1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationFibre optic interconnecting devices and passive components Basic test and measurement proceduresPart 3-38: Examinations and measurements Group delay, chromatic dispersion and pha
2、se rippleBS EN 61300-3-38:2012National forewordThis British Standard is the UK implementation of EN 61300-3-38:2012. It is identical to IEC 61300-3-38:2012.The UK participation in its preparation was entrusted by Technical Committee GEL/86, Fibre optics, to Subcommittee GEL/86/2, Fibre optic interco
3、nnecting devices and passive components.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards
4、Institution 2012Published by BSI Standards Limited 2012 ISBN 978 0 580 59513 4 ICS 33.180.10Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 September 2012.Ame
5、ndments issued since publicationAmd. No. Date Text affectedBRITISH STANDARDBS EN 61300-3-38:2012EUROPEAN STANDARD EN 61300-3-38 NORME EUROPENNE EUROPISCHE NORM August 2012 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komi
6、tee fr 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 ICS 33.180.10 English version Fibre optic interconnecting devices and p
7、assive 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 dinterconnexion et composants passifs fibres optiques - Procdures fondamentales dessais et de mesures - Partie 3-
8、38: Examens et mesures - Retard de groupe, dispersion chromatique et fluctuation de phase (CEI 61300-3-38:2012) Lichtwellenleiter -Verbindungselemente und passive Bauteile - Grundlegende Prf- und Messverfahren - Teil 3-38: Untersuchungen und Messungen - Gruppenlaufzeitverzgerung, chromatische Disper
9、sion 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 a
10、lteration. 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 langu
11、age 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
12、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
13、 Kingdom. BS EN 61300-3-38:2012EN 61300-3-38:2012 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 b
14、y CENELEC as EN 61300-3-38:2012. The following dates are fixed: latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2013-04-03 latest date by which the national standards conflicting with the document have
15、 to be withdrawn (dow) 2015-07-03 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 Sta
16、ndard 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.
17、IEC 61300-3-1 NOTE Harmonised as EN 61300-3-1. IEC 61300-3-32 NOTE Harmonised as EN 61300-3-32. BS EN 61300-3-38:2012EN 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,
18、 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 modi
19、fied 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 passive components -
20、 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 EN 61300-3-29 - BS EN 61300-3-38:201261300-3-38 IEC:2012 CONTENTS 1 Scope . . 7 2 Normative references . 7
21、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.
22、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
23、 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.
24、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 Measu
25、rement 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 BS EN 61300-3-38:201261300-3-38 IEC:2012 6.2.2 Te
26、st 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 relativ
27、e 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 differe
28、nce 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 disp
29、ersion 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 F
30、igure 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 G
31、Hz 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-channe
32、l-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 BS EN 61300-3-38:201261300-3-38 IEC:2012 Figure 13 Measured GD deviation of a fibre Bragg grating . . 30 Figure 14 Measured
33、 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 Poincar sphere 32 Figure A.2 DGD spectrum for a 50 GHz bandpass filte
34、r, 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 Ex
35、ample of Mueller set . 33 BS EN 61300-3-38:201261300-3-38 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 t
36、he 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 t
37、hese 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 d
38、ocument 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 commu
39、nication 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 Fo
40、r 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)/d D Detector DGD Differ
41、ential group delay (in ps): difference in propagation time between two orthogonal polarization modes DUT Device under test DWDM Dense wavelength division multiplexing Step size of the VWS during a wavelength swept measurement fRFModulation frequency GD Group delay (in ps): time required for a signal
42、 to propagate through a device GDR Group delay ripple (in ps): the amplitude of ripple of GD LN LiNbO3BS EN 61300-3-38:2012 8 61300-3-38 IEC:2012 LPV Linear phase variation (in deg) cCentre channel or nominal operating wavelength for a component MPS Modulation phase shift PBS Polarising beam splitte
43、r PMD Polarization mode dispersion (in ps): average value of DGD over wavelength PPS Polarization phase shift PSP Principle state of polarization Phase delay RBD Reference branching device SOP State of polarization SSE Source spontaneous emission SWI Swept wavelength interferometry Phase ripple TDC
44、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
45、 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
46、, 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
47、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 necessa
48、ry 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 in
49、fluence 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. BS EN 61300-3-38:201261300-3-38 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 explanation of the various components of thi
