1、 I n t e r n a t i o n a l T e l e c o m m u n i c a t i o n U n i o n ITU-T G.650.3 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (08/2017) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Transmission media and optical systems characteristics Optical fibre cables Test metho
2、ds for installed single-mode optical fibre cable links Recommendation ITU-T G.650.3 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNECTIONS AND CIRCUITS G.100G.199 GENERAL CHARACTERISTICS COMMON TO ALL ANALOGUE CARRIER-TRANSMISS
3、ION SYSTEMS G.200G.299 INDIVIDUAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON METALLIC LINES G.300G.399 GENERAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON RADIO-RELAY OR SATELLITE LINKS AND INTERCONNECTION WITH METALLIC LINES G.400G.449 COORDINATION OF RADIOTELEP
4、HONY AND LINE TELEPHONY G.450G.499 TRANSMISSION MEDIA AND OPTICAL SYSTEMS CHARACTERISTICS G.600G.699 General G.600G.609 Symmetric cable pairs G.610G.619 Land coaxial cable pairs G.620G.629 Submarine cables G.630G.639 Free space optical systems G.640G.649 Optical fibre cables G.650G.659 Characteristi
5、cs of optical components and subsystems G.660G.679 Characteristics of optical systems G.680G.699 DIGITAL TERMINAL EQUIPMENTS G.700G.799 DIGITAL NETWORKS G.800G.899 DIGITAL SECTIONS AND DIGITAL LINE SYSTEM G.900G.999 MULTIMEDIA QUALITY OF SERVICE AND PERFORMANCE GENERIC AND USER-RELATED ASPECTS G.100
6、0G.1999 TRANSMISSION MEDIA CHARACTERISTICS G.6000G.6999 DATA OVER TRANSPORT GENERIC ASPECTS G.7000G.7999 PACKET OVER TRANSPORT ASPECTS G.8000G.8999 ACCESS NETWORKS G.9000G.9999 For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T G.650.3 (08/2017) i Recommendation ITU-T
7、 G.650.3 Test methods for installed single-mode optical fibre cable links Summary Recommendation ITU-T G.650.3 outlines the tests normally carried out on installed single-mode optical fibre cable links. It includes a collection of references to the main measurement methods and gives an indication of
8、 which are most suitable for installed cable links, depending on the required inspection level. Optical fibre cable links are comprised of multiple cable sections, splices and other connections. This term is more completely defined in this Recommendation. This Recommendation uses a tiered approach.
9、The first level indicates measurements that are normally carried out to commission new optical fibre cable links. The second level indicates measurements that may be carried out to satisfy service level agreements (e.g., when a dark fibre contract is signed) or to verify attributes of older links th
10、at may be used at higher bit rates or over extended wavelength ranges. Recommendation ITU-T G.650.3 (2017) introduces the provision of information of splice loss measurement based on the quasi-bidirectional technique in Appendix IV. The method for differentiating splice loss and macrobending loss in
11、 installed links, which was issued as Amendment 1 to ITU-T G.650.3 (2008), is also included as Appendix III. History Edition Recommendation Approval Study Group Unique ID* 1.0 ITU-T G.650.3 2007-07-29 15 11.1002/1000/9180 2.0 ITU-T G.650.3 2008-03-29 15 11.1002/1000/9366 2.1 ITU-T G.650.3 (2008) Amd
12、. 1 2011-02-25 15 11.1002/1000/11326 3.0 ITU-T G.650.3 2017-08-13 15 11.1002/1000/13289 Keywords Fibre characterization, optical fibre cable link. _ * To access the Recommendation, type the URL http:/handle.itu.int/ in the address field of your web browser, followed by the Recommendations unique ID.
13、 For example, http:/handle.itu.int/11.1002/1000/11830-en. ii Rec. ITU-T G.650.3 (08/2017) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication technologies (ICTs). The ITU Telecommunication
14、 Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Assembly (WTS
15、A), which meets every four years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these topics. The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1. In some areas of information technology which fall w
16、ithin ITU-Ts purview, the necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. Compliance with this Recom
17、mendation is voluntary. However, the Recommendation may contain certain mandatory provisions (to ensure, e.g., interoperability or applicability) and compliance with the Recommendation is achieved when all of these mandatory provisions are met. The words “shall“ or some other obligatory language suc
18、h as “must“ and the negative equivalents are used to express requirements. The use of such words does not suggest that compliance with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTSITU draws attention to the possibility that the practice or implementation of this Recommend
19、ation may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approva
20、l of this Recommendation, ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementers are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB pat
21、ent database at http:/www.itu.int/ITU-T/ipr/. ITU 2017 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T G.650.3 (08/2017) iii Table of Contents Page 1 Scope . 1 2 References . 1 3 Definitions 2 3.1 Te
22、rms defined elsewhere 2 3.2 Terms defined in this Recommendation . 2 4 Abbreviations and acronyms 3 5 Conventions 3 6 Test methods . 3 6.1 Test methods for characteristics of optical fibre cable links following installation 3 6.2 Test methods for verification of service contracts or transmission at
23、particular bit rates . 6 Appendix I Optical time domain reflectometer trace analysis 9 I.1 Optical time domain reflectometer trace example 9 I.2 Optical time domain reflectometer event table example 9 I.3 Optical time domain reflectometer bidirectional trace analysis . 10 Appendix II Optical path pa
24、rameters specified in ITU-T Recommendations 13 Appendix III Method for differentiating splice loss and macrobending loss in installed links . 14 III.1 General . 14 III.2 Theory . 14 III.3 Considerations on practical applicability . 17 III.4 Measurement examples and influence of various conditions on
25、 measurement results . 17 Appendix IV Splice loss measurement using quasi-bidirectional technique 20 IV.1 Introduction 20 IV.2 Test method using quasi-bidirectional technique . 20 Bibliography. 25 Rec. ITU-T G.650.3 (08/2017) 1 Recommendation ITU-T G.650.3 Test methods for installed single-mode opti
26、cal fibre cable links 1 Scope This Recommendation describes test methods that are particularly suited to the characterization of single-mode optical fibre cable links. The methods are not intended for application to links that contain optical network elements, amplifiers, dispersion compensators, pa
27、ssive splitters or combiners. Measurements associated with these devices in combination with optical fibre cable are defined in ITU-T G.66x or ITU-T G.67x series Recommendations. These measurements of the cable links between such devices and the calculation methods for combining the results of conca
28、tenated cable links are also presented. This Recommendation uses a tiered approach. The first level indicates measurements that are normally carried out to commission new optical fibre cable links. The second level indicates measurements that may be carried out to satisfy service level agreements (e
29、.g., when a dark fibre contract is signed) or to verify attributes of older links that may be used at higher bit rates or over extended wavelength ranges. 2 References The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provis
30、ions of this Recommendation. At the time of publication, the editions indicated were valid. All Recommendations and other references are subject to revision; users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendation
31、s and other references listed below. A list of the currently valid ITU-T Recommendations is regularly published. The reference to a document within this Recommendation does not give it, as a stand-alone document, the status of a Recommendation. ITU-T G.650.1 Recommendation ITU-T G.650.1 (2010), Defi
32、nitions and test methods for linear, deterministic attributes of single-mode fibre and cable. ITU-T G.650.2 Recommendation ITU-T G.650.2 (2015), Definitions and test methods for statistical and non-linear related attributes of single-mode fibre and cable. ITU-T G.652 Recommendation ITU-T G.652 (2016
33、), Characteristics of a single-mode optical fibre and cable. ITU-T G.655 Recommendation ITU-T G.655 (2009), Characteristics of a non-zero dispersion-shifted single-mode optical fibre and cable. ITU-T G.657 Recommendation ITU-T G.657 (2016), Characteristics of a bending-loss insensitive single-mode o
34、ptical fibre and cable. ITU-T G.671 Recommendation ITU-T G.671 (2012), Transmission characteristics of optical components and subsystems. ITU-T G.957 Recommendation ITU-T G.957 (2006), Optical interfaces for equipments and systems relating to the synchronous digital hierarchy. IEC 60793-1-40 IEC 607
35、93-1-402001, Optical fibres Part 1-40: Measurement methods and test procedures Attenuation. IEC 61280-4-2 IEC 61280-4-2:2014, Fibre-optic communication subsystem test procedures Part 4-2: Installed cable plant Single-mode attenuation and optical return loss measurement. 2 Rec. ITU-T G.650.3 (08/2017
36、) IEC 61280-4-4 IEC 61280-4-4:2017, Fibre optic communication subsystem test procedures Part 4-4: Cable plants and links Polarization mode dispersion measurement for installed links. IEC 61281-1 IEC 61281-1 (1999), Fibre optic communication subsystems Part 1: Generic specification. IEC/TR 61282-7 IE
37、C/TR 61282-7:2003, Fibre optic communication system design guides Part 7: Statistical calculation of chromatic dispersion. IEC/TR 61282-9 IEC/TR 61282-9:2016, Fibre optic communication system design guides Part 9: Guidance on polarization mode dispersion measurements and theory. IEC 61300-3-6 IEC 61
38、300-3-6:2008, Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part 3-6: Examinations and measurements Return loss. IEC 61300-3-35 IEC 61300-3-35:2015, Fibre optic interconnecting devices and passive components Basic test and measurement procedures Par
39、t 3-35: Examinations and measurements Visual inspection of fibre optic connectors and fibre-stub transceivers. IEC/TR 61931 IEC/TR 61931 (1998), Fibre optic Terminology. 3 Definitions 3.1 Terms defined elsewhere This Recommendation uses the following terms defined elsewhere: 3.1.1 differential group
40、 delay (DGD): ITU-T G.650.2 3.1.2 fibre optic cable plant (FOCP): IEC 61281-1 3.1.3 fusion splice: IEC/TR 61931 3.1.4 mechanical splice: IEC/TR 61931 3.1.5 connector, fibre optic: IEC 61281-1 3.1.6 optical device: IEC 61281-1 3.1.7 optical return loss (ORL): IEC 61281-1 3.1.8 optical (fibre) splice:
41、 IEC/TR 61931 3.1.9 polarization mode dispersion (PMD): ITU-T G.650.2 3.1.10 reflectance: ITU-T G.671 3.2 Terms defined in this Recommendation This Recommendation defines the following terms: 3.2.1 attenuation of an optical fibre cable link: The summation of the attenuations of fibre cable sections,
42、 splices between cable sections and connections between, and at the end of, cable sections. The definition of attenuation is given in ITU-T G.650.1. Some examples of link attenuation measurement results are found in b-ITU-T G-Sup.39. 3.2.2 chromatic dispersion of an optical fibre cable link: The sum
43、mation of the chromatic dispersions of the individual cables that comprise the link at the wavelengths of interest. See b-ITU-T G-Sup.39 for more information on how the dispersion from different cable sections is summed. Rec. ITU-T G.650.3 (08/2017) 3 3.2.3 fibre characterization: A comprehensive su
44、ite of measurements that is carried out on an optical fibre cable link to determine the key performance attributes of that link that may affect current or future applications that operate over the link. Fibre characterization also allows the quality of the optical fibre cable link to be assessed, in
45、cluding the identification of the type and grade of fibre installed. Full fibre characterization includes connector end face inspection, insertion loss measurements, return loss measurements, optical time domain reflectometer (OTDR) testing, chromatic dispersion testing, polarization mode dispersion
46、 measurement and spectral attenuation. 3.2.4 single-mode optical fibre cable link: A collection of passive fibre optic components that together form a continuous optical fibre pathway between two end points. The end points will typically be patch panels or optical distribution frames where the fibre
47、s are terminated with connectors. The link will typically be comprised of many optical fibre cable sections, jointed end to end. A complex link may contain additional connectors at intermediate patch panels and therefore be made up of two or more concatenated simple links. 3.2.5 uniformity of fibre
48、link: The longitudinal variation in the attenuation coefficient or chromatic dispersion coefficient along that link. 4 Abbreviations and acronyms This Recommendation uses the following abbreviations and acronyms: BOTDA Brillouin Time Domain Analysis CD Chromatic Dispersion CWDM Coarse Wavelength Div
49、ision Multiplexing DFB Distributed Feedback DGD Differential Group Delay DWDM Dense Wavelength Division Multiplexing LSPM Light Source and Power Meter MFD Mode Field Diameter OCWR Optical Continuous-Wave Reflectometer ORL Optical Return Loss OTDR Optical Time Domain Reflectometer PMD Polarization Mode Dispersion 5 Conventions None. 6 Test methods 6.1 Test methods for characteristics of optical fibre cable links following installat
