1、BSI Standards Publication Optical amplifiers Part 4: Maximum permissible optical power for the damage-free and safe use of optical amplifiers, including Raman amplifiers PD IEC/TR 61292-4:2014National foreword This Published Document is the UK implementation of IEC/TR 61292-4:2014. It supersedes PD
2、IEC/TR 61292-4:2010 which is withdrawn. The UK participation in its preparation was entrusted by Technical Committee GEL/86, Fibre optics, to Subcommittee GEL/86/3, Fibre optic systems and active devices. A list of organizations represented on this committee can be obtained on request to its secreta
3、ry. This publication does not purport to include all the 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 83187 4 ICS 33.160.10; 33.180.30 Compliance with a British St
4、andard cannot confer immunity from legal obligations. This Published Document was published under the authority of the Standards Policy and Strategy Committee on 30 November 2014. Amendments/corrigenda issued since publication Date Text affected PUBLISHED DOCUMENT PD IEC/TR 61292-4:2014IEC TR 61292-
5、4 Edition 3.0 2014-10 TECHNICAL REPORT Optical amplifiers Part 4: Maximum permissible optical power for the damage-free and safe use of optical amplifiers, including Raman amplifiers INTERNATIONAL ELECTROTECHNICAL COMMISSION V ICS 33.160.10 33.180.30 PRICE CODE ISBN 978-2-8322-1907-2 Registered trad
6、emark of the International Electrotechnical Commission Warning! Make sure that you obtained this publication from an authorized distributor. colour inside 2 IEC TR 61292-4:2014 IEC 2014 CONTENTS FOREWORD . 4 INTRODUCTION . 6 1 Scope and object . 7 2 Normative references 7 3 Abbreviated terms . 8 4 M
7、aximum transmissible optical power to keep fibres damage-free . 8 4.1 General . 8 4.2 Fibre fuse and its propagation . 9 4.3 Loss-induced heating at connectors or splices 10 4.4 Connector end-face damage induced by dust/contamination . 11 4.5 Fibre-coat burn/melt induced by tight fibre bending . 13
8、4.6 Summary of the fibre damage . 14 5 Maximum transmissible optical power to keep eyes and skin safe . 15 5.1 Maximum transmissible exposure (MPE) on the surface of eye and skin . 15 5.2 Maximum permissible optical power in the fibre for the safety of eye and skin. 15 General . 15 5.2.1Need for APR
9、 17 5.2.2Wavelengths 17 5.2.3Locations . 17 5.2.4Nominal ocular hazard distance (NOHD) 17 5.2.5Power reduction times . 17 5.2.6Medical aspects of the safety of eyes and skin in existing standards . 18 5.2.7 6 Maximum optical power permissible for optical amplifiers from the viewpoint of fibre damage
10、 as well as eye and skin safety 19 7 Conclusion 19 Annex A (informative) General information for optical fibre fuse . 20 A.1 Introduction . 20 A.2 Generating mechanism . 20 A.3 Figure A.3 Calculated fibre fuse propagation behaviour simulated with the SiO absorption modelVoid formation mechanism 23 A
11、.4 Propagation characteristic of a fibre fuse 24 A.5 Prevention and termination . 26 A.5.1 General . 26 A.5.2 Prevention methods . 26 A.5.3 Termination methods . 26 A.6 Conclusion 29 Bibliography 30 Figure 1 Experimental set-up for fibre fuse propagation . 9 Figure 2 Connection loss versus temperatu
12、re increase 11 Figure 3 Test set-up . 11 Figure 4 Surface condition contaminated with metal filings, before the test 12 Figure 5 Variation of the power attenuation during the test at several power input values for plugs contaminated with metal filings 13 Figure 6 Polishing surface condition contamin
13、ated with metal filing, after the test 13 PD IEC/TR 61292-4:2014IEC TR 61292-4:2014 IEC 2014 3 Figure 7 Thermo-viewer image of tightly-bent SMF with optical power of 3 W at 1 480 nm 14 Figure 8 Temperature of the coating surface of SMFs against bending with optical power of 3 W at 1 480 nm . 14 Figu
14、re 9 Maximum permissible power in the fibre against APR power reduction time . 18 Figure A.1 Front part of the fibre fuse damage generated in the optical fibre 20 Figure A.2 SiO absorption model . 22 Figure A.3 Calculated fibre fuse propagation behaviour simulated with the SiO absorption modelVoid f
15、ormation mechanism . 23 Figure A.4 Series of optical micrographs showing damage generated by 9,0 W 1 480 nm laser light suggesting a mechanism of periodic void formation . 24 Figure A.5 Images of fibre fuse ignition taken with an ultra-high speed camera and an optical micrograph of the damaged fibre
16、. 25 Figure A.6 Power density dependence of the fibre-fuse propagation velocity . 25 Figure A.7 Optical micrographs showing front part of the fibre fuse damage generated in SMF-28 fibres with various laser intensities (1 480 nm) 26 Figure A.8 Principle of the optical fibre fuse passive termination m
17、ethod and photograph of the fibre fuse terminator which adopted TEC structure . 27 Figure A.9 Photograph of hole-assistant fibre and fibre fuse termination using a hole- assistant fibre . 28 Figure A.10 Example of fibre fuse active termination scheme . 29 Figure A.11 Transformation of electric signa
18、l by optical fibre fuse 29 Table 1 Threshold power of fibre fuse propagation for various fibres 9 Table 2 Measurement conditions 10 Table 3 Examples of power limits for optical fibre communication systems having automatic power reduction to reduce emissions to a lower hazard level 16 Table 4 Locatio
19、n types within an optical fibre communication system and their typical installations . 17 PD IEC/TR 61292-4:2014 4 IEC TR 61292-4:2014 IEC 2014 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ OPTICAL AMPLIFIERS Part 4: Maximum permissible optical power for the damage-free and safe use of optical amplifi
20、ers, including Raman amplifiers 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 c
21、oncerning 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)”).
22、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 collaborat
23、es 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
24、 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
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27、s 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 I
28、EC 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 e
29、xpenses 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) A
30、ttention 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. The main task of IEC technical committees is to prepare International Standards. However, a tec
31、hnical committee may propose the publication of a technical report when it has collected data of a different kind from that which is normally published as an International Standard, for example “state of the art“. IEC TR 61292-4, which is a technical report, has been prepared by subcommittee 86C: Fi
32、bre optic systems and active devices, of IEC technical committee 86: Fibre optics. This third edition cancels and replaces the second edition, published in 2010, and constitutes a technical revision with updates reflecting new research in the subject area. PD IEC/TR 61292-4:2014IEC TR 61292-4:2014 I
33、EC 2014 5 The text of this technical report is based on the following documents: Enquiry draft Report on voting 86C/1158/DTR 86C/1200/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 b
34、een drafted in accordance with the ISO/IEC Directives, Part 2. A list of all parts in the IEC 61292 series, published under the general title, Optical amplifiers, can be found on the IEC website. The committee has decided that the contents of this publication will remain unchanged until the stabilit
35、y 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 may be issued at a later date. IMPORTAN
36、T 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. PD IEC/TR 61292-4:2014 6 IEC TR 61292-4:2014 IEC 2014
37、INTRODUCTION This technical report is dedicated to the subject of maximum permissible optical power for damage-free and safe use of optical amplifiers, including Raman amplifiers. Since the technology is quite new and still evolving, amendments and new editions to this report can be expected. Many n
38、ew types of optical amplifiers are entering the marketplace and research is also stimulating many new types of fibre and non-fibre based optical amplifier research. With the introduction of such technologies as long-haul, over 40 Gb/s, WDM transmission and Raman amplification, some optical amplifier
39、s may involve optical pump sources with extremely high optical power up to, possibly, several watts. Excessively high optical power may cause physical damage to the fibres/optical components/equipment as well as present medical danger to the human eye and skin. The possibility of fibre damage caused
40、 by high optical intensity has recently been discussed at some technical conferences. The use of high intensity optical amplifiers may cause problems in the fibre such as a fibre fuse, a heating in the splice point (connection point), and the fibre end-face damage due to dust and the fibre coat burn
41、ing due to tight fibre bending. IEC SC 86A (Fibres and cables) has published IEC TR 62547, and SC 86B (Fibre optic interconnecting devices and passive components) has published IEC TR 62627-01. IEC TC 31 (Equipment for explosive atmospheres) is also discussing the risk of ignition of hazardous envir
42、onments by radiation from optical equipment. Medical aspects have long been discussed at standards groups. IEC TC 76 (Optical radiation safety and laser equipment) precisely describes in IEC 60825-2 the concept of hazard level and labelling and addresses the safety aspects of lasers specifically in
43、relation to tissue damage. ITU-T Study Group 15 (Optical and other transport networks) has published Recommendation G.664, which primarily discusses the automatic laser power reduction functionality for safety. With the recent growth of interest in fibre Raman amplifiers, however, some difficulties
44、have been identified among optical amplifier users and manufacturers in fully understanding the technical details and requirements across all such standards and agreements. This technical report provides a simple informative guideline on the maximum optical power permissible for optical amplifiers f
45、or optical amplifier users and manufacturers. PD IEC/TR 61292-4:2014IEC TR 61292-4:2014 IEC 2014 7 OPTICAL AMPLIFIERS Part 4: Maximum permissible optical power for the damage-free and safe use of optical amplifiers, including Raman amplifiers 1 Scope and object This part of IEC 61292, which is a tec
46、hnical report, applies to all commercially available optical amplifiers (OAs), including optical fibre amplifiers (OFAs) using active fibres, as well as Raman amplifiers. Semiconductor optical amplifiers (SOAs) using semiconductor gain media are also included. This technical report provides a simple
47、 informative guideline on the threshold of high optical power that causes high-temperature damage of fibre. Also discussed is optical safety for manufacturers and users of optical amplifiers by reiterating substantial parts of existing standards and agreements on eye and skin safety. To identify the
48、 maximum permissible optical power in the optical amplifier from damage-free and safety viewpoints, this technical report identifies the following values: a) the optical power limit that causes thermal damage to the fibre, such as fibre fuse and fibre-coat burning; b) the maximum permissible exposur
49、e (MPE) to which the eyes/skin can be exposed without consequential injury; c) the optical power limit in the fibre that causes MPE on the eyes/skin after free-space propagation from the fibre; d) the absolute allowable damage-free and safe level of optical power of the optical amplifier by comparing (a) and (c). The objective of this technical report is to minimize potential confusion and misunderstanding in the industry that might cause unnecessary alarm and hinder t
