SIST EN 61290-10-3:2004

Optical amplifiers - Test methods -- Part 10-3: Multichannel parameters - Probe methods

This part of 61290 applies to commercially available optical fibre amplifiers (OFAs) using active fibres containing rare-earth dopants. This standard establishes uniform requirements for accurate and reliable measurements of the multichannel gain and noise paramenters as defined in EN 61292-4.

Prüfverfahren für Lichtwellenleiter-Verstärker -- Teil 10-3: Mehrkanalparameter - Sondenmessverfahren

Amplificateurs optiques - Méthodes d'essai -- Partie 10-3: Paramètres à canaux multiples - Méthodes par sondage

S'applique aux amplificateurs à fibres optiques (AFO), actuellement disponibles sur le marché, qui utilisent des fibres actives dopées aux terres rares. Etablit des prescriptions uniformes en vue de mesures précises et fiables des paramètres de gain et de bruit à canaux multiples tels que définis dans CEI 61291-4.

Optični ojačevalci – Preskusne metode – 10-3. del: Parametri z več kanali - Metode merjenja s sondami (IEC 61290-10-3:2002)*

General Information

• Status: Published
• Publication Date: 31-Aug-2004
• ICS: 33.180.20 - Fibre optic interconnecting devices
• ICS: 33.180.30 - Optic amplifiers
• Technical Committee: iTEL - Communication cables
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Sep-2004
• Due Date: 01-Sep-2004
• Completion Date: 01-Sep-2004
• Ref Project: EN 61290-10-3:2003 - Optical amplifiers - Test methods - Part 10-3: Multichannel parameters - Probe methods

Standards Content (Sample)

SLOVENSKI SIST EN 61290-10-3:2004

STANDARD
september 2004
Optični ojačevalci – Preskusne metode – 10-3. del: Parametri z več kanali -
Metode merjenja s sondami (IEC 61290-10-3:2002)*
Optical amplifiers - Test methods - Part 10-3: Multichannel parameters - Probe
methods (IEC 61290-10-3:2002)
ICS 33.180.30 Referenčna številka
SIST EN 61290-10-3:2004(en)
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

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EUROPEAN STANDARD EN 61290-10-3
NORME EUROPÉENNE
EUROPÄISCHE NORM July 2003

ICS 33.180.20


English version


Optical amplifiers -
Test methods
Part 10-3: Multichannel parameters -
Probe methods
(IEC 61290-10-3:2002)


Amplificateurs optiques -  Prüfverfahren für
Méthodes d'essai Lichtwellenleiter-Verstärker
Partie 10-3: Paramètres à canaux Teil 10-3: Mehrkanalparameter -
multiples - Sondenmessverfahren
Méthodes par sondage (IEC 61290-10-3:2002)
(CEI 61290-10-3:2002)






This European Standard was approved by CENELEC on 2003-02-01. 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 Central Secretariat 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 Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic,
Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels


© 2003 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 61290-10-3:2003 E

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EN 61290-10-3:2003 - 2 -
Foreword

The text of document 86C/459/FDIS, future edition 1 of IEC 61290-10-3, prepared by SC 86C, Fibre
optic systems and active devices, of IEC TC 86, Fibre optics, was submitted to the IEC-CENELEC
parallel vote and was approved by CENELEC as EN 61290-10-3 on 2003-02-01.

This standard shall be read in conjunction with EN 61291-1:1998 and EN 61290-3:2000

The following dates were fixed:

– latest date by which the EN has to be implemented
 at national level by publication of an identical
 national standard or by endorsement (dop) 2004-02-01

– latest date by which the national standards conflicting
 with the EN have to be withdrawn (dow) 2006-02-01

Annexes designated "normative" are part of the body of the standard.
Annexes designated "informative" are given for information only.
In this standard, annex ZA is normative and annexes A and B are informative.
Annex ZA has been added by CENELEC.
__________

Endorsement notice

The text of the International Standard IEC 61290-10-3:2002 was approved by CENELEC as a European
Standard without any modification.

In the official version, for Bibliography, the following notes have to be added for the standards
indicated:

IEC 60825-1 NOTE Harmonized as EN 60825-1:1994 (not modified).

IEC 60825-2 NOTE Harmonized as EN 60825-2:2000 (not modified).

IEC 60874-1 NOTE Harmonized as EN 60874-1:1999 (not modified).

__________

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- 3 - EN 61290-10-3:2003
Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications
This European Standard incorporates by dated or undated reference, provisions from other
publications. These normative references are cited at the appropriate places in the text and the
publications are listed hereafter. For dated references, subsequent amendments to or revisions of any
of these publications apply to this European Standard only when incorporated in it by amendment or
revision. For undated references the latest edition of the publication referred to applies (including
amendments).
NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
Publication Year Title EN/HD Year
1) 2)
IEC 61290-3 - Optical fibre amplifiers - Basic EN 61290-3 2000
specification
Part 3: Test methods for noise figure
parameters

1) 2)
IEC 61290-10-1 - Optical amplifiers – Test methods EN 61290-10-1 2003
Part 10-1: Multichannel parameters -
Pulse method using an optical switch
and optical spectrum analyzer

1) 2)
IEC 61290-10-2 - Part 10-2: Multichannel parameters - EN 61290-10-2 2003
Pulse method using a gated optical
spectrum analyzer

1) 2)
IEC 61291-1 - Optical fibre amplifiers EN 61291-1 1998
Part 1: Generic specification

1) 2)
IEC 61291-4 - Optical amplifiers EN 61291-4 2003
Part 4: Multichannel applications -
Performance specification template





1)
Undated reference.
2)
Valid edition at date of issue.

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NORME CEI
INTERNATIONALE IEC
61290-10-3
INTERNATIONAL
Première édition
STANDARD
First edition
2002-12
Amplificateurs optiques –
Méthodes d'essai –
Partie 10-3:
Paramètres à canaux multiples –
Méthodes par sondage
Optical amplifiers –
Test methods –
Part 10-3:
Multichannel parameters –
Probe methods
 IEC 2003 Droits de reproduction réservés  Copyright - all rights reserved
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in any
utilisée sous quelque forme que ce soit et par aucun procédé, form or by any means, electronic or mechanical, including
électronique ou mécanique, y compris la photocopie et les photocopying and microfilm, without permission in writing from
microfilms, sans l'accord écrit de l'éditeur. the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: [phone] Telefax: [phone] E-mail: [e-mail]  Web: www.iec.ch
CODE PRIX
R
Commission Electrotechnique Internationale PRICE CODE
International Electrotechnical Commission
Международная Электротехническая Комиссия
Pour prix, voir catalogue en vigueur
For price, see current catalogue

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61290-10-3  IEC:2003 – 3 –
CONTENTS
FOREWORD . 5
INTRODUCTION .7
1 Scope and object . 9
2 Normative references.11
3 Apparatus .11
3.1 Laser probe method.13
3.2 Broadband noise probe method .13
3.3 Detailed description of apparatus.15
4 Test sample.21
5 Procedure.21
5.1 Setting the saturation condition.21
5.2 Laser probe method.25
5.3 Broadband noise probe method .25
6 Calculations.29
6.1 Laser probe method.29
6.2 Broadband source method .31
7 Test results.33
Annex A (informative) List of abbreviations .35
Annex B (informative) Relevant patents .37
Bibliography.39
Figure 1 – Block diagrams for probe methods .15
Figure 2 – Modulated optical sources .17
Figure 3 – A reduced set of saturating wavelengths – (b) replaces the full set (a) in
each region .23
Figure 4 – Typical timing for broadband noise probe method.27

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61290-10-3  IEC:2003 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
OPTICAL AMPLIFIERS –
TEST METHODS –
Part 10-3: Multichannel parameters –
Probe methods
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the 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, the IEC publishes International Standards. 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. The 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 the 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 National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical specifications, technical reports or guides and they are accepted by the National
Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61290-10-3 has been prepared by subcommittee 86C: Fibre optic
systems and active devices, of IEC technical committee 86: Fibre optics.
This standard should be read in conjunction with IEC 61291-1 and 61290-3
This bilingual version (2003-06) replaces the English version.
The text of this standard is based on the following documents:
FDIS Report on voting
86C/459/FDIS 86C/483/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 3.
The committee has decided that the contents of this publication will remain unchanged until
2008-12. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.

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61290-10-3  IEC:2003 – 7 –
INTRODUCTION
Each abbreviation introduced in this International Standard is explained in the text at least the
first time that it appears. However, for an easier understanding of the whole text, a list of all
abbreviations used in this International Standard is given in Annex A.

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61290-10-3  IEC:2003 – 9 –
OPTICAL AMPLIFIERS –
TEST METHODS –
Part 10-3: Multichannel parameters –
Probe methods
1 Scope and object
This part of IEC 61290 applies to commercially available optical fibre amplifiers (OFAs) using
active fibres containing rare-earth dopants as described in the following.
The object of this international standard is to establish uniform requirements for accurate
and reliable measurements of the multichannel gain and noise parameters as defined
in IEC 61291-4.
The test methods described in this standard use small-signal probes to obtain the
multichannel gain and noise parameters while one or more lasers set the saturation condition
for the OFA. These methods are classified as indirect in that there is not a laser source at
each wavelength of the multichannel plan. Multichannel parameters are estimated from the
probe data. IEC 61290-10-1 and IEC 61290-10-2 are test methods for measuring noise
parameters using pulse techniques. These methods are direct in that the multichannel source
is required to have a laser at each wavelength for which multichannel parameters are to be
measured.
Probe techniques provide clear advantages for measuring multichannel gain characteristics in
that a simple source configuration can provide parameters for a wide range of multichannel
plans. Either a small-signal laser or a broadband noise source serves as the probe signal, and
single or multiple lasers are used to set the OFA saturation condition. Pulse modulation of the
saturating sources may optionally be used to measure ASE at or near the saturating laser
wavelengths without the contaminating effect of source spontaneous emission. If pulse
modulation is not used, the source spontaneous emission must be measured, and its effect
removed from the measured result. For a multichannel source with high spontaneous
emission or at high total input power, the source noise subtraction method can lead to large
uncertainty.
The probe techniques described herein are indirect in that laser sources are not required at
each channel frequency. A measurement error results from inhomogeneous effects that are
1
DUT dependent. The main source of this error is spectral hole burning (see [1] [2] and [4]).
The applicability of pulse modulation of the saturating signal(s) and the selection of the
modulation rate are dependent on the optical fibre amplifier’s characteristics, specifically its
time response. They may be unsuitable for amplifiers with active automatic level control (ALC)
or automatic gain control (AGC) circuits. They may also be unsuitable for praseodymium-
doped OFAs that have gain relaxation times that are much faster than erbium-doped designs.
For erbium-doped fibre amplifiers (EDFAs), inaccuracy due to modulation is generally small.
Refer to IEC 61290-10-2 for a discussion of inaccuracy due to pulse repetition rate.
———————
1
 Numbers in brackets refer to the bibliography.

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61290-10-3  IEC:2003 – 11 –
In order to predict multichannel parameters by probe methods it is necessary to properly set
the output level of the saturating signal(s) to simulate the saturation effect of a specified
multichannel plan. Clause 5 describes a methodology to accomplish this under the
assumption of homogeneous behavior within a wavelength region. This methodology has the
limitation that the wavelength dependence of any output coupling circuit from the active fibre
to the output port is assumed to be zero within defined regions.
Parameters measured with the methods described herein include channel gain, channel
signal-spontaneous noise figure, and amplified spontaneous emission (ASE).
Values marked with(*) indicate preliminary values. Final values are under study.
2 Normative references
The following referenced documents are indispensable for the application 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 61290-3, Optical fibre amplifiers – Basic specification – Part 3: Test methods for noise
figure parameters
IEC 61290-10-1, Optical amplifiers – Test methods – Part 10-1: Multichannel parameters –
Pulse method using an optical switch and optical spectrum analyzer
IEC 61290-10-2, Optical amplifiers – Test methods – Part 10-2: Multichannel parameters –
Pulse method using a gated optical spectrum analyzer
IEC 61291-1, Optical fibre amplifiers – Part 1: Generic specification
IEC 61291-4, Optical amplifiers – Part 4: Multichannel applications – Performance
specification template
3 Apparatus
The probe methods require two sources. The first establishes the inversion (saturation) level
of the optical amplifier and consists of one or more lasers. The second source is the small-
signal probe and may consist of a laser or broadband noise source. In either case, care must
be taken that the probe does not effect amplifier inversion. The laser source module may be
pulse modulated in order to extinguish the source for more-accurate noise measurement as
described in IEC 61290-10-1 or IEC 61290-10-2. For the probe methods described herein,
modulation is optional.
Both laser and noise probe methods can provide similar measurement uncertainty. The noise
probe method is generally faster so is preferred when measurement throughput is important.

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61290-10-3  IEC:2003 – 13 –
3.1 Laser probe method
Figure 1(a) is a diagram of the laser probe configuration. The source module, as described
in 3.3, may consist of a single or multiple lasers. Optional polarization controllers following the
sources improve accuracy by averaging system and amplifier polarization dependencies. They
also may be used to quantify the polarization dependent gain (PDG) and polarization hole
burning (PHB) of the OFA. While a single polarization controller is shown external to the source
module, for best accuracy with a multichannel source, each channel requires polarization
averaging to eliminate uncertainty due to polarization hole burning. The optional optical switch
at the output of the DUT is to implement the pulse technique with optical switching.
3.2 Broadband noise probe method
Figure 1(b) is a diagram of the noise probe configuration. In order for the broadband source to
have sufficiently low total output power, it is necessary that it be modulated at a low repetition
rate and a low duty cycle and that the OSA measurement be synchronized with the probe ON
and OFF periods. This is accomplished with a control signal from the OSA.

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61290-10-3  IEC:2003 – 15 –
Polarization
Source
controller
Trigger from
module
Trigger from
(optional)
source module
source module
Trigger to optical switch
Optical
Optical
Coupler
or OSA, when the source
switch
OFA dB spectrum
module is modulated
(optional)
analyzer
Variable
optical
DUT
attenuator
(optional)
Polarization
Probe
controller
DB
laser
(optional)
(tunable)
Variable
optical
IEC  2623/02
attenuator
Figure 1a – Block diagram for probe method using a laser probe source
Source
Polarization
Trigger from
module
controller
source module
Trigger from
source module
Optical
Optical
Trigger to optical
Coupler spectrum
OFA switch dB
switch or OSA
analyzer
(optional)
Variable
optical
DUT
attenuator
(optional)
Control signal to
broadband noise
Broadband
noise source source
module
Control signal from OSA
IEC  2624/02
Figure 1b – Block diagram for probe method using a broadband noise probe source
Figure 1 – Block diagrams for probe methods
3.3 Detailed description of apparatus
3.3.1 Source module
When the source module is modulated, two arrangements are possible as shown in Figures
2a and 2b. Source module (a) consists of CW optical sources with an external optical switch
and attenuator(s). Source module (b) consists of directly mod
...