IEC 62343-5-1:2009

IEC 62343-5-1 ®
Edition 1.0 2009-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Dynamic modules – Test methods –
Part 5-1: Dynamic gain tilt equalizer – Response time measurement

Modules dynamiques – Méthodes d’essai –
Partie 5-1: Egaliseur dynamique de basculement de gain – Mesure du temps
de réponse
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IEC 62343-5-1 ®
Edition 1.0 2009-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Dynamic modules – Test methods –

Part 5-1: Dynamic gain tilt equalizer – Response time measurement

Modules dynamiques – Méthodes d’essai –

Partie 5-1: Egaliseur dynamique de basculement de gain – Mesure du temps

de réponse
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX R
ICS 33.180.01; 33.180.99 ISBN 978-2-8891-0679-0

– 2 – IEC 62343-5-1:2009 © IEC 2009
CONTENTS
FOREWORD . 4
1 Scope and general information . 6
2 Terms, definitions, abbreviations and response waveforms . 6
2.1 Terms and definitions . 6
2.2 Abbreviations . 7
2.3 Response waveforms . 7
3 Apparatus . 9
3.1 Light source . 9
3.2 Pulse generator . 9
3.3 O/E converter . 10
3.4 Temperature and humidity chamber . 10
3.5 Oscilloscope . 10
3.6 Temporary joints . 10
3.7 Control system . 10
3.8 Measurement set-up . 10
4 Procedure . 11
4.1 Direct control type . 11
4.1.1 Set-up . 11
4.1.2 Preparation . 12
4.1.3 Wavelength setting . 12
4.1.4 Pulse generator setting . 12
4.1.5 Applying the driving pulse . 12
4.1.6 Monitoring and recording the output signal from DGTE under test
(DUT) . 12
4.1.7 Calculation of the response time . 12
4.2 Digital control type . 12
4.2.1 Set-up . 12
4.2.2 Preparation . 12
4.2.3 Wavelength setting . 12
4.2.4 Sending command . 12
4.2.5 Monitoring and recording the command complete flag . 13
4.2.6 Calculation of the response time . 13
4.3 Analogue control type . 13
4.3.1 Set-up . 13
4.3.2 Preparation . 13
4.3.3 Wavelength setting . 13
4.3.4 Applying the control signal . 13
4.3.5 Monitoring and recording the command complete flag . 13
4.3.6 Calculation of the response time . 13
5 Details to be specified . 14
5.1 Apparatus . 14
5.1.1 Light source. 14
5.1.2 Pulse generator . 14
5.1.3 O/E converter . 14
5.1.4 Control system . 14
5.2 Measurement conditions . 14

Annex A (informative) Convergence criterion . 15
Annex B (informative) Measurement examples . 16
Annex C (informative) Response time for specific DGTEs . 17
Annex D (informative) Necessity for the correction of temperature dependency . 18

Figure 1 – Response waveforms for direct control DGTEs . 8
Figure 2 – Response waveforms for digital control DGTEs . 8
Figure 3 – Response waveforms for analogue control DGTEs . 9
Figure 4 – Measurement set-up for direct control . 10
Figure 5 – Measurement set-up for digital control . 11
Figure 6 – Measurement set-up for analogue control . 11
Figure B.1 – In case of insertion loss change is enough . 16
Figure B.2 – In case of insertion loss change is small . 16

Table 1 – The categorization of DGTE by the control method . 6

– 4 – IEC 62343-5-1:2009 © IEC 2009
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
DYNAMIC MODULES –
TEST METHODS –
Part 5-1: Dynamic gain tilt equalizer –
Response time measurement
FOREWORD
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all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
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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.
International Standard IEC 62343-5-1 has been prepared by subcommittee 86C: Fibre optic
systems and active devices, of IEC technical committee 86: Fibre optics.
This bilingual version (2014-07) corresponds to the English version, published in 2009-06.
The text of this standard is based on the following documents:
FDIS Report on voting
86C/883/FDIS 86C/899/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.
The French version of this standard has not been voted upon.

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts of IEC 62343 series, published under the general title Dynamic modules –
Test methods, can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result 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.
– 6 – IEC 62343-5-1:2009 © IEC 2009
DYNAMIC MODULES –
TEST METHODS –
Part 5-1: Dynamic gain tilt equalizer –
Response time measurement
1 Scope and general information
1.1 Scope
This part of IEC 62343 contains the measurement method of response time for a dynamic
gain tilt equalizer (DGTE) to change its gain tilt from an arbitrary initial value to a desired
target value.
1.2 General information
The DGTE is categorized into three control methods as shown in Table 1. The direct control
type is driven directly by voltage or current, the digital control type is operated by digital
control system with digital signals, and the analogue control type is operated by analogue
signals. The definition and the measurement method of response time for DGTE are different
for the three control types. Table1 also shows the configuration of operating systems and the
correction for temperature dependency for three control types of DGTE. When the response
time for the DGTE has temperature dependency, users may need to calibrate the temperature
effect. The bottom row in Table 1 indicates the typical methods of the correction for
temperature dependency (refer to Annex D).
Table 1 – Categorization of DGTE by the control method

Direct control Digital control Analogue control
Control By voltage or current By command through digital By voltage or current
directly circuit through analogue circuit
Configurations
DGTE DGTE
DGTE
w/digital circuit
w/analogue circuit
V/I applied
Command
V/I control
(RS232c, I2C,
(ex. 0~+5V)
)
Control system
Control system Control system
Correction for By control system By digital circuit or control By analogue circuit or
temperature system control system
dependency
2 Terms, definitions, abbreviations and response waveforms
2.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

2.1.1
convergence time
T
c
time to converge from the first hit at the target ±Y % to the stay within the deviation ±Y % in
the optical power from the output port of DGTE at pre-determined wavelength
2.1.2
latency time
T
l
for the direct and the analogue control types, time between the application of control signal
and the change in optical power by ±X % from the output port of DGTE at pre-determined
wavelength
2.1.3
processing time
T
p
for the digital control type, time between the application of control command and the change
in optical power by ±X % from the output port of DGTE at pre-determined wavelength
2.1.4
response time
(T or T ) + T + T
l p r c
2.1.5
rise time
T
r
time to change from the initial ±X % to the target ±Y % in the optical power from the output
port of DGTE at pre-determined wavelength
2.1.6
setting time
T
s
time to be suppressed from the first hit at the target ±Y % to the final stay at the target within
a required resolution of the optical power from the output port of DGTE at pre-determined
wavelength
2.2 Abbreviations
CPU Central processing unit
DGTE Dynamic gain tilt equalizer
DUT  Device under test
O/E Optical-to-electrical
PDL Polarization dependent loss
TLS Tunable laser source
WDM Wavelength division multiplexing
2.3 Response waveforms
The definitions and symbols defined in 2.1 are shown in Figures 1 through Figure 3.

– 8 – IEC 62343-5-1:2009 © IEC 2009
Optical power (W)
Suppressed within
required resolution
100 + Y %
P
o
Target power 100 %
100 – Y % P
u
Parameters
T : Latency time
l
T : Rise time
r
T : Convergence time
c
Response time: T + T + T
T : Setting time
l r c
s
P : Overshoot
o
P : Undershoot
T
100 + X % u
s
Initial power
100 %
100 – X %
T T T
l
r c
Time
Control signal
Figure 1 – Response waveforms for direct control DGTEs

Optical power (W)
Suppressed within
required resolution
100 + Y %
P
o
Target power
100 %
100 – Y %
P
u
Parameters
T : Latency time
l
T : Rise time
r
T : Convergence time
c
Response time: T + T + T
p r c
T : Setting time
s
P : Overshoot
o
P : Undershoot
100 + X % T u
s
Initial power
100 %
100 – X %
T
p T T
r c
Time
Command
Figure 2 – Response waveforms for digital control DGTEs

Optical power (W)
Suppressed within
required resolution
100 + Y %
P
o
Target power 100 %
100 – Y % P
u
Parameters
T : Latency time
l
T : Rise time
r
T : Convergence time
c
Response time: T + T + T
T : Setting time
l r c
s
P : Overshoot
o
T  P : Undershoot
100 + X %
s u
Initial power
100 %
100 – X %
T T T
l
r c
Time
Control signal
Figure 3 – Response waveforms for analogue control DGTEs
3 Apparatus
3.1 Light source
A tunable wavelength device is used as the light source. A tunable laser source (TLS) or a
combination of a broadband light source and tunable filter is the typical equipment of a
tunable wavelength light source. The tuning range of the tunable wavelength light source shall
be enough to cover the operating wavelength of DGTE to be measured.
In order to minimize the measurement uncertainty caused by the linewidth of the light source,
the linewidth multiplied by the maximum value of the gain tilt slope of DGTE shall be smaller
than one-tenth of the dynamic gain tilt range. Typical values of operating wavelength range
and dynamic gain tilt range of DGTE are 35 nm and ± 4 dB respectively. For example, the
error for the linewidth of 1 nm is calculated as:
4 / 35
(1) )= 1,4 %
(+4− (−4))
The output power of the light source shall remain stable during the measurement. The stability
of the output power during the response time of DGTE to be measured shall be smaller than
one-tenth of dynamic gain tilt range of DGTE.
If polarization dependent loss (PDL) of DGTE to be measured is larger than 0,5 dB, a de-
polarized light source shall be used.
3.2 Pulse generator
A pulse generator is used to drive the DGTE to be measured. The shape of the pulse shall be
rectangular to change the gain tilt. The intensity and width of the pulse shall be such to make
the maximum tilt change defined as the specification of DGTE. The rise time/fall time of the
rectangular pulse shall be shorter than 10 ns or one-tenth of the rise time/fall time to be
measured.
– 10 – IEC 62343-5-1:2009 © IEC 2009
3.3 O/E converter
An O/E converter is used to convert the optical output power of the DGTE to be measured to
the electrical power to be observed by an oscilloscope. The bandwidth of O/E converter shall
be from DC to greater than 10(1/T ) Hz, where T is the rise time to be measured.
r r
The maximum power input to the O/E converter before compression shall be more than 10
times the optical power to be measured.
3.4 Temperature and humidity chamber
The test set-up shall include an environmental chamber capable of producing and maintaining
the specified temperature and/or humidity.
3.5 Oscilloscope
The oscilloscope shall have a storage function and sufficient bandwidth and accuracy. It shall
have at least two traces.
3.6 Temporary joints
This is a method, device, or mechanical fixture for temporarily aligning two fibre ends into a
reproducible, low loss joint. It may be, for example, a precision V-groove vacuum chuck,
micromanipulator or a fusion or mechanical splice. The stability of the temporary joint shall be
compatible with the measurement precision required.
3.7 Control system
For digital and analogue control types, the control system is used to drive the DGTE. The
specification is defined individually.
3.8 Measurement set-up
The measurement set-up for the three control types is shown in Figures 4 to Figure 6.
Chamber
Oscilloscope
O/E
Light source DGTE
converter
Pulse generator
Signal pulse
Figure 4 – Measurement set-up for direct control

Oscilloscope
Chamber
O/E
DGTE
Light source
converter
w/digital circuit
Command complete flag
Command
RS232c
GP-IB
I2C
Dual port RAM
etc.
Command sending flag
Control system
NOTE Either command complete flag or command sending flag can be used.
Figure 5 – Measurement set-up for digital control
Oscilloscope
OscOscililloloscscopopee
Chamber
O/E
DGTE
Light source
converter
w/analog circuit
Voltage
or
current
Command complete flag
Control system
NOTE It should be driven by a step signal from the control system.

Figure 6 – Measurement set-up for analogue control
4 Procedure
4.1 Direct control type
4.1.1 Set-up
The measurement set-up shall be made up as shown in Figure 1. The temperature in the
chamber after setting shall be kept constant and uniform in order to achieve stable
measurement. The light source, the pulse generator, the O/E converter and the oscilloscope
shall be turned on for the measurement.

– 12 – IEC 62343-5-1:2009 © IEC 2009
4.1.2 Preparation
Before starting the measurement, the set-up shall be turned on for more than 1 h for
stabilization.
4.1.3 Wavelength setting
The wavelength of the light source shall be set at the measuring wavelength. Measurement
shall take place at three wavelengths: shortest, medium and longest wavelengths in the
operating wavelength range. An alternative method is to measure the wavelength at the
maximum deviation in insertion loss.
4.1.4 Pulse generator setting
The voltage or current needed to drive from minimum (maximum) tilt to maximum (minimum)
shall be set. The minimum and maximum states of tilt occur when the deviation in insertion
loss takes the maximum value at the shortest or the longest wavelength within the operating
wavelength.
4.1.5 Applying the driving pulse
The driving pulse shall be applied to the DGTE to be measured by the pulse generator.
4.1.6 Monitoring and recording the output signal from DGTE under test (DUT)
The output signal from the O/E converter shall be monitored by the oscilloscope and the data
shall be recorded. In addition, the signal pulse from the pulse generator shall be monitored
and recorded.
4.1.7 Calculation of the response time
After the three wavelengths have been measured, the response time shall be calculated
according to Figure 1. Generally, the response time is defined as the maximum value among
the three response times.
4.2 Digital control type
4.2.1 Set-up
The measurement set-up is shown in Figure 2. The temperature in the chamber after setting
shall be kept constant and uniform for stable measurement. The light source, the digital
control system, the O/E converter and the oscilloscope shall be turned on for the
measurement.
4.2.2 Preparation
Before starting the measurement, the set-up shall be turned on for more than 1 h for
stabilization.
4.2.3 Wavelength setting
The wavelength of the light source shall be set at the measuring wavelength. The
measurement shall take place at three wavelengths: shortest, medium and longest in the
operating wavelength range. An alternative method is to measure the wavelength at the
maximum deviation in insertion loss.
4.2.4 Sending command
The command to operate from minimum (maximum) tilt to maximum (minimum) shall be set.
The minimum and maximum states of tilt are given when the deviation in insertion loss takes

the maximum value at the shortest or the longest wavelength within the operating wavelength.
After the setting, the command shall be sent from the control system.
4.2.5 Monitoring and recording the command complete flag
The output signal from the O/E converter and the command complete flag from the DUT shall
be monitored by the oscilloscope and the data shall be recorded. The command sending flag
from the control system, which may be substituted for the command complete flag from DUT if
not available, shall also be monitored and recorded.
4.2.6 Calculation of the response time
After the measurement at three wavelengths, the response time is calculated according to
Figure 1. Generally, the response time is defined as the maximum value among the three
response times.
4.3 Analogue control type
4.3.1 Set-up
The measurement set-up is as shown in Figure 2. The temperature shall be kept stabilized
and constant in the chamber for the measurement. The light source, the analogue control
system, O/E converter and oscilloscope shall be turned on for the measurement.
4.3.2 Preparation
Before starting the measurement, the set-up shall be stabilized for more than 1 h.
4.3.3 Wavelength setting
The wavelength of the light source shall be set at the measuring wavelength. The
measurement shall take place at three wavelengths: shortest, medium and longest
wavelengths in the operating wavelength range. An alternative method is to measure the
wavelength at the maximum deviation in insertion loss.
4.3.4 Applying the control signal
The control signal to operate from minimum (maximum) tilt to maximum (minimum) tilt shall be
set. The minimum and the maximum states of tilt occur when the deviation in insertion loss
takes the maximum value at the shortest or the longest wavelength within the operating
wavelength. After setting, the signal shall be sent from the control system.
4.3.5 Monitoring and recording the command complete flag
The output signal from the O/E converter shall be monitored by the oscilloscope and the data
recorded. The command complete flag from the control system shall also be monitored and
recorded.
4.3.6 Calculation of the response time
The response time is calculated according to Figure 3. After the measurement at three
wavelengths, the response time is calculated. Generally, the response time is defined as the
maximum value among the three response times.

– 14 – IEC 62343-5-1:2009 © IEC 2009
5 Details to be specified
5.1 Apparatus
5.1.1 Light source
These characteristics of the light source shall be specified:
– spectral width;
– state of polarization;
– output power.
5.1.2 Pulse generator
These characteristics of the pulse generator shall be specified:
– rising time;
– pulse width;
– pulse intensity.
5.1.3 O/E converter
These characteristics of the O/E converter shall be specified:
– response frequency;
– dynamic range.
5.1.4 Control system
These characteristics of the control system shall be specified:
– type of control system;
– type of interface.
5.2 Measurement conditions
These measurement conditions shall be specified:
– wavelength;
– deviation of tilt;
– insertion loss deviation at the measuring wavelength;
– temperature of chamber;
– tolerance of target insertion loss deviation.

Annex A
(informative)
Convergence criterion
A DGTE used in an optical amplifier converts input signals with time-varying gain tilt into
output signals in which gain tilt is nominally flat. A required flatness for multichannel EDFAs
for WDM systems is typically ± 0,5 dB for each spectral band. Therefore, the response time of
the DGTE is recommended to be defined as the convergence to ± 0,5 dB (≅±10 %) from target
attenuation.
– 16 – IEC 62343-5-1:2009 © IEC 2009
Annex B
(informative)
Measurement examples
Two examples are shown below. In the case where the insertion loss change is small and the
target power is within ± 10 % of the initial power at the measured wavelength, the response
time cannot be defined as in Figure B.2.
Initial optical power: 0 dBm (1,0 mW)
Target optical power: –3 dBm (0,5 mW) -> Target attenuation: –3 dB
Current power
0,0 dBm (1,00 mW)
90 % of current power
–0,5 dBm (0,90 mW)
–3,0 dB attenuation
110 % of target power
–2,6 dBm (0,55 mW)
Target power
–3,0 dBm (0,50 mW)
90 % of target power
–3,5 dBm (0,45 mW)
Command
T
T
p T c
r
Response time
Figure B.1 – Where insertion loss change is sufficient
Initial optical power: –5,0 dBm (0,32 mW)
Target optical power: –5,3 dBm (0,30 mW)  Target attenuation: –0,3 dB
110 % of target power
–4,9 dBm (0,33 mW)
Current power
–5,0 dBm (0,32 mW)
–0,3 dB Attenuation
Target power
–5,3 dBm (0,30 mW)
90 % of current power
–5,5 dBm (0,28 mW)
90 % of target power
–5,8 dBm (0,27 mW)
Command
–0,5 dBm (0,90 mW)
Response time cannot be defined

Figure B.2 – Where insertion loss change is small

Annex C
(informative)
Response time for specific DGTEs

Response time is defined as the maximum value over operating temperature range. An LCD
(liquid crystal device) may show longer response time at low temperature.

– 18 – IEC 62343-5-1:2009 © IEC 2009
Annex D
(informative)
Necessity for the correction of temperature dependency

The response time of the DGTE may depend on ambient temperature. Some devices have a
temperature controller in the package. Some devices have a temperature compensation
function to compensate the temperature dependence by tuning the applied voltage or the
current according to an ambient temperature. The correction for the direct control type shall
be carried out by a control system at a higher level. The digital control type of a DGTE has a
CPU and monitors an ambient temperature to correct the temperature effect by itself. The
analogue control type also has an analogue circuit and monitors an ambient temperature to
correct the temperature effect by itself.

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– 20 – IEC 62343-5-1:2009 © IEC 2009
SOMMAIRE
AVANT-PROPOS . 22
1 Domaine d'application et informations générales . 24
1.1 Domaine d’application . 24
1.2 Informations générales . 24
2 Termes, définitions, abréviations et formes d’ondes de réponse . 24
2.1 Termes et définitions . 24
2.2 Abréviations . 25
2.3 Formes d’ondes de réponse . 25
3 Matériel . 27
3.1 Source de rayonnement lumineux . 27
3.2 Générateur d'impulsions . 27
3.3 Convertisseur O/E . 28
3.4 Enceinte climatique . 28
3.5 Oscilloscope . 28
3.6 Jonctions temporaires . 28
3.7 Système de commande . 28
3.8 Montage de mesure . 28
4 Procédure . 29
4.1 Type à commande directe . 29
4.1.1 Montage . 29
4.1.2 Préparation . 30
4.1.3 Réglage de la longueur d’onde . 30
4.1.4 Réglage du générateur d’impulsions . 30
4.1.5 Application de l’impulsion de pilotage . 30
4.1.6 Surveillance et enregistrement du signal de sortie provenant du DGTE
en essai (DEE) . 30
4.1.7 Calcul du temps de réponse . 30
4.2 Type de commande numérique . 30
4.2.1 Montage . 30
4.2.2 Préparation . 30
4.2.3 Réglage de la longueur d’onde . 30
4.2.4 Commande de l’émission . 31
4.2.5 Surveillance et enregistrement du flag commande terminée . 31
4.2.6 Calcul du temps de réponse . 31
4.3 Type de commande analogique . 31
4.3.1 Montage . 31
4.3.2 Préparation . 31
4.3.3 Réglage de la longueur d’onde . 31
4.3.4 Application du signal de commande . 31
4.3.5 Surveillance et enregistrement du flag commande terminée . 31
4.3.6 Calcul du temps de réponse . 32
5 Détails à spécifier . 32
5.1 Matériel . 32
5.1.1 Source de rayonnement lumineux . 32
5.1.2 Générateur d'impulsions . 32
5.1.3 Convertisseur O/E . 32

5.1.4 Système de commande. 32
5.2 Conditions de mesure . 32
Annexe A (informative) Critère de convergence . 33
Annexe B (informative) Exemples de mesure . 34
Annexe C (informative) Temps de réponse pour les DGTE spécifiques . 36
Annexe D (informative) Nécessité de correction concernant la dépendance vis-à-vis
de la température. 37

Figure 1 – Formes d'ondes de réponse des DGTE à commande directe . 26
Figure 2 – Formes d'ondes de réponse des DGTE à commande numérique . 26
Figure 3 – Formes d'ondes de réponse des DGTE à commande analogique . 27
Figure 4 − Montage de mesure dans le cas de commande directe. 28
Figure 5 − Montage de mesure dans le cas de commande numérique . 29
Figure 6 – Montage de mesure dans la cas de commande analogique . 29
Figure B.1 − Lorsque la variation de la perte d’insertion est suffisante . 34
Figure B.2 − Lorsque la variation de la perte d’insertion est faible . 35

Tableau 1 – Classement des DGTE en fonction de la méthode de commande . 24

– 22 – IEC 62343-5-1:2009 © IEC 2009
COMMISSION ELECTROTECHNIQUE INTERNATIONALE
____________
MODULES DYNAMIQUES –
METHODES D’ESSAI –
Partie 5-1: Egaliseur dynamique de basculement de gain –
Mesure du temps de réponse
AVANT-PROPOS
1) La Commission Electrotechnique Internationale (CEI) est une organisation mondiale de normalisation
composée de l'ensemble des comités électrotechniques nationaux (Comités nationaux de la CEI). La CEI a
pour objet de favoriser la coopération internationale pour toutes les questions de normalisation dans les
domaines de l'électricité et de l'élec
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