SIST EN 61300-3-29:2006
(Main)Fibre optic interconnecting devices and passive components - Basic test and measurement procedures -- Part 3-29: Examinations and measurements - Measurement techniques for characterizing the amplitude of the spectral transfer function of DWDM components
Fibre optic interconnecting devices and passive components - Basic test and measurement procedures -- Part 3-29: Examinations and measurements - Measurement techniques for characterizing the amplitude of the spectral transfer function of DWDM components
This part of IEC 61300 identifies two basic measurement methods for characterising the spectral transfer functions of DWDM filter components. The transfer functions can be used to produce measurements of attenuation (A), polarisation dependent loss (PDL), isolation, centre wavelength and bandwidth (BW).
Lichtwellenleiter - Verbindungselemente und passive Bauteile - Grundlegende Prüf- und Messverfahren -- Teil 3-29: Untersuchungen und Messungen - Messverfahren zur Charakterisierung der spektralen 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 - Techniques de mesure pour caractériser l'amplitude de la fonction de transfert spectrale des composants DWDM
La présente partie de la CEI 61300 a pour objet d'identifier deux méthodes fondamentales de mesure pour caractériser les fonctions de transfert spectrales des composants à filtre DWDM (dense wavelength division multiplexing, multiplexage par répartition en longueur d'onde à forte densité). Les fonctions de transfert peuvent être utilisées pour produire des mesures d'affaiblissement (A), de perte dépendant de la polarisation (PDL, polarisation dependent loss), d'isolation, de longueur d'onde centrale et de largeur de bande (BW, bandwidth).
Naprave za medsebojno povezovanje optičnih vlaken in pasivne komponente – Osnovni preskusni in merilni postopki – 3-29. del: Preiskave in meritve – Merilne tehnike za ugotavljanje lastnosti amplitude spektralne prenosne funkcije komponent DWDM (IEC 61300-3-29:2005)
General Information
Relations
Standards Content (Sample)
SLOVENSKI SIST EN 61300-3-29:2006
STANDARD
julij 2006
Naprave za medsebojno povezovanje optičnih vlaken in pasivne komponente
– Osnovni preskusni in merilni postopki – 3-29. del: Preiskave in meritve –
Merilne tehnike za ugotavljanje lastnosti amplitude spektralne prenosne
funkcije komponent DWDM (IEC 61300-3-29:2005)
Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 3-29: Examinations and measurements –
Measurement techniques for characterizing the amplitude of the spectral transfer
function of DWDM components (IEC 61300-3-29:2005)
ICS 33.180.20 Referenčna številka
SIST EN 61300-3-29:2006(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 61300-3-29
NORME EUROPÉENNE
March 2006
EUROPÄISCHE NORM
ICS 33.180.20
English version
Fibre optic interconnecting devices and passive components -
Basic test and measurement procedures
Part 3-29: Examinations and measurements -
Measurement techniques for characterizing the amplitude
of the spectral transfer function of DWDM components
(IEC 61300-3-29:2005)
Dispositifs d'interconnexion Lichtwellenleiter -
et composants passifs à fibres optiques - Verbindungselemente
Méthodes fondamentales und passive Bauteile -
d'essais et de mesures Grundlegende Prüf- und Messverfahren
Partie 3-29: Examens et mesures - Teil 3-29: Untersuchungen
Techniques de mesure pour caractériser und Messungen -
l'amplitude de la fonction de transfert Messverfahren zur Charakterisierung
spectrale des composants DWDM der spektralen Übertragungsfunktion
(CEI 61300-3-29:2005) von DWDM-Bauteilen
(IEC 61300-3-29:2005)
This European Standard was approved by CENELEC on 2006-03-01. 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, Cyprus, the Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the 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
© 2006 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61300-3-29:2006 E
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EN 61300-3-29:2006 - 2 -
Foreword
The text of document 86B/2216/FDIS, future edition 1 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 was approved by CENELEC as EN 61300-3-29 on 2006-03-01.
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) 2006-12-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2009-03-01
This European Standard makes reference to International Standards. Where the International Standard
referred to has been endorsed as a European Standard or a home-grown European Standard exists, this
European Standard shall be applied instead. Pertinent information can be found on the CENELEC web
site.
__________
Endorsement notice
The text of the International Standard IEC 61300-3-29:2005 was approved by CENELEC as a European
Standard without any modification.
__________
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NORME CEI
INTERNATIONALE
IEC
61300-3-29
INTERNATIONAL
Première édition
STANDARD
First edition
2005-12
Dispositifs d'interconnexion et
composants passifs à fibres optiques –
Méthodes fondamentales d'essais
et de mesures –
Partie 3-29:
Examens et mesures –
Techniques de mesure pour caractériser
l'amplitude de la fonction de transfert
spectrale des composants DWDM
Fibre optic interconnecting devices
and passive components –
Basic test and measurement procedures –
Part 3-29:
Examinations and measurements –
Measurement techniques for characterizing
the amplitude of the spectral transfer function
of DWDM components
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Pour prix, voir catalogue en vigueur
For price, see current catalogue
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61300-3-29 IEC:2005 – 3 –
CONTENTS
FOREWORD.7
1 Scope.11
2 Normative references .11
3 General description .11
3.1 Overview .11
3.2 Terms and abbreviations .13
4 Apparatus.15
4.1 Source .17
4.2 Polarisation controller.21
4.3 Device under test (DUT).21
4.4 Receiver system.23
4.5 Temporary joints (TJ) .25
5 Procedure .25
5.1 Preparation of specimens .25
5.2 System initialisation .27
5.3 System reference measurement .27
5.4 Measurement of device spectra.29
6 Characterisation of the device under test.29
6.1 Determination of transfer functions .29
6.2 Calculation of attenuation (A) .31
6.3 Transmission [T(λ)] spectra measurements .31
6.4 Polarisation dependent losses (PDL(λ)).41
7 Details to be specified .43
7.1 Tuning sub-system .43
7.2 Power detector .43
7.3 DUT .43
Annex A (informative) Reflection spectrum measurements.45
Annex B (informative) Determination of the wavelength increment parameter .53
Annex C (informative) Determination of a mean value using the shorth function.57
Annex D (informative) Precautions using IEC 61300-3-7.61
Figure 1 – Basic measurement apparatus .15
Figure 2 – Measurement apparatus for tuneable laser system.15
Figure 3 – Measurement apparatus for tuneable receiver system.17
Figure 4 – System reference for transmission measurement .27
Figure 5 – Normalised transfer functions for a band pass filter (a) and a notch filter (b) .33
Figure 6 – BW and full spectral width for a fibre Bragg grating .37
Figure 7 – Channel isolation .39
Figure 8 – Polarisation dependence of the transfer function.41
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61300-3-29 IEC:2005 – 5 –
Figure A.1 – Measurement apparatus for a single port device .45
Figure A2 – Source reference set-up .47
Figure A3 – Set-up for measurement of system constant .49
Figure C1 – Example response and –x dB wavelengths .57
Figure C2 – Example showing the – 0,5 dB wavelengths based on the shorth (dotted
vertical lines) and the mean (solid vertical lines) .59
Figure D1 – Comparison of transfer function using various sources .63
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61300-3-29 IEC:2005 – 7 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
FIBRE OPTIC INTERCONNECTING DEVICES
AND PASSIVE COMPONENTS –
BASIC TEST AND MEASUREMENT PROCEDURES –
Part 3-29: Examinations and measurements –
Measurement techniques for characterising the amplitude
of the spectral transfer function of DWDM components
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-
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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 provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
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 standard cancels and replaces IEC/PAS 61300-3-29 published in 2002.
The text of this standard is based on the following documents:
FDIS Report on voting
86B/2216/DIS 86B/2253/RVD
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61300-3-29 IEC:2005 – 9 –
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.
IEC 61300 consists of the following parts, under the general title Fibre optic interconnecting
devices and passive components – Basic test and measurement procedures:
Part 1: General and guidance
Part 2: Tests
Part 3: Examinations and measurements.
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.
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61300-3-29 IEC:2005 – 11 –
FIBRE OPTIC INTERCONNECTING DEVICES
AND PASSIVE COMPONENTS –
BASIC TEST AND MEASUREMENT PROCEDURES –
Part 3-29: Examinations and measurements –
Measurement techniques for characterising the amplitude
of the spectral transfer function of DWDM components
1 Scope
This part of IEC 61300 identifies two basic measurement methods for characterising the
spectral transfer functions of DWDM filter components.
The transfer functions can be used to produce measurements of attenuation (A), polarisation
dependent loss (PDL), isolation, centre wavelength and bandwidth (BW).
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 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 – Polarisation
dependence of attenuation 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
IEC 61300-3-12: Fibre optic interconnecting devices and passive components – Basic test
and measurement procedures – Part 3-12: Examinations and measurements – Polarisation
dependence of attenuation of a single-mode fibre optic component: Matrix calculation method
3 General description
3.1 Overview
This document is complementary to the wavelength dependence of attenuation and return
loss (IEC 61300-3-7), polarisation dependence of attenuation (IEC 61300-3-2), and the
polarisation dependence of attenuation using matrix methods (IEC 61300-3-12) test
procedures. In general, these 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.
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61300-3-29 IEC:2005 – 13 –
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 laser source and a broad band detector,
while Method B uses a broad band source and a tuneable receiver. Method A shall be
considered the reference test method for DWDM devices.
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;
Annex D Precautions in using IEC 61300-3-7 for DWDM devices.
3.2 Terms and abbreviations
Many of the terms and abbreviations in this document are described in the generic standard
IEC 60050-731. Some terms and abbreviations specific to this measurement technique are
included below.
ASE: Amplified spontaneous emission.
BW: Bandwidth: The spectral width of a signal or filter. In the case of a laser signal
such as a tuneable laser 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). Must be defined as the distance between the
closest crossings on either side of the centre wavelength in the cases where the
spectral shape has more than 2 such points. The distance between the outermost
crossings can be considered the full spectral width.
δ: Wavelength sampling increment during the measurement.
λ : Centre channel or nominal operating wavelength for a component
h
OWR: Operating wavelength range. The specified range of wavelengths from λ to
hmin
λ centred about the nominal operating wavelength, within which a WDM
hmax
device operates.
SOP: State of polarisation. The distribution of light energy among the two linearly
independent solutions of the wave equations for the electric field.
SSE: Source spontaneous emission: Broad band emissions from a laser cavity that bear
no phase relation to the cavity field. These emissions can be seen as the baseline
noise on an optical spectrum analyzer.
TLS: Tuneable laser source.
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61300-3-29 IEC:2005 – 15 –
4 Apparatus
The basic measurement set-up for the characterisation of DWDM components is shown in
Figure 1 below.
Polarisation
Source
DUT Receiver
controller
IEC 2538/05
Figure 1 – Basic measurement apparatus
As mentioned in the general discussion, this procedure contains two distinct methods that
differ fundamentally in the way in which the wavelength resolution is achieved. There are
three key influences on the wavelength resolution: the linewidth of the source or bandwidth of
the tuneable receiver, 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 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 receiver.
Practical constraints may result in smaller or larger bandwidths than recommended. Two
cautions with smaller bandwidths: first, coherent interference effects can lead to additional
measurement errors, and second, undersampling 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 nm/ dB, 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.
A detailed explanation of the various components of this system and their functions is
contained below. Apparatuses for both the Tuneable Laser and the Tuneable Receiver
procedures are shown in Figures 2 and 3.
Detector
TJ2
DUT
(D1)
TJ1
RBD
PPololariarissaattiion on
(optional)
ccontontrolrolller er
Tracking
Detector
TLS filter RBD (D2)
TJ4
(optional)
(optional)
Wavelength
monitor
IEC 2539/05
Figure 2 – Measurement apparatus for tuneable laser system
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61300-3-29 IEC:2005 – 17 –
Broadband
Polarisation Tuneable
source DUT
controller receiver
(unpolarised)
IEC 2540/05
Figure 3 – Measurement apparatus for tuneable receiver system
4.1 Source
4.1.1 Tuneable laser, Method A
This method uses a polarised tuneable laser source (TLS) 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 better than ± 0,01 dB over
the measuring period. This stability can be obtained using the optional detector D2 in Figure 2
as a reference detector. If D2 is synchronised with D1, 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 more dynamic range 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 accuracy of the TLS shall be approximately an order of magnitude better than
the step size for each point in the measuring range. This accuracy 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 tuneable laser source 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 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 dBc.
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61300-3-29 IEC:2005 – 19 –
4.1.1.1 Tracking filter
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 must 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.
4.1.1.2 Reference branching device (RBD)
The configuration of the RBD is 1x2 or 2x2. If its configuration is 2x2, one port of the RBD
shall be terminated to have a back reflection <–50 dB. The splitting ratio of the RBD shall be
stable with wavelength. It shall also be insensitive to polarisation. The polarisation sensitivity
of transmission attenuation shall be less than one tenth of the wavelength dependency of
attenuation to be measured. The polarisation mode dispersion of the RBD shall be less than
one half of the coherence time of the source so as not to depolarise 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.
4.1.1.3 Wavelength monitor
In this test procedure, the wavelength accuracy of the source needs to be extremely accurate
and closely monitored. If the tuning accuracy 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 accuracy
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 accuracy of the TLS must be
sufficient to resolve the absorption lines.
Regarding the wavelength repeatability of the TLS + 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.
4.1.2 Broad band source (BBS), Method B
This method uses an unpolarised broadband light source such as an LED or an amplified
spontaneous emission (ASE) source. The source spectrum must 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 must 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 synchronised tuneable receiver).
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61300-3-29 IEC:2005 – 21 –
The degree of polarization (DOP) of the source should be less than 10 % to avoid biasing
those measurements that require unpolarised light. Care should be taken to ensure that the
narrow width of the tuneable filter does not increase the effective DOP beyond this limit.
In some instances, the tuneable filter used for this method could be placed after the BBS
creating an unpolarised TLS. In this instance, the filter characteristics should be as described
in the tuneable receiver section (4.4.2).
4.2 Polarisation controller
The polarisation controller is used to control the input state of polarisation (SOP). In the event
of a polarisation dependent measurement, the controller will be used
...
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