ITU-T L 68-2007 Optical fibre cable maintenance support monitoring and testing system for optical fibre cable networks carrying high total optical power (Study Group 6)《负载全部高光能的光纤光.pdf
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1、 International Telecommunication Union ITU-T L.68TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (10/2007) SERIES L: CONSTRUCTION, INSTALLATION AND PROTECTION OF CABLES AND OTHER ELEMENTS OF OUTSIDE PLANT Optical fibre cable maintenance support, monitoring and testing system for optical fibre cable
2、networks carrying high total optical powerITU-T Recommendation L.68 ITU-T Rec. L.68 (10/2007) i ITU-T Recommendation L.68 Optical fibre cable maintenance support, monitoring and testing system for optical fibre cable networks carrying high total optical power Summary ITU-T Recommendation L.68 descri
3、bes the functional requirements for optical fibre cable maintenance systems for optical fibre cable carrying a high total optical power. It also considers safety procedures and guidelines for the maintenance of outside optical fibre plant carrying a high total optical power. Source ITU-T Recommendat
4、ion L.68 was approved on 22 October 2007 by ITU-T Study Group 6 (2005-2008) under the ITU-T Recommendation A.8 procedure. ii ITU-T Rec. L.68 (10/2007) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and
5、 communication technologies (ICTs). The ITU Telecommunication 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 bas
6、is. The World Telecommunication Standardization Assembly (WTSA), 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 Resol
7、ution 1. In some areas of information technology which fall within 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
8、and a recognized operating agency. Compliance with this Recommendation 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 m
9、et. The words “shall“ or some other obligatory language such 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 RIGHTS ITU draws attention to the possi
10、bility that the practice or implementation of this Recommendation 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 R
11、ecommendation development process. As of the date of approval 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 informa
12、tion and are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2008 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. ITU-T Rec. L.68 (10/2007) iii CONTENTS Page 1 S
13、cope 1 2 References. 1 3 Definitions 2 4 Abbreviations 2 5 Fundamental requirements for optical fibre cable maintenance systems for optical fibre cable carrying high total optical power 2 6 System requirements for optical fibre cable maintenance systems for optical fibre cable carrying high total op
14、tical power 2 6.1 Connection for optical fibre cable carrying high total optical power. 3 6.2 Termination for optical fibre cable carrying high total optical power . 3 6.3 Testing access modules for optical fibre carrying high total optical power. 4 6.4 Optical switch for optical fibre cable carryin
15、g high total optical power 4 7 Testing and maintenance procedure . 4 Appendix I Japanese experience: Catastrophic damage and destructive process induced in optical fibre cord by high power pump light 5 I.1 Introduction 5 I.2 Experiments exposing optical fibre cords to high power . 5 I.3 Destructive
16、process. 7 I.4 Conclusion 7 Appendix II Japanese experience: Ignition induced by a high power light input at a butt-joint splice with refractive index matching material 8 II.1 Introduction 8 II.2 Experiments on high power light at a butt-joint splice. 8 II.3 Observation of ignition caused by high po
17、wer light input . 9 II.4 Conclusion 10 Bibliography. 11 iv ITU-T Rec. L.68 (10/2007) Introduction Broadband optical access services are now commercially available. The number of FTTx subscribers is increasing rapidly. Trunk line communication traffic is also growing quickly due to the expansion of F
18、TTx services. To meet the demand for increased transmission capacity, wavelength division multiplexing (WDM) and distributed Raman amplifier (DRA) technologies have been employed in trunk line transmission systems, and consequently high power communication signals and high pump powers have been intr
19、oduced into optical fibre cables. If we are to maintain the optical cable networks reliably, we must study optical fibre cable maintenance systems that can be applied to optical fibre cable carrying a high total optical power. Recently, the optical power in optical communication systems has been inc
20、reasing rapidly through the use of WDM or distributed Raman amplification technologies. When DRA technology is applied to WDM systems, a high power light is launched into optical fibres and fibre-optic components. The intensity of that optical power reaches several watts, and such a high power light
21、 may induce damage in optical fibres or fibre-optic components. During maintenance work, network operators must handle optical fibres or fibre-optic components carefully in central offices that employ high power systems with a view to preventing accidental eye or fire hazards. Since the light with t
22、he highest optical power is launched into the optical fibre distribution systems and the maintenance systems in a central office, we must clarify the effect that it has on the fibre-optic components in these systems. ITU-T Rec. L.68 (10/2007) 1 ITU-T Recommendation L.68 Optical fibre cable maintenan
23、ce support, monitoring and testing system for optical fibre cable networks carrying high total optical power 1 Scope This Recommendation describes the functional requirements of optical fibre cable maintenance systems for optical fibre cable carrying a high total optical power. It applies to test eq
24、uipment, optical switches for selecting a test fibre, test access modules for connecting test equipment to the communication line, testing optical fibre cords and optical connecting devices that are contained in the maintenance system. It also considers safety procedures and guidelines for the maint
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