1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-23449-2 SANS 62000:2010Edition 1 IEC/TR 62000:2005Edition 1SOUTH AFRICAN NATIONAL STANDARD Single-mode fibre compatibility guidelines This
4、 national standard is the identical implementation of IEC/TR 62000:2005 and is adopted with the permission of the International Electrotechnical Commission. Published by SABS Standards Division 1 Dr Lategan Road Groenkloof Private Bag X191 Pretoria 0001Tel: +27 12 428 7911 Fax: +27 12 344 1568 www.s
5、abs.co.za SABS SANS 62000:2010 Edition 1 IEC/TR 62000:2005 Edition 1 Table of changes Change No. Date Scope National foreword This South African standard was approved by National Committee SABS TC 79, Fibre Optics, in accordance with procedures of the SABS Standards Division, in compliance with anne
6、x 3 of the WTO/TBT agreement. This SANS document was published in January 2010. TECHNICALREPORT IECTR 62000First edition2005-11Single-mode fibre compatibility guidelines PRICE CODE IEC 2005 Copyright - all rights reservedNo part of this publication may be reproduced or utilized in any form or by any
7、 means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Electrotechnical Commission, 3, rue de Varemb, PO Box 131, CH-1211 Geneva 20, SwitzerlandTelephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmailiec.ch
8、Web: www.iec.chJFor price, see current catalogueCommission Electrotechnique InternationaleInternational Electrotechnical CommissionF_ m gZ j hgZy We_dl j hl_ogbq_kdZy DhfbkkbySANS 62000:2010This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS . 2 T
9、R 62000 IEC:2005(E) CONTENTS FOREWORD.31 Scope.52 Acronyms .63 System issues 64 Fibre issues64.1 Cut-off wavelength 64.2 Splicing issues 74.3 Combination of fibre parameters: chromatic dispersion coefficient and slope, polarization mode dispersion (PMD). .74.4 Non-linear effects75 Launch fibres, pig
10、tails, patch-cords and jumper cables .86 Summary8Bibliography9SANS 62000:2010This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .TR 62000 IEC:2005(E) 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ SINGLE-MODE FIBRE COMPATIBILITY GUIDELINES FOREWOR
11、D 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 electr
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19、or any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) andexpenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications. 8) Attention is drawn to the Nor
20、mative 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 resp
21、onsible for identifying any or all such patent rights. The main task of IEC technical committees is to prepare International Standards. However, a technical committee may propose the publication of a technical report when it has collected data of a different kind from that which is normally publishe
22、d as an International Standard, for example “state of the art“. IEC 62000, which is a technical report, has been prepared by subcommittee 86A: Fibres and cables, of IEC technical committee 86: Fibre optics. The text of this technical report is based on the following documents: Enquiry draft Report o
23、n voting 86A/1022/DTR 86A/1026/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. SANS 62000:2010This s tandard may only b
24、e used and printed by approved subscription and freemailing clients of the SABS . 4 TR 62000 IEC:2005(E) 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 rel
25、ated 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 may be issued at a later date. SANS 62000:2010This s tandard may only be used and printed by approved subscription and fr
26、eemailing clients of the SABS .TR 62000 IEC:2005(E) 5 SINGLE-MODE FIBRE COMPATIBILITY GUIDELINES 1 Scope This technical report provides guidelines indicating the items that should be taken into account when planning to connect a) different implementations of single-mode fibres of the same type, e.g.
27、 different implementations of type B single-mode fibres, and b) single-mode fibres of different types, e.g. B1.1 with B4. See IEC 60793-2-50 for the attributes and definitions of single-mode fibres, summarised in Table 1 below. A given type of single-mode fibre, for example B4, may have different im
28、plementations by suitably optimising several of the following parameters: mode field diameter (hence effective area), chromatic dispersion coefficient, slope of the chromatic dispersion curve and cable cut-off wavelength. Table 1 Attributes and definitions of single-mode fibres Common name Use (IEC
29、60793-2-50) IEC category/ type ITU-T Recommendation Dispersion unshifted single-mode fibre Optimised for use in the 1 310 nm region but can be used in the 1550 nm region B1.1 G.652 A, B Cut-off shifted single-mode fibre Optimised for low loss in the 1 550 nm region, with cut off wavelength shifted a
30、bove the 1 310 nm region B1.2 G.654 Extended band dispersion unshifted single-mode fibre Intended to extend the range of possible transmission signals, using 1 310 nm band power budgets, to portions of the band above 1 360 nm and below 1 530 nm B1.3 G.652 C, D Dispersion shifted single-mode fibre Op
31、timised for single channel transmission in the 1 550 nm region. Multiple channels can only be transmitted if care is taken to avoid the effects of four wave mixing by, for example, moderating the power levels or appropriate spacing or placement of the channels B.2 G.653 Non-zero dispersion-shifted s
32、ingle-mode fibre Optimised for multiple channel transmission in the 1 550 nm region with a cut off wavelength that may be shifted above the 1 310 nm region B4 G.655 Wideband non-zero dispersion-shifted single-mode fibre Optimised for multiple channel transmission in the wavelength range of 1 460 nm
33、1625 nm with the positive value of the chromatic dispersion coefficient that is greater than some non-zero value over the same wavelength range. B5 G.656 NOTE The ITU-T recommendation references are for information. There can be slight variations in these requirements due to the evolution of standar
34、ds over time. This technical report does not consider the connection of fibres with the same implementation from different manufacturers, which is already considered by the standardisation procedure. SANS 62000:2010This s tandard may only be used and printed by approved subscription and freemailing
35、clients of the SABS . 6 TR 62000 IEC:2005(E) 2 Acronyms For the purposes of this document, the following acronyms apply. OTDR: Optical Time Domain Reflectometer PMD: Polarisation Mode Dispersion DWDM: Dense Wavelength Division Multiplexing NRZ: Non-Return to Zero RZ: Return to Zero 3 System issues T
36、he different characteristics of B type fibres can be explicitly combined to optimise system performance in terms of the dispersion characteristics (global dispersion coefficients, slope) of the link. It is in fact possible to combine fibres with an opposite sign of the dispersion coefficient in a gi
37、ven wavelength range to bring the total link dispersion to near-zero in that range. The final result will however depend on the accuracy of individual fibre dispersion measurements and the ability to match lengths. The process of combining fibres with different dispersion coefficient characteristics
38、 can be one of the ways to make dispersion management in a transmission line (the most common one being the periodical insertion of dispersion compensating modules) Combining fibres with a different effective area is also a possible way to minimise the overall impact of non-linear effects. For insta
39、nce, it is possible to place large effective area fibres in the initial section of a link, where the propagating power is relatively large. In this case, the large core reduces the associated non-linear effects. For link sections away from the source, where power levels are reduced, fibres with smal
40、ler effective area may be used, to take advantage of a possible reduction of the dispersion slope or to increase the efficiency of Raman amplification. The relative size and placement of fibres with large effective area vs. fibres with smaller effective area are critical issues in system design. Spl
41、ice loss considerations (see section 4.2) should also be taken into account when fibres with different effective area or mode field diameter are combined. 4 Fibre issues 4.1 Cut-off wavelength Different fibres have been historically developed for operation in different wavelength ranges: they can th
42、erefore have different cut-off wavelengths. If the source wavelength is below the cut-off wavelength, undesirable multi-modal propagation could occur. It is however to be considered that the cut-off wavelength is reduced after cabling and installation. The amount of the reduction depends on the refr
43、active index profile, i.e. on the fibre type. If fibre cut-off wavelength is specified, it can be assumed that, after cabling and installation, the cut-off will be down shifted by several tens of nanometers (depending on the fibre type). Cable cut-off wavelength is therefore specified in individual
44、standards. See IEC 60793-2-50 and IEC 60793-1-44. These considerations should be applied when connecting different fibre types, e.g. type B4 with B1, in order to avoid multimodal operation and noise, which could affect the system performance, depending on the source wavelength. SANS 62000:2010This s
45、 tandard may only be used and printed by approved subscription and freemailing clients of the SABS .TR 62000 IEC:2005(E) 7 4.2 Splicing issues The very different mode field diameter ranges for the different fibre categories in the family specifications of 60793-2-50 have an effect on splice loss whe
46、n fibres of different categories are spliced together. Care must be taken to properly adjust splicing equipment and to correctly evaluate the splicing losses among different fibre families, which can show very large increases in comparison with conventional splice losses. The optimal set-up paramete
47、rs of fusion splicers are not the same for the different types of fibres (e.g. B1 versus B4 fibres) or combinations of different implementations of fibres. Another factor that has to be taken into account when using an OTDR to measure the splice loss across fibres with different mode field diameters
48、 is that the bidirectional method is strictly required. The mismatch of mode fields can make a splice appear to have much more loss from one direction than the other. Negative loss, or “gain” can also be apparent with uni-directional OTDR measurements. See IEC TR 62316 for more information. When usi
49、ng an OTDR to measure the distance between splices of various sections of fibre with different mode field diameters, the apparent distance can be different than the actual distance because the group velocity for the different fibres may not be the same. For accurate length measurements, the OTDR length calibration setting must be adjusted according to the section and type of fibre that is present. 4.3 Combination of fibre parameters: chromatic dispersion coefficient and slope, pol
