1、BSI Standards Publication Guidance of measurement methods and test procedures Basic tests for polarization- maintaining optical fibres PD IEC/TR 62349:2014National foreword This Published Document is the UK implementation of IEC/TR 62349:2014. It supersedes PD IEC/TR 62349:2005 which is withdrawn. T
2、he UK participation in its preparation was entrusted by Technical Committee GEL/86, Fibre optics, to Subcommittee GEL/86/1, Optical fibres and cables. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all t
3、he necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2014. Published by BSI Standards Limited 2014 ISBN 978 0 580 79541 1 ICS 33.180.10 Compliance with a British Standard cannot confer immunity from legal obligations. This Publis
4、hed Document was published under the authority of the Standards Policy and Strategy Committee on 28 February 2014. Amendments/corrigenda issued since publication Date Text affected PUBLISHED DOCUMENT PD IEC/TR 62349:2014 IEC TR 62349 Edition 2.0 2014-02 TECHNICAL REPORT Guidance of measurement metho
5、ds and test procedures Basic tests for polarization-maintaining optical fibres INTERNATIONAL ELECTROTECHNICAL COMMISSION T ICS 33.180.10 PRICE CODE ISBN 978-2-8322-1396-4 Registered trademark of the International Electrotechnical Commission Warning! Make sure that you obtained this publication from
6、an authorized distributor. colour inside PD IEC/TR 62349:2014 2 TR 62349 IEC:2014(E) CONTENTS FOREWORD . 4 1 Scope and object . 6 2 Normative references 6 3 Terms and definitions 6 4 Testing conditions . 7 5 Guidance for dimensional characteristics measurement of polarization-maintaining optical fib
7、res 7 5.1 Object 7 5.2 Overview of method . 7 5.3 Reference test method . 8 6 Guidance for cut-off wavelength measurement of polarization-maintaining optical fibres . 8 6.1 Object 8 6.2 Overview of method . 8 7 Guidance for mode field diameter measurement of polarization-maintaining optical fibres .
8、 8 7.1 Object 8 7.2 Overview of method . 8 8 Guidance for beat length measurement of polarization-maintaining optical fibres . 9 8.1 Object 9 8.2 Overview of methods . 9 8.3 Reference test method . 9 8.4 Specimen . 9 8.5 Beat length measuring method . 9 Method A: Phase beat length measurement method
9、 . 9 8.5.1Method B: Group beat length measurement method . 12 8.5.2 8.6 Results 12 Information available with each measurement . 12 8.6.1Information available upon request . 13 8.6.2 9 Guidance for polarization crosstalk measurement of polarization-maintaining optical fibres 13 9.1 Object 13 9.2 Pol
10、arization crosstalk measuring method . 13 General 13 9.2.1Method A: Power ratio method 13 9.2.2Method B: In-line polarimetric method . 15 9.2.3 Annex A (informative) Cut-off wavelength of PM fibre and SM fibre Profiles and bend dependence of cut-off wavelength . 17 Annex B (informative) Difference o
11、f beat length by measurement method 19 B.1 Modal birefringence and beat length 19 B.2 Beat length defined by Method B . 19 Annex C (informative) Electromagnet for Faraday rotation . 22 Bibliography 23 PD IEC/TR 62349:2014TR 62349 IEC:2014(E) 3 Figure 1 Apparatus of beat length measurement Method A .
12、 10 Figure 2 Example of measurement profile by electro magnet . 11 Figure 3 Example of test apparatus for polarization crosstalk measurement (power ratio method) 14 Figure 4a Front view of data arc and fitted circle 16 Figure 4b 90 Rotated cutaway view defining the geometrical relationships 16 Figur
13、e 4 Poincar sphere representations for Method B . 16 Figure A. 1 Cut-off wavelength profiles of PM fibre and SM fibre 17 Figure A. 2 Cut-off wavelength profile of PM fibre with extra bending . 17 Figure C. 1 A schematic of the electromagnet 22 PD IEC/TR 62349:2014 4 TR 62349 IEC:2014(E) INTERNATIONA
14、L ELECTROTECHNICAL COMMISSION _ GUIDANCE OF MEASUREMENT METHODS AND TEST PROCEDURES BASIC TESTS FOR POLARIZATION-MAINTAINING OPTICAL FIBRES FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committ
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24、n. 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 pa
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26、e “state of the art“. IEC/TR 62349, which is a technical report, has been prepared by subcommittee 86A: Fibres and cables, of IEC technical committee 86: Fibre optics. This second edition cancels and replaces the first edition published in 2005. It constitutes a technical revision. In this edition,
27、guidance of measurement methods and test procedures for dimensional characteristics, cut-off wavelength, mode field diameter and beat length of polarization- maintaining optical fibres have been added. Thus, the title of the technical report is changed to “Guidance of measurement methods and test pr
28、ocedures Basic tests for polarization- maintaining optical fibres” from “Guidance for polarization crosstalk measurement of optical fibre”. PD IEC/TR 62349:2014TR 62349 IEC:2014(E) 5 The text of this technical report is based on the following documents: Enquiry draft Report on voting 86A/1488/DTR 86
29、A/1507/RVC Full information on the voting for the approval of this technical report 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. The committee has decided that the contents of this publication
30、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. A bilingual version of this publication
31、 may be issued at a later date. 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 publication using a colour printer. PD IEC/TR
32、 62349:2014 6 TR 62349 IEC:2014(E) GUIDANCE OF MEASUREMENT METHODS AND TEST PROCEDURES BASIC TESTS FOR POLARIZATION-MAINTAINING OPTICAL FIBRES 1 Scope and object This technical report applies to polarization-maintaining (PM) optical fibres. The object of this report is to define test procedures to b
33、e used in establishing uniform requirements for the geometrical and transmission properties of PM fibres. 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
34、 cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60068-1, Environmental testing Part 1: General and guidance IEC 60793-1-20:2001, Optical fibres Part 1-20: Measurement methods and test procedures Fibre geometry IEC 60793-1-
35、44, Optical fibres Part 1-44: Measurement methods and test procedures Cut- off wavelength IEC 60793-1-45:2001, Optical fibres Part 1-45: Measurement methods and test procedures Mode field diameter IEC 60793-1-48, Optical fibres Part 1-48: Measurement methods and test procedures Polarization mode dis
36、persion 3 Terms and definitions For the purposes of this document, the following ters and definitions apply. NOTE IEC 60793-1-11 1provides general definitions for testing. 3.1 polarization-maintaining optical fibre PM fibre optical fibre capable of transmitting, under external perturbations such as
37、bending or lateral pressure, both independently of or either of the polarization modes HE X 11and HE Y 11whose directions of electric field vector intersect orthogonally with each other and which have different propagation constants . _ 1Numbers in square brackets refer to the bibliography. PD IEC/T
38、R 62349:2014TR 62349 IEC:2014(E) 7 3.2 phase beat length one cycle of the periodical coupled polarization state by the phase difference of two linear- polarization modes intersecting orthogonally in the PM fibre Note 1 to entry: Small beat length results in high polarization maintaining capability 3
39、.3 group beat length one cycle of the periodical coupled polarization state by the group delay difference of two linear-polarization modes intersecting orthogonally in the PM fibre Note 1 to entry: Small beat length results in high polarization maintaining capability. 3.4 polarization crosstalk stre
40、ngth of coupling of the two polarization modes intersecting orthogonally with each other within a polarization-maintaining optical fibre, representing the ratio in optical strength exiting the fibre of one polarization mode launched at the input end to the optical power of the other polarization mod
41、e exiting the fibre when only the former polarization mode is excited (see also 9.2.2.4.2) 4 Testing conditions Unless otherwise specified, the test is conducted under the standard conditions specified in IEC 60068-1. However, when it is difficult to make measurements in the standard conditions, the
42、 test can be conducted in conditions other than the standard conditions provided that no doubts will arise about judgments. 5 Guidance for dimensional characteristics measurement of polarization- maintaining optical fibres 5.1 Object Clause 5 describes measurement methods and test procedures for the
43、 dimensional characteristics of uncoated PM optical fibres. 5.2 Overview of method This technical report gives measurement methods for dimensional characteristics of PM fibre which are given in terms of the following parameters: cladding diameter; cladding non-circularity; core concentricity error.
44、Two methods are described for measuring dimensional characteristics of PM fibre: Method A: Refracted near-field; Method B: Grey-scale technique of near-field light distribution. Information pertaining to each individual method is given in Annexes A and C of IEC 60793-1- 20:2001. Only notes for PM fi
45、bre are described below. For a general optical fibre, a circle-fitting is used to determine the core centre. However, as for the PM fibre, in particular the elliptical core PM fibre, the core centre cannot be determined if an ellipse-fitting is not used, because the fibre has an oval core. PD IEC/TR
46、 62349:2014 8 TR 62349 IEC:2014(E) 5.3 Reference test method Method B is the reference test method (RTM), which is the one used to settle disputes. 6 Guidance for cut-off wavelength measurement of polarization-maintaining optical fibres 6.1 Object Clause 6 describes a measurement method and a test p
47、rocedure for the cut-off wavelength, cof PM fibres. 6.2 Overview of method The measurement method in this technical report describes procedures for determining the cut-off wavelength of a sample fibre in a short length, uncabled and primary coated condition ( c ). Information pertaining to each indi
48、vidual method is given in IEC 60793-1-44. Only notes for PM fibre are described below. As shown in Annex A, the cut-off wavelength of the PM fibre is measured paying attention to excite a LP 11mode sufficiently and not to impose an extra, small bending more carefully than the cut-off wavelength meas
49、urement of a single-mode (SM) optical fibre. The recommended deployment configuration of the sample fibre is as defined for the fibre cut- off wavelength in IEC 60793-1-44. 7 Guidance for mode field diameter measurement of polarization-maintaining optical fibres 7.1 Object Clause 7 describes measurement methods and test procedures for the mode field diameter (MFD) of PM fibres. 7.2 Overview of method Three methods are described for measuring
