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1、 TIA TELECOMMUNICATIONS SYSTEMS BULLETIN Optical Return Loss Meters - Measurement and Application Issues TSB-142 September 2005 TELECOMMUNICATIONS INDUSTRY ASSOCIATION The Telecommunications Industry Association represents the communications sector of Copyright Telecommunications Industry Associatio
2、n Provided by IHS under license with EIALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/29/2007 21:32:38 MDTNo reproduction or networking permitted without license from IHS -,-,- NOTICE TIA Engineering Standards and Publications are designed to serve the public interest throu
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6、 This Standard does not purport to address all safety problems associated with its use or all applicable regulatory requirements. It is the responsibility of the user of this Standard to establish appropriate safety and health practices and to determine the applicability of regulatory limitations be
7、fore its use. (From Standards Proposal No. 3-0065-B, formulated under the cognizance of the TIA FO-4.5 Subcommittee on Fiber Optic Metrology.) Published by TELECOMMUNICATIONS INDUSTRY ASSOCIATION Standards and Technology Department 2500 Wilson Boulevard Arlington, VA 22201 U.S.A. PRICE: Please refer
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21、communications Industry Association Provided by IHS under license with EIALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/29/2007 21:32:38 MDTNo reproduction or networking permitted without license from IHS -,-,- TSB-142 Optical Return Loss Meters Measurement and Application
22、Issues Contents 1 Scope.3 1.1 Optical Return Loss and Reflectance.4 2 Measuring Optical Return Loss and Reflectance.5 2.1 The Continuous Wave (CW)-Based Instrument6 2.2 Optical Time Domain Based Instruments .8 2.2.1 Time Domain Based Instruments Measuring Backscatter.8 2.2.2 Time Domain Based Instru
23、ments Not Considering Backscatter10 3 Measurement Limitations and Applications11 3.1 General and Definitions11 3.2 Application Issues Using the OCWR Method .12 3.3 Application Issues Using Time Domain Based Return Loss Meters.15 3.3.1 OTDR (Backscatter Method).15 3.3.2 OTDR (Reflective Event Compari
24、son Method)20 4 Calibration Issues and Industry Status.22 4.1 Reference Cables / Reference Jumpers.24 5 References.25 5.1 Informative References 25 5.2 Other References.25 Copyright Telecommunications Industry Association Provided by IHS under license with EIALicensee=IHS Employees/1111111001, User=
25、Wing, Bernie Not for Resale, 03/29/2007 21:32:38 MDTNo reproduction or networking permitted without license from IHS -,-,- TSB-142 2 Figures Figure 1: Visualization of Reflectance with A) pulsed Optical Time Domain Reflectometry; Tektronix, Inc.; 1997. (Section 7.5.1) (dB) with a level of confidence
26、 of 95 % UB0.859= Expanded uncertainty of Backscatter coefficient: UB2 uB:= uB0.43= uBcBNAuNA ()2 cBn1un1 ()2 +cBsus ()2 +:= cBs17.372=cBs s BnsNA n1,s, () d d := cBn15.917=cBn1 n1 BnsNA n1,s, () d d := cBNA66.815= cBNA NA BnsNA n1,s, () d d := BnsNA n1,s, () 10 log NA n1 2 s 4.55 0.0001 := us 8.3 1
27、00 s:=uNA 2.69 100 NA:= un1 0.03 100 n1:= NA0.13:= n11.468:=s0.25:= Assumed variations, as per Corning SMF-28 Specification Date Sheet, Corning Engineering Handbook (1994): NA = 0.13 2.69 % s = 0.25 dB/km 8.3 % n = 1.468 0.03 % Evaluation of the Backscatter coefficient uncertainty (Bns) as a functio
28、n of fiber parameters: numerical aperture (NA), index of refraction (n) and attenuation coefficient () Copyright Telecommunications Industry Association Provided by IHS under license with EIALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/29/2007 21:32:38 MDTNo reproduction o
29、r networking permitted without license from IHS -,-,- Copyright Telecommunications Industry Association Provided by IHS under license with EIALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/29/2007 21:32:38 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright Telecommunications Industry Association Provided by IHS under license with EIALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/29/2007 21:32:38 MDTNo reproduction or networking permitted without license from IHS -,-,-