost crossings can be considered the full spectral width.
3.1.2
channel frequency range
(passband)
CFR
specified range of wavelengths (frequencies) from λ (f ) to λ (f ), centred about
hmin hmin hmax hmax
the nominal operating wavelength frequency), within which a WDM device operates to
transmit less than or equal to the specified optical attenuation
Note 1 to entry: Passband is commonly used to convey the same meaning.
3.1.3
dense WDM
DWDM
WDM device intended to operate for channel spacing equal to or less than 1 000 GHz
3.1.4
polarization dependent loss
PDL
maximum variation of insertion loss due to a variation of the state of polarization (SOP) over
all SOP
3.1.5
state of polarization
SOP
distribution of light energy among the two linearly independent solutions of the wave
equations for the electric field
3.1.6
source spontaneous emission
SSE
broadband emissions from a laser cavity that bear no phase relation to the cavity field
Note 1 to entry: These emissions can be seen as the baseline noise on an optical spectrum analyser (OSA)
3.1.7
wavelengths division multiplexer
WDM
term frequently used as a synonym for a wavelength-selective branching device
3.2 Symbols and abbreviations
3.2.1 Symbols
δ wavelength sampling increment during the measurement
λ centre channel or nominal operating wavelength for a component
h
3.2.2 Abbreviations
APC angled physical contact
ASE amplified spontaneous emission

IEC 61300-3-29:2014 © IEC 2014 – 9 –
BBD broadband detector
BBS broadband light source
BW bandwidth
CFR channel frequency range
DOP  degree of polarization
DUT  device under test
DWDM dense wavelengths division multiplexer
FBG fibre Bragg grating
IL insertion loss
OPM optical power meter
OSA optical spectrum analyser
PC polarization controller
PC physical contact
PDCW polarization dependent centre wavelength
PDL polarization dependent loss
PSCS polarization state change system
PL polarizer
RBD reference branching devices
S light source
SD standard deviation
SOP state of polarization
SSE source spontaneous emission
TF tracking filter
TJ temporary joint
TLS tuneable laser source.
TND tuneable narrowband detector
TNLS tuneable narrowband light source
WDL wavelength dependent loss
WDM wavelength division multiplexer
WM wavelength meter
4 General description
This standard is complementary to the wavelength dependence of attenuation, and return loss
(IEC 61300-3-7), and polarization dependence of attenuation (IEC 61300-3-2) for DWDM
devices which channel spacing is less than or equal to 1 000 GHz (8 nm at the wavelength
band of 1 550 nm).
The transfer functions can be used to produce measurements of following performance
parameters:
– insertion loss (IL);
– centre wavelength and centre wavelength deviation;
– X dB bandwidth;
– passband ripple;
– isolation;
– 10 – IEC 61300-3-29:2014 © IEC 2014
– crosstalk;
– polarization dependent loss (PDL) and polarization dependent centre wavelength
(PDCW) ;
– channel non-uniformity;
– out-of-band attenuation.
In general, the DWDM devices have channel bandwidths less than 1 nm, filter response
slopes greater than 100 dB/nm, and out-of-band rejection extending over tens of nm.
The methods described in this standard will show how to obtain the transfer function from a
single input to a single output port (single conducting path). For an M x N device, it will be
required to repeat this procedure using all possible combinations of input and output ports.
The methods described in this standard are intended to be applicable to any wavelength band
(C, L, S, O, etc.) although examples may be shown in the C-band for illustrative purposes.
The two methods contained in this standard differ mainly in the way in which the wavelength
resolution is obtained. Method A uses a tuneable narrowband light source, while Method B
used a broadband light source. Method A has two branching methods; Method A.1 and
Method A.2. These three measurement methods are summarized in Table 1. Method A.2 shall
be considered the reference test method for DWDM devices.
Table 1 – Test methods
Method Names Source Detector Examples Remarks
A.1 TNLS in sweep TNLS in sweep mode BBD TNLS + DUT + OPM Alternative
mode + BBD
A.2 TNLS in sweep TNLS in sweep mode TND TNLS + DUT + OSA Reference
mode + TND
B BBS + TND BBS TND BBS + DUT + OSA Alternative

This standard also includes annexes that illustrate the following:
Annex A: Reflection spectrum measurements;
Annex B: Determination of wavelength increment parameter;
Annex C: Determination of a mean value using the shorth function.
5 Apparatus
5.1 Measurement set-up
The basic measurement set-up for the characterization of DWDM devices is shown in Figure 1
below.
TJ2
TJ1
S PL PC DUT D
IEC  0959/14
Figure 1 – Basic measurement set-up
This procedure contains three methods that differ fundamentally in the way in which the
wavelength resolution is achieved. There are three key influences on the wavelength

IEC 61300-3-29:2014 © IEC 2014 – 11 –
resolution: the linewidth of the source or bandwidth of the tuneable narrowband detector, the
analogue bandwidth of the detection system and the rate of change of wavelength.
Having determined the wavelength resolution of the measurement, the wavelength sampling
increment (δ) should be less than half the bandwidth of the system in order to accurately
measure the average value of the optical attenuation.
The bandwidth of the system is determined by the convolution of the effective source
bandwidth with the rate of change of wavelength over the time constant of the detector.
Practical constraints may result in smaller or larger bandwidths than recommended. Two
cautions should be noted with smaller bandwidths: first, coherent interference effects can lead
to additional measurement errors, and second, under-sampling of the device could lead to
misrepresentations of the reconstructed transfer function. If larger bandwidths are used, the
reconstructed transfer function could smear out fine structures and distort response slopes.
As the response slopes may exceed 100 dB/nm, small uncertainties in wavelength may result
in large amplitude response errors. In general, the resolution bandwidth of the system needs
to be chosen based on the device characteristics and noted in the details to be specified.
As explained in Table 1, there are three measurement methods. Figures 2, 3, and 4 show the
typical set-ups for Methods A.1, A.2 and B.
TJ2
TJ1 DUT
BBD1
PC RBD
TLS TF RBD
BBD2
WM
IEC  0960/14
Figure 2 – Measurement set-up for tuneable narrowband light source (TNLS) system

TJ2
TJ1
DUT
TNLS PC TND
IEC  0961/14
Figure 3 – Measurement set-up for TNLS and tuneable narrowband detector (TND)
system
TJ2
TJ1
BBS
DUT
PL PC TND
(unpolarized)
IEC  0962/14
Figure 4 – Measurement set-up for BBS and tuneable narrowband detector
(TND) system
– 12 – IEC 61300-3-29:2014 © IEC 2014
5.2 Light source, S
5.2.1 Tuneable narrowband light source (TNLS) – Method A
This method uses a polarized tuneable narrowband light source (TNLS) that can select a
specific output wavelength and can be tuned across a specified wavelength range. The
“source” could also include a tracking filter, reference branching device (RBD), and
wavelength monitor as shown in Figure 2. These additions are optional as they relate to the
measurement requirements and the TLS specifications.
The power stability at any of the operating wavelengths shall be less than ±0,01 dB over the
measuring period. This stability can be obtained using the optional detector BBD2 in Figure 2
as a reference detector. If BBD2 is synchronized with BBD1, then the variations in power can
be cancelled. It should be noted that the dynamic response of the two power meters should
have the same electrical bandwidth. The output power of the TLS shall be sufficient to provide
the apparatus with an order of magnitude range more dynamic than the device exhibits (i.e.
the measurement apparatus should be able to measure a 50 dB notch if the device is a 40 dB
notch filter).
The wavelength uncertainty of the TLS shall be approximately an order of magnitude smaller
than the step size for each point in the measuring range. This uncertainty may be obtained by
having the wavelength monitor feedback to the TLS. The tuning range of the TLS shall cover
the entire spectral region of the DWDM device and the source shall also be free of mode
hopping over that tuning range.
The side mode suppression ratio and the SSE of the TLS should be sufficient to provide a
signal to noise ratio one order of magnitude greater than is required for the measurement, or
the use of a tracking filter shall be required for notch filter measurements. The SSE can be
measured on an optical spectrum analyser using a 0,1 nm resolution bandwidth. The
measured points should be taken at half the distance between possible DWDM channels (i.e.
at 50 GHz from the centre frequency for a 100 GHz DWDM device). As an example, if the
system needs to measure 50 dB of attenuation, the SSE should be –60 dB.
5.2.2 Broadband source (BBS) – Method B
This method uses an unpolarized broadband light source such as an LED or an amplified
spontaneous emission (ASE) source. The source spectrum shall provide sufficient optical
power over the full wavelength range of the DUT. This factor is especially important in the
measurement of notch filters where the dynamic resolution of the system needs to be high
(typically >50 dB) for accurate measurements.
The optical power of the light source shall either be stable over the duration of the test or
normalized in a wavelength-specific fashion by means of a reference path (possibly consisting
of a RBD and a synchronized TND).
5.3 Tracking filter (TF)
The tracking filter is required if the dynamic range of the TLS and the detector does not allow
for measuring a depth of at least 10 dB greater than required due to the shape of the DUT
and the broadband SSE of the TLS. The filter shall track the TLS so as to provide the
maximum SSE suppression and the maximum transmitted power as the TLS is scanned
across the measurement region. It should be noted that the spectral shape of the filter will
affect the effective linewidth of the system.
5.4 Reference branching device (RBD)
The configuration of the RBD is 1 × 2 or 2 × 2. If its configuration is 2 × 2, one port of the RBD
shall be terminated to have a back reflection of less than –50 dB. The splitting ratio of the
RBD shall be stable with wavelength. It shall also be insensitive to polarization. The
polarization sensitivity of transmission attenuation shall be less than one-tenth of the

IEC 61300-3-29:2014 © IEC 2014 – 13 –
wavelength dependency of attenuation to be measured. The polarization mode dispersion of
the RBD shall be less than one half of the coherence time of the source so as not to
depolarize the input signal. The split ratio shall be sufficient to provide the dynamic range for
the measurement of the transfer function and the power necessary for the wavelength meter
to operate correctly.
5.5 Wavelength meter (WM)
In this test procedure, the wavelength uncertainty of the source needs to be extremely small
and closely monitored. If the tuning uncertainty of the TLS is not sufficient for the
measurement, the wavelength monitor shall be required. For this measurement method it is
necessary to measure the spectral peak of any input signal within the device bandwidth to an
uncertainty approximately one order of magnitude greater than the step size. Therefore,
acceptable wavelength monitors include an optical wavelength meter or a gas absorption cell
(such as an acetylene cell). If a gas absorption cell is used, the wavelength uncertainty of the
TLS shall be sufficient to resolve the absorption lines.
Regarding the wavelength repeatability of the TLS and the monitor, it should be understood
that if the test apparatus has 0,1 dB of ripple with a 30 pm period, then a random 3 pm
wavelength variation from reference scan to device scan can result in as much as 0,03 dB of
attenuation error.
5.6 Polarizer (PL)
For the BBS method (Method B), the polarizer shall be put after the BBS. A polarization
extinction ratio of polarizer shall be more than or equal to 20 dB.
5.7 Polarization controller (PC)
The polarization controller is used to control the input state of polarization (SOP). The details
of polarization controller are defined as PSCS in IEC 61300-3-2. That standard defines two
types of PSCS, for all polarization methods and the Mueller matrix method. In the event of a
polarization dependent measurement, the controller will be used to generate four known
polarization states for testing purposes. The states shall be distinct and well known in order to
achieve accurate PDL measurements. The return loss on the input to the controller shall be
greater than 50 dB, so as not to return any polarized light back to the TLS cavity for Method A.
This may also be achieved using an isolator to protect the TLS.
5.8 Device under test (DUT)
5.8.1 General
The device under test shall be DWDM devices. For the purposes of this standard, the test
ports shall be a single “input-output” path. The method described herein can be extrapolated
upon to obtain a single measurement system capable of handling even an M x N DWDM
device. It is noted that these measurements are very sensitive to reflections, and that
precautions shall be taken to ensure that reflection cavities are not introduced in the test set-
up.
In many cases, the characteristics of DWDM devices are temperature dependent. This
measurement procedure assumes that any such device is held at a constant temperature
throughout the procedure. The absolute uncertainty of the measurement may be limited by the
uncertainty of any heating or cooling device used to maintain a constant temperature. For
example, if a device is known to have a temperature dependence of 0,01 nm/°C, and the
temperature during the procedure is held to a set temperature ± 1 °C; then any spectral
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