TIA TSB62-5-1995 ITM-5 Characterization of Attenuation Uniformity of Optical Fiber《ITM-5 光纤的衰减一致性特性》.pdf
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1、TIA/EIA TELECOMMUNICATIO SYSTEMS BULLETIN VS ITM-5 Characterization of Attenuation Uniformity of Optical Fibers TSB62-5 AUGUST 1995 (Reaffirmed September 2001) TELECOMMUNICATIONS INDUSTRY ASSOCIATION The Telmmmmicationu Indwtry Association repramis the nnimunicatiom wdor of Electronic indu6tries All
2、iance NOTICE TIA/EIA Engineering Standards and Publications are designed to serve the public interest through eliminating misunderstandings between manufacturers and purchasers, facilitating interchangeability and improvement of products, and assisting the purchaser in selecting and obtaining with m
3、inimum delay the proper product for his particular need. Existence of such Standards and Publications shall not in any respect preclude any member or nonmember of TIA/EIA from manufacturing or selling products not conforming to such Standards and Publications, nor shall the existence of such Standar
4、ds and Publications preclude their voluntary use by those other than TIA/EIA members, whether the standard is to be used either domestically or internationally. Standards, Publications and Bulletins are adopted by EIA in accordance with the American National Standards Institute (ANSI) patent policy.
5、 By such action, TIA/EIA does not assume any liability to any patent owner, nor does it assume any obligation whatever to parties adopting the Standard, Publication, or Bulletin. Technical Bulletins are distinguished from TIA/EIA Standards or Interim Standards, in that they contain a compilation of
6、engineering data or information useful to the technical community, and represent approaches to good engineering practices that are suggested by the formulating committee. This Bulletin is not intended to preclude or discourage other approaches that similarly represent good engineering practice, or t
7、hat may be acceptable to, or have been accepted by, appropriate bodies. Parties who wish to bring other approaches to the attention of the formulating committee to be considered for inclusion in future revisions of this Bulletin are encouraged to do so. It is the intention of the formulating committ
8、ee to revise and update this Bulletin from time to time as may be occasioned by changes in technology, industry practice, or government regulations, or for other appropriate reasons. (From Project No. 3-3440-RF1, formulated under the cognizance of the TIA FO-6 Committee on Fiber Optics and the TIA F
9、O-6.6 Subcommittee on Optical Fibers.) This Document was reaffirmed by the Telecommunications Industry Association on September 14,2001. Published by TELECOMMUNICATIONS INDUSTRY ASSOCIATION 1995 Standards and Technology Department 2500 Wilson Boulevard Arlington, VA 22201 PRICE: Please refer to the
10、current Catalog of ELECTRONIC INDUSTRIES ALLIANCE STANDARDS and ENGINEERING PUBLICATIONS or call Global Engineering Documents, USA and Canada (1-800-854-7179) International (303-397-7956) All rights reserved Printed in U.S.A. ITM 5 Characterization of Attenuation Uniformity of Optical Fiber CONTENTS
11、 1 . Introduction . 1 2 . Normative references 2 3 . Apparatus 3 4 . Sampling and specimens 4 5 . Procedure 8 7 . Documentation 18 6 . Calculations and interpretation of results . 9 . Annex A Treatment of end effects . 19 Annex B GSW Algorithms 21 Annex C Filter definition and evaluation . 24 Annex
12、D Applications . 30 Annex E Comparison with IEC or ITU tests . 32 I EIA TSB62-5 95 3234600 0562806 T4 TINE IA-TSB-62-5 This page left blank. II TI NE I A-TS B-6 2- 5 ITM 5 Characterization of Attenuation Uniformity of Optical Fiber Foreword This document comes from TIA Project No. 3440, and was form
13、ulated under the cognizance of TIA FO-6.6 Subcommittee on Optical Fibers and Cables, and TIA FO-6.6.5, Working Group on Single-mode Measurements of Optical Fiber. This ITM is part of the series of informative test methods included within TINEIA TSB-62. There are five annexes, all of which are inform
14、ative. Key words: attenuation, uniformity, OTDR, . III EIA TSBb2-5 95 m 3234600 0562832 241 m TINE IA-TSB-62-5 This page left blank. iv EIA TSBb2-5 95 W 3234600 0562830 477 W ITM-5 Characterization of Attenuation Uniformity of Optical Fiber 1 Introduction 1.1 Intent This document is intended to exte
15、nd the use of OTDRs, see FOI rs 59, 60, and 61, to quantitatively characterize the uniformity of the attenuation coefficient of optical fibers. Each has particular utility under certain circumstances but none can be considered as universally optimal. The choice of a particular method will depend on
16、details of the agreement between the buyer and seller. Several methods are defined in this document. 1.2 Scope This document is restricted to the use of bi-directional OTDR traces which are required for accurate attenuation values. The document defines terminology that is used to describe several me
17、thods of characterizing attenuation uniformity. It outlines some of the details about identifying start and end locations on unidirectional traces so that the bi-directional average can be computed. The document provides guidelines on the evaluation of the quality of digital filters 1.3 Background T
18、he functional requirements on attenuation uniformity differ substantially, depending on considerations such as: - Fiber transfer to cabler Length of fiber - Cable transfer to distributor - Cable transfer to end user Length of cables and cable count - End user evaluation of installation or maintenanc
19、e records - Quality of OTDR and method of operation - Computational power and data storage A single, universally satisfactory, method is not possible. 1.4 Other This document follows a worst-case methodology. That is, a maximum value is the usual outcome of a definition. If only a worst case value i
20、s used, the user cannot derive the benefit of the portions of the fiber that are better than the worst 1 EIA TSBb2-5 95 3234b00 O562809 757 TINE IA-TSB-62-5 case. Other methodologies, such as statistical, may be more effective. These methods might incorporate some of the methods in this document, au
21、gmented with other, more complete information. 2 Normative references FOTP-59 (TINEIA-455-59A) Measurement of fiber point discontinuities using an OTDR FOTP-60 (TINEIA-455-60A) Measurement of fiber or cable length using an OTDR FOTP-61 (TINEIA-455-61 A) Measurement of fiber or cable attenuation usin
22、g an OTDR 3 Apparatus FOTP-61 contains the equipment requirements for measuring attenuation uniformity. 4 Sampling and specimens The mathematics of this section are used to provide consistent definitions for use in the other sections of the document. Many alternative and equivalent expressions might
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