SIST EN 61300-3-38:2012

SLOVENSKI STANDARD
SIST EN 61300-3-38:2012
01-oktober-2012
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Fibre optic interconnecting devices and passive components - Basic test and
measurement procedures - Part 3-38:Examinations and measurements - Group delay,
chromatic dispersion and phase ripple (IEC 61300-3-38:2012)
Lichtwellenleiter - Verbindungselemente und passive Bauteile - Grundlegende Prüf- und
Messverfahren -- Teil 3-38: Untersuchungen und Messungen - Gruppenlaufzeit,
chromatische Dispersion und Phasenwelligkeit (IEC 61300-3-38:2012)
Dispositifs d’interconnexion et composants passifs à fibres optiques - Procédures
fondamentales d'essais et de mesures - Partie 3-38: Examens et mesures - Retard de
groupe, dispersion chromatique et fluctuation de phase (CEI 61300-3-38:2012)
Ta slovenski standard je istoveten z: EN 61300-3-38:2012
ICS:
33.180.20 3RYH]RYDOQHQDSUDYH]D Fibre optic interconnecting
RSWLþQDYODNQD devices
SIST EN 61300-3-38:2012 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 61300-3-38:2012

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SIST EN 61300-3-38:2012

EUROPEAN STANDARD
EN 61300-3-38

NORME EUROPÉENNE
August 2012
EUROPÄISCHE NORM

ICS 33.180.10


English version


Fibre optic interconnecting devices and passive components -
Basic test and measurement procedures -
Part 3-38:Examinations and measurements -
Group delay, chromatic dispersion and phase ripple
(IEC 61300-3-38:2012)


Dispositifs d’interconnexion et Lichtwellenleiter -
composants passifs à fibres optiques - Verbindungselemente und passive
Procédures fondamentales d'essais Bauteile -
et de mesures - Grundlegende Prüf- und Messverfahren -
Partie 3-38: Examens et mesures - Teil 3-38: Untersuchungen und
Retard de groupe, dispersion chromatique Messungen -
et fluctuation de phase Gruppenlaufzeitverzögerung,
(CEI 61300-3-38:2012) chromatische Dispersion und
Phasenwelligkeit
(IEC 61300-3-38:2012)


This European Standard was approved by CENELEC on 2012-07-03. 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.

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

Management Centre: Avenue Marnix 17, B - 1000 Brussels


© 2012 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61300-3-38:2012 E

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SIST EN 61300-3-38:2012
EN 61300-3-38:2012 - 2 -
Foreword
The text of document 86B/3394/FDIS, future edition 1 of IEC 61300-3-38, 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 61300-3-38:2012.
The following dates are fixed:
(dop) 2013-04-03
• latest date by which the document has
to be implemented at national level by
publication of an identical national
standard or by endorsement
(dow) 2015-07-03
• latest date by which the national
standards conflicting with the
document have to be withdrawn

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 61300-3-38:2012 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 60793-1-42 NOTE Harmonised as EN 60793-1-42.
IEC 61300-1 NOTE Harmonised as EN 61300-1.
IEC 61300-3-1 NOTE Harmonised as EN 61300-3-1.
IEC 61300-3-32 NOTE Harmonised as EN 61300-3-32.

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SIST EN 61300-3-38:2012
- 3 - EN 61300-3-38:2012
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  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.

Publication Year Title EN/HD Year

IEC 60050-731 - International Electrotechnical Vocabulary - -
(IEV) -
Chapter 731: Optical fibre communication


IEC 61300-3-29 - Fibre optic interconnecting devices and EN 61300-3-29 -
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

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SIST EN 61300-3-38:2012

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SIST EN 61300-3-38:2012




IEC 61300-3-38

®


Edition 1.0 2012-05




INTERNATIONAL



STANDARD




NORME



INTERNATIONALE
colour

inside










Fibre optic interconnecting devices and passive components – Basic test and

measurement procedures –

Part 3-38: Examinations and measurements – Group delay, chromatic dispersion


and phase ripple



Dispositifs d’interconnexion et composants passifs à fibres optiques –


Procédures fondamentales d'essais et de mesures –

Partie 3-38: Examens et mesures – Retard de groupe, dispersion chromatique et

fluctuation de phase










INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE

PRICE CODE
INTERNATIONALE

CODE PRIX X


ICS 33.180.10 ISBN 978-2-83220-115-2



Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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SIST EN 61300-3-38:2012
– 2 – 61300-3-38 © IEC:2012
CONTENTS
FOREWORD . 5
1 Scope . 7
2 Normative references . 7
3 Terms and abbreviations . 7
4 General description . 8
5 Apparatus . 9
5.1 Modulation phase shift method . 9
5.1.1 General . 9
5.1.2 Variable wavelength source VWS . 9
5.1.3 Tracking filter (optional) . 9
5.1.4 Reference branching device RBD1, RBD2 . 10
5.1.5 Wavelength monitor (optional) . 10
5.1.6 Device under test DUT . 10
5.1.7 Detectors D1, D2 . 10
5.1.8 RF generator . 11
5.1.9 Amplitude modulator . 11
5.1.10 Phase comparator . 11
5.1.11 Temporary joints TJ1, TJ2 . 11
5.1.12 Polarization controller (optional) . 11
5.1.13 Reference jumper . 12
5.2 Swept wavelength interferometry method . 12
5.2.1 General . 12
5.2.2 Tunable laser source TLS . 12
5.2.3 Wavelength monitor . 13
5.2.4 Reference branching devices RBD1, RBD2, RBD3 . 13
5.2.5 Detectors D1, D2 . 13
5.2.6 Polarization controller . 13
5.2.7 Polarization analyzer . 13
5.3 Polarization phase shift method . 13
5.3.1 General . 13
5.3.2 Tunable laser source TLS . 14
5.3.3 RF generator . 14
5.3.4 Amplitude modulator . 15
5.3.5 Polarization controller . 15
5.3.6 Polarization splitter . 15
5.3.7 Detectors D1, D2 . 15
5.3.8 Amplitude and phase comparator . 16
6 Measurement procedure . 16
6.1 Modulation phase shift method . 16
6.1.1 Measurement principle . 16
6.1.2 RF modulation frequency . 16
6.1.3 Test sequence . 18
6.1.4 Special notice for measurement of GDR . 19
6.1.5 Calculation of relative group delay . 19
6.2 Swept wavelength interferometry method . 19
6.2.1 Measurement principle . 19

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SIST EN 61300-3-38:2012
61300-3-38 © IEC:2012 – 3 –
6.2.2 Test sequence . 20
6.2.3 Special notice for measurement of GDR . 20
6.2.4 Calculation of group delay . 20
6.3 Polarization phase shift method . 21
6.3.1 Modulation frequency . 21
6.3.2 Wavelength increment . 22
6.3.3 Scanning wavelength and measuring CD . 22
6.3.4 Calibration . 22
6.3.5 Calculation of relative group delay and CD . 23
6.4 Measurement window (common for all test methods) . 23
7 Analysis . 25
7.1 Noise reduction of group delay measurement . 25
7.1.1 Averaging . 25
7.1.2 Spectral filtering . 25
7.2 Linear phase variation . 25
7.3 Chromatic dispersion . 25
7.3.1 General . 25
7.3.2 Finite difference calculation . 26
7.3.3 Curve fit . 26
7.4 Phase ripple . 27
7.4.1 General . 27
7.4.2 Slope fitting . 27
7.4.3 GDR estimation . 27
7.4.4 Phase ripple calculation . 28
8 Examples of measurement . 28
8.1 50GHz band-pass thin-film filter . 28
8.2 Planar waveguide filter component . 29
8.3 Tunable dispersion compensator (fiber bragg grating) . 30
8.4 Random polarization mode coupling device . 30
9 Details to be specified . 31
Annex A (informative) Calculation of differential group delay . 32
Bibliography . 40

Figure 1 – MPS measurement method apparatus . 9
Figure 2 – SWI measurement method apparatus . 12
Figure 3 – PPS measurement method apparatus . 14
Figure 4 – Sampling at the modulation frequency . 18
Figure 5 – Measurement window centred on an ITU wavelength with a defined width . 24
Figure 6 – Measurement window determined by the insertion loss curve at 3dB . 24
Figure 7 – Calculated CD from fitted GD over a 25 GHz optical BW centred on the ITU
frequency . 26
Figure 8 – A 6th order polynomial curve is fitted to relative GD data over a 25 GHz
optical BW centred on the ITU frequency . 27
Figure 9 – Estimation of the amplitude of the GD ripple and the period . 28
Figure 10 – GD and loss spectra for a 50 GHz-channel-spacing DWDM filter . 28
Figure 11 – Measured GD and loss spectra for planar waveguide filter . 29
Figure 12 – Measured CD and loss spectra for planar waveguide filter . 29

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SIST EN 61300-3-38:2012
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Figure 13 – Measured GD deviation of a fibre Bragg grating . 30
Figure 14 – Measured phase ripple of a fibre Bragg grating . 30
Figure 15 – Measured GD for a device with random polarization mode coupling . 31
Figure 16 – Measured CD for a device with random polarization mode coupling . 31
Figure A.1 – Mueller states on Poincaré sphere . 32
Figure A.2 – DGD spectrum for a 50 GHz bandpass filter, measured with 30 pm
resolution BW . 35
Figure A.3 – DGD versus wavelength for a random polarization mode coupling device
(example) . 37
Figure A.4 – DGD versus wavelength for a fibre Bragg grating filter (example) . 37

Table 1 – Modulation frequency versus wavelength resolution for C-band . 17
Table A.1 – Example of Mueller set . 33

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SIST EN 61300-3-38:2012
61300-3-38 © IEC:2012 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

FIBRE OPTIC INTERCONNECTING DEVICES
AND PASSIVE COMPONENTS –
BASIC TEST AND MEASUREMENT PROCEDURES –

Part 3-38: Examinations and measurements –
Group delay, chromatic dispersion and phase ripple

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 61300-3-38 has been prepared by subcommittee 86B: Fibre optic
interconnecting devices and passive components, of IEC technical committee 86: Fibre optics.
This first edition cancels and replaces the IEC/PAS 61300-3-38 published in 2007. This edition
constitutes a technical revision.
The text of this standard is based on the following documents:
FDIS Report on voting
86B/3394/FDIS 86B/3438/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.

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SIST EN 61300-3-38:2012
– 6 – 61300-3-38 © IEC:2012
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.

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SIST EN 61300-3-38:2012
61300-3-38 © IEC:2012 – 7 –
FIBRE OPTIC INTERCONNECTING DEVICES
AND PASSIVE COMPONENTS –
BASIC TEST AND MEASUREMENT PROCEDURES –

Part 3-38: Examinations and measurements –
Group delay, chromatic dispersion and phase ripple



1 Scope
This part of IEC 61300 describes the measurement methods necessary to characterise the
group delay properties of passive devices and dynamic modules. From these measurements
further parameters like group delay ripple, linear phase deviation, chromatic dispersion,
dispersion slope, and phase ripple can be derived. In addition, when these measurements are
made with resolved polarization, the differential group delay can also be determined as an
alternative to separate measurement with the dedicated methods of IEC 61300-3-32.
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 61300-3-29, 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
3 Terms and abbreviations
For the purposes of this document, the terms and definitions given in IEC 60050-731 and
IEC 61300-3-29 apply, together with the following.
BW Bandwidth: the spectral width of a signal or filter.
CD Chromatic dispersion (in ps/nm): change of group delay over wavelength:
CD=d(GD)/dλ
D Detector
DGD Differential group delay (in ps): difference in propagation time between two
orthogonal polarization modes
DUT Device under test
DWDM Dense wavelength division multiplexing
δ Step size of the VWS during a wavelength swept measurement
f Modulation frequency
RF
GD Group delay (in ps): time required for a signal to propagate through a device
GDR Group delay ripple (in ps): the amplitude of ripple of GD
LN LiNbO
3

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SIST EN 61300-3-38:2012
– 8 – 61300-3-38 © IEC:2012
LPV Linear phase variation (in deg)
λ Centre channel or nominal operating wavelength for a component
c
MPS Modulation phase shift
PBS Polarising beam splitter
PMD Polarization mode dispersion (in ps): average value of DGD over wavelength
PPS Polarization phase shift
PSP Principle state of polarization
Φ Phase delay
RBD Reference branching device
SOP State of polarization
SSE Source spontaneous emission
SWI Swept wavelength interferometry
∆θ Phase ripple
TDC Tunable dispersion compensator
TJ Temporary joint
TLS Tunable laser source
VWS Variable wavelength source
4 General description
This document covers transmission measurements of the group delay properties of passive
devices and dynamic modules. In order to interpret the group delay properties, it is essential
to also have the amplitude spectral measurement available. For this reason, loss
measurements are also covered to the extent that they are required to make proper
dispersion measurements.
The methods described in this procedure are intended to be applicable in any wavelength
band (C, L, O, etc.) although examples may be shown only in the C band for illustrative
purposes.
This document is separated into two sections, one concentrating on measurement methods,
and one concentrating on analysis of the measurement data. The measurement methods
covered in this document are the modulation phase shift method, the swept-wavelength
interferometry method and the polarization phase shift method. The modulation phase shift
method is considered the reference method. The methods are selected particularly because of
their ability to provide spectrally resolved results, which are often necessary for passive
components and especially for wavelength-selective devices.
The appropriate measurement parameter to evaluate the group delay ripple, and the method
of estimating the phase ripple from the measurement result of GDR are shown in 7.4. The
phase ripple is important as a measure of the influence that GD of an optical device has on
the transmission quality since many tunable dispersion compensators use the interference
effect where ripple is a significant effect.

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SIST EN 61300-3-38:2012
61300-3-38 © IEC:2012 – 9 –
5 Apparatus
5.1 Modulation phase shift method
5.1.1 General
The measurement set-up for the characterisation of the group delay (GD) properties of optical
components is shown in Figure 1. A detailed
...