ANSI EIA TIA 455-42A-1989 Optical Crosstalk in Fiber Optic Components《光纤元件中串光》.pdf

1、- ,IND-STD ANSI/EIA TIA- 455-42 REV A-9 N I 60 m 9999998 0004742 L m - ADOPTION NOTICE 1 18 January 1991 fop ANSI/EIA/TIA-455-42A-89 20 October 1989 ANSI/EIA/TIA-455-42A-89 was adopted on l8 January the Department of Defense (DoD). The indicated industry group has furnished the clearance required by

2、 existing regulations. tho DoD Single Stock Point, Naval Publieations and Forms Center, 8801 Tabor Avenue, Philadelphia, PA 19120, for issue to DoD activities only, All other requestors must obtain documents from: and is approved for use by Copies of the document are stocked by The Electronic Indust

3、ries Association 2001 Eye Street, NW Washington, DC 20006 Title of Document: Date of Specific Issue Adopted: 20 October 1989 Optical Crosstalk in Fiber Optic Components Releasing Non-Government Standards Body: Tho Electronics Industrieg Association Acceptance of this FOTP does not imply that referen

4、ced FOTPe have been accepted. NOTICE: When reaffirmation, amendment, revision, or cancellation of this otandard is initially proposed, the industry group responsible for this standard shall inform the military coordinating activity of the proposed change and request participation. Cue todians : Army

5、 - CR Navy - AS Air Force - 85 Review activities: Army - MI, TE Navy - EC, MC, .SH Air Force - 11, 17, lS, 80, 90, SrS DLA - ES GSA - FSS .C OUSD - SD User activities: Air Force - 13, 14 AMSC N/A DISTRIBUTION STATEMENT A: Approv Military Coordinating Activity: Army - CR Agent: DLA - ES (Project 6OGP

6、-0201-1) i for publie r-leas FSC 6oa distribution is unlimited. Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,- EIA TIA-455-42A 89 3234b00 0009292 7 = /-=- ANSI/ EIAI TIA- 4 5

7、5-42 A- 198 9 APPROVED: October 20, 1989 EIA/TIA STANDARD FOTP-42 Optical Crosstalk in Fiber Optic Components E IA/TIA=455=42A (Revision of EIA-455-42) NOVEMBER 1989 ELECTRONIC IN BUSTRI ES ASSOCIATION ENGINEERING DEPARTMENT TEL ECOMMUNICA TIONS - -r INUSTi Y ASSOCIATION Copyright Telecommunications

8、 Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-i EIA TIA-455-42A 89 3234600 0009293 9 W L- o Q NOTICE EIA/TIA Engineering Standards and Publications are designed to serve the public interest through elimi

9、nating misunderstandings between manufacturers and purchasers, facilitating interchangeability and improvement of products, and assisting the purchaser in selecting and obtaining with minimum delay the proper product for his particular need. Existence of such Standards and Publications shall not in

10、any respect preclude any member or nonmember of EIA/TIA from manufacturing or selling products not conforming to such Standards and Publications, nor shall the existence of such Standards and Publications preclude their voluntary use by those other than EIA/TIA members, whether the standard is to be

11、 used either domestically or internationally. Recommended Standards and Publications are adopted by EIA/TIA without regard to whether or not their adoption may involve patents on articles, materials, or processes. By such action, EIA/TIA does not assume any liability to any patent owner, nor does it

12、 assume any obligation whatever ta parties adopting the Recommended Standard or Publication. This EIA/TIA Standard is considered to have International Standardization implication , but the International Electrotechnical Commission activity has not progressed to the point where a valid comparison bet

13、ween the EIA/TIA Standard and the IEC document can be made. 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

14、to determine the applicability of regulatory limitations before its use. e Copyright 1989 Published by ELECTRON IC IN DUSTRI ES ASSOCIATION Engineering Department 2001 Pennsylvania Ave, N.W. Washington, D.C. 20006 (Temporary Headquarters 1722 Eye St., N.W. Washington, D.C. 20006) PRICE: $1 0.00 All

15、rights reserved Printed in U.S.A. Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,- h. EIA TIA-455-42A 89 m 3234600 0009294 O m EIA/TIA-455-42A Page 1 OPTICAL CROSSTALK FOTP - 4

16、2 IN FIBER OPTIC COMPONENTS (From EIA Standards Proposal No. 2159, formulated under the cognizance of TIA FO-6.4, Subcommittee on Fiber Optic Test Methods and Instrumentation.). This FOTP is part of the series of test procedures included within Recommended Standard EIA/TIA-455. NOTE: This FOTP was o

17、riginally published in EIA-455-42 as FOTP-42. 1.0 SCOPE The intent of this procedure is to determine the crosstalk ratios between any two optical paths in a cable, connectsrized cable, splice or similar device. In addition, the devices contribution to the crosstalk in a system,may be determined. The

18、 effectiveness of the material surrounding the optical conducting device in restricting light paths to other elements may also be measured. However, note that the test methods of FOTP-180 should be used to measure crosstalk in fiber optic couplers (branching devices) and in similar devices of this c

19、lass. 2.0 REFERENCED DOCUMENTS Test or inspection requirements may include, but are not limited to, the following references: FOTP-57 (EIA-455-57) ffOptical Fiber End Preparation and Examinationff FOTP-180 (PN-2142) “Measurement of the Optical Transfer Coefficients of a Passive Branching Device ( Co

20、upler) f1 0 This FOTP will be published at a future date. Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,- * i. EIA TIA-455-42A 89 m 3234600 0009295 2 EIA/TIA-455-42A Page 2 3.0

21、 TEST 3.1 3.2 3.3 EQUIPMENT Optical Power Source A noncoherent light source full width half maximum (FWHM) greater than 40 nm operating at a specified wavelength or with a spectral range that covers the wavelengths of systems operation shall be used. The source stability and spectral width shall be

22、as specified in the Detail Specification. The source shall be of sufficient intensity to produce a light level at the exit of the source fiber that is at least 40 dB above the noise Eloor of the detection system. Launch Optics Unless otherwisk specified, the launch optics shall be such than anoverfi

23、lled launch condition is obtained. , Detector A detector which is linear (within 5%) over the range of radiation intensity shall be used. The detector shall be capable.of capturing the entire output of the fiber. A lock-in amplifier type system, or equivalent, shall be used because of the low level

24、signals on the test;fiber, O 4. O TEXT .SAMPLE 4.1 The test sample shall be one of the following (seeFigures 1 and 2): 4.1.1 If the test sample is to be a cable only, the test sample shall consist of 20 f: 2 meters (65.6 f: 6.6 feet) of a representative section of the specified cable/fiber combinati

25、on. If the test sample is to be a connecting device only, the test sample shall be a representative specimen of the specified connecting device. The fibers/cables to be used in the connecting device shall be specified in the Detail Specification. .: 4.1.2 4.1.3 If the test sample is to be a cable/fi

26、ber/ connscting device combination, both the cable/fiber combination and the connecting device(s) shall be representative specimens. The cable shall be of sufficient length such that after the connecting device is inserted in the middle, there will still be 20 f 2 meters (65.6 t- 6.6 feet) of the ca

27、ble between the launch and detection ends of the cable. Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,- EIA TIA-455-42A 7 M 3234600 0007296 4 M EIA/TIA-455-42A Page 3 4.2 Sampl

28、e Packaging The sample shall be suspended in a manner which relieves tension and minimizes fiber microbending. Unless otherwise specified, no external microbending shall intentionally be introduced. 4.3 Sample Preparation Remove the cable jacketing from both ends of each length of any cable used in

29、this test. The amount of jacketing removed or cut back shall be sufficient (a) to allow necessary preparation of all cable ends (refer to FOTP-57 or to other instructions as appropriate) and (b) to allow , the launch or detection of the signal or the installation of a connecting device. Alternativel

30、y, appropriately terminated (connectorized) cables of proper length may be used in lieu of these cutback operations. 5.0 PROCEDURE 5.1 The following values are measured or calculated in this procedure: = input power to source/reference fiber (measured at output end), r = far end output power from th

31、e test fiber, = near end output power from the test fiber. pf b = far end output power of the test fiber, connecting device in line. fi = near end output power of the test fiber, connecting device in line. bi = far end crosstalk of the connecting device. CTfi = near end crosstalk of the connecting d

32、evice. CTbi 5.2 Position the cable sample and place the source and detecting fiber ends in end-positioning equipment. With the exception of the launch fiber, the termini of all fibers in each of the test cables shall be mounted on a detector. If a connecting device is used, all ports shall have fibe

33、rs attached, each of which lead to detectors. For this test, all adjacent paths shall be used for testing devices and cables. Refer to Figures 1 and 2 for test Set-ups. Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking

34、 permitted without license from IHS-,-,-,. 0. EIA TPA-455-42A 89 = 3234b00 0009297 b EIA/TIA-455-42A Page 4 5.3 The detector(s) shall be placed at the detection end(s) of the fiber(s) under test so that the entire signal exiting the fiber is received by the detectr. If more than one detector is used

35、, the additional detectors shall be calibrated against the primary detector, a reference detector, or a standard source. A lock-in amplifier type system, or equivalent, shall be used to isolate test sources from background noise (room lighting). 5.4 The input end of the source/reference fiber shall

36、be aligned so that maximum power is received at the output end (P ) ; measure and xecord P maximum. The output of the so6rce fiber shall be at legst 40 dB above the noise floor of the detection system. 5.5 Align. the ends of the test fiber to the detectors so that maximum signal is detected; measure

37、 and record the power levels, Pb and Pf. 5.6 If a connecting device is not being tested, omit steps 5.7 and 5.8 and proceed immediately to step 5.9. To evaluate connecting devices, continue the procedure with steps 5.7 and 5.8. 5.7 For evaluation of connecting devices only, insert the connecting dev

38、ice in the middle of the cable without altering the source launch conditions. (Ref er to Figure 2. ) 5.8 Align the ends of the test fiber to the detector so that maximum:signal power is detected; measure and.record the power levels, Pbi and Pfi. 5.9 Calculate the inherent far end and near end crssta

39、lk for the cable (or cable and connector assembly) under test using the measurements made in steps 5.4 through 5.8 and the calculation methods of Section 6 following. 6.0 CALCULATIONS 6.1 Using the following formula, calculate the inherent far end crosstalk, CTf, and the inherent near end crosstalk,

40、 CTb, of the cable sample: where terms are as defined in 4.1. Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-EIA TIA-455-42A 89 = 3234b00 0009278 8 EIA/TIA-455-42A Page 5 6.2 U

41、sing the following formula, calculate the far end crosstalk, CT ., and the near end crosstalk, CTbi, of the connecting dedlce : CTfi (dB) = -10 loglo(Pfi - Pf)/Prl where terms are as defined in 4.1. (Assumes insertion loss through the connecting device is equivalent for both fibers.) 7.0 DOCUMENTATI

42、ON 7.1 The following information shall be reported for each test: 7.1.1 Title and date of test procedure. 7.1.2 Identification of the fiber optic component under test (eng., source fiber, test fiber, cable, connector, etc.). 7.1.3 7.1.4 Correlation of test results and fibers used. Measured power val

43、ues (Pr, Pf, Pbf Pfi, and Phi) 7.1.5 Calculated crosstalk values (CTf, CTb, CTfi, and 7.2 United States military applications require that the following information be reported for each test; for other applications, this information need not be reported but shall be available for review upon request

44、: bi)* I 7.2.1 Test Personnel (military applications only). 7.2.2 Test equipment used and date of latest calibration. 7.2.3 Identification of test methods or procedures used. Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or netw

45、orking permitted without license from IHS-,-,-EIA TIA-455-42A 9 m 3234b00 000929% T m EIA/TIA-455-42A Page 6 8.0 SPECIFYING INFORMATION The following details- shall be specified in the individual Detail Specification: 8.1 Type of fiber optic component to be tested. 8.2 Test cond%tions: 8.2.1 Tempera

46、ture. 82.2, Spectral .width of the source. 8.2.3 8.2.4 Number and location (e.g., adjacent) of fibers Test wavelengths. s to be measured for each cable. 8.2.5 Units of reported results. 8.2.6 If required, length of cable sample. 12 1- , 8.3 Acceptance criteria: F 8 :3.1 .Maximum .allowable crosstalk

47、 ip dB. 1.- , .c ci A*. . . 7 a Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. ;- EIA TIA-455-42A 89 3234600 0007300 2 EIA/TIA-455-42A Page 7 /Source Launch Optics and Light

48、Chopper (if used) e/ Reference Detector Assem blies 20 f 2 Meters FIGURE 1 Test Sample Light Tight Launch Optics and connectorl -Connect or Aaaembl ea 20 f 2 Metera Enclosure FIGURE 2 Test Sample With Connecting Device Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-