1、ANSI/TIA/EIA-455-18O-A-I999 Approved: November 29,1999 TIAIEIA STANDARD FOTP480 Measurement of the Optical Transfer Coefficients of a Passive Branching Device (Coupler) TIAEIA -455- 180-A (Revision of EIATIA-455-180) DECEMBER 1999 TELECOMMUNICATIONS INDUSTRY ASSOCIATION Representing the telecommunic
2、ations industry in association with the Electronic Industries Alliance Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NOTICE TiAEIA Engineering Standards and Publications are d
3、esigned 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 minimum delay the proper product for his particular need. Existenc
4、e 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 Standards and Publications preclude their voluntary use by those other t
5、han TiAEIA members, whether the standard is to be used either domestically or internationally. Standards and Publications are adopted by TiAEIA in accordance with the American National Standards Institute (ANSI) patent policy. By such action, TiAEIA does not assume any liability to any patent owner,
6、 nor does it assume any obligation whatever to parties adopting the Standard or Publication. 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
7、 safety and health practices and to determine the applicability of regulatory limitations before its use. (From Standards Proposal No. 4536, formulated under the cognizance of the TIA FO-6.3 Subcommittee on Fiber Optic Interconnecting Devices.) Published by TELECOMMUNICATIONS INDUSTRY ASSOCIATION 19
8、99 Standards and Technology Department 2500 Wilson Boulevard Arlington, VA 22201 PRICE: Please refer to current Catalog of PUBLICATIONS or call Global Engineering Documents, USA and Canada (1-800-854-7179) International (303-397-7956) EIA ELECTRONIC INDUSTRIES ALLIANCE STANDARDS and ENGINEERING All
9、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-,-,-Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for
10、 ResaleNo reproduction or networking permitted without license from IHS-,-,-TIA/EIA-455- 180-A FOTP- 180 MEASUREMENT OF THE OPTICAL TRANSFER COEFFICIENTS OF A PASSIVE BRANCHING DEVICE (COUPLER) CONTENTS Section Method 2 is applicable to Class A, B and C devices, but is less precise than Method 1 bec
11、ause it introduces the unknown loss of a TJ. 10 Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TIA/EIA-455-180-A DEVICE UNDER TEST LAUNCH DETECTOR r r r O O r O O For multimode
12、 devices, four measurement conditions are allowed as specified in Table 1. The letter Y refers to restricted and the letter “o“ refers to overfilled. The designations under the heading “Device Under Test“ spec conditions for the Pl(h) measurement and those for the Po(h) measurement. REFERENCE LAUNCH
13、 DETECTOR r r r O O O O O Table 2. Measurement Conditions for Multimode Branching Devices 5.1.1.1 Method 1 (Cutback) - Class A Branching Device 1) The selected input and output ports of the BD are connected to the measurement setup as shown in Figure 7. Refer to 3.2.2.1. The lengths of the input por
14、t (Ll) and output port (L2) shall be specified in the Detail Specification, but shall be sufficiently short that the signal attenuation over the stated lengths is insignificant by comparison to the insertion loss of the BD. To avoid measurement errors, the fiber ends at the TJ shall not be displaced
15、 during the measurement process of Pl(h) . The power Pl(h) at the detector(D) is then recorded for each wavelength of interest. The power level shall be repeatable when the fiber is withdrawn and recoupled to the detector. 2) After ensuring that the measurement of Pl(h) is sufficiently stable, the f
16、iber between the TJ and the BD is cut as shown in Figure 8. The length of the cutback section (Ll) shall be 1 to 2 meters (3 to 6 ft) or as specified in the relevant Detail Specification. 11 Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo repr
17、oduction or networking permitted without license from IHS-,-,-TIA/EIA-455- 180-A Note: (Figure 8) If a cladding mode stripper was initially placed on the input port it shall also be included and remain undisturbed in the cutback section (Ll). Also, if a high order mode filter was initially placed on
18、 the input port, it shall also be included and remain undisturbed in the cutback section (Ll). 3) The BD and its pigtail fibers are removed from the test setup. The free end of the fiber, which was connected to the input port, is then coupled to the detector as shown in Figure 9. 4) The power Po for
19、 all other applications, the following information is not required to be reported but shall be available for review and inspection on request. 7.2.1 Description of equipment used; manufacturer and model number. 7.2.2 Date of latest equipment calibration and calibration data. 7.2.3 Description of sou
20、rce. 7.2.4 Description of excitation unit. 7.2.5 Description of cladding mode strippers and index matching fluid used. 7.2.6 Detection and recordingtechniques. 7.2.7 The following information shall be reported and available only for U.SD. military applications. 7.2.7.1 Test personnel. 15 Copyright T
21、elecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TIA/EIA-455- 180-A 8. SPECIFICATION INFORMATION The following details shall be specified in the Detail Specification: 8.1 Test procedure and
22、 launch / detector conditions. This can be specified in the same manner as suggested in 7.1.1. 8.2 Test limits, acceptance and failure criteria. 8.3 Number and type of samples to be tested. 8.4 Fiber pigtail and / or connector interface requirements. 8.5 Test wavelengths. 8.6 Cutback length, if othe
23、r than 1 or 2 meters (3 to 6 ft.) 8.7 Other test conditions. 16 Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TIA/EIA-455-180-A - EMEU - (a) Class. A BD TJ “ Mode Scrambler or
24、 Beam Optics (b) Class B & C S Input LQTl Mode Scrambler or Beam Optics FIGURE 1: OVERFILLED LAUNCH OF MLJLTIMODE BRANCHING DEVICE PORT (a) Class A S (b) Class B & C Input Port F-l FIGURE 2: RESTRICED LAUNCH OF MLJLTIMODE BRANCHING DEVICE INPU PORT 17 Copyright Telecommunications Industry Associatio
25、n Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TIA/EIA-455- 180-A S (a) Class A - BD Mode Filter - Mode Filter at Either End (a) Class B & C Input Port n (a) Class A FIGURE 3: MATCHED BEAM EXClTATION FOR SINGLE MODE Mode Fil
26、ter u (b) Class B & C Connector I Mode Filter FIGURE 4 - DETECTION UNTI FOR RESTRICTED MULTIMODE PORT a) Class A (b) Class B & C o Connector cl FIGURE 5 - DETECTOR UNTI FOR OVERFILLED MULTIMODE CONDlTION 18 Copyright Telecommunications Industry Association Provided by IHS under license with EIANot f
27、or ResaleNo reproduction or networking permitted without license from IHS-,-,-TIA/EIA-455-180-A (a) Class A (b) Class B & C PO Mode Filter Connector Mode Filter FIGURE 6 - DETECTION UIVI FOR SINGLE-MODE PORT (a) Multimode Input L1 (b) Singlemode Mode Input Filter Port n L1 output L2 output Mode Filt
28、er Port FIGURE 7 - METHOD 1 (CUTBACK) STEP 1 19 Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TIA/EIA-455- 180-A BD - (a) Multimode Cut Input D Output Disconnect TJ (b) Single
29、mode Clit MODE FETER DISCONNECT FIGURE 8 - METHOD 1 (CUTBACK) STEP 2 (a) Multimode L1 (b) Singlemode L1 FIGURE 9 - METHOD 1 (CUTBACK) STEP 3 20 Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without licens
30、e from IHS-,-,-TIA/EIA-455-180-A Port (a) Class A Port BD D - Input output - BD D - S L1 L2 - - BD D - - (b) Class B & C FIGURE 1OA - METHOD 2 (SUBSTITUTION) STEP 1 MULTIMODE (a) Class A Mode Filter Either Place Input Port output Mode Filter Port (a) Class B & C 21 Copyright Telecommunications Indus
31、try Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TIA/EIA-455- 180-A (a) Class A Is (b) Class B & C E Input $47 Disconnect L1 Input Port output Port L2 El Disconnect output Port LI Disconnect Disconnect FIGURE 11A
32、 - METHOD 2 (SUBSTITUTION) STEP 2 MULTIMODE (a) Class A Mode filter either place output port Mode filter 0,lO - L2 - Disconnect Disconnect (b) Class B & C Input output Mode filter port Mode filter 1) Disconnect Disconnect Li FIGURE 11B - METHOD 2 (SUBSTITUTION) STEP 2 SINGLE-MODE 22 Copyright Teleco
33、mmunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TIA/EIA-455-180-A IDI Class A Substitute (a) Class B & C (a) Class A FIGURE 12A METHOD 2 (SUSSTlTUTION) STEP 3 MULTIMODE Substitute Fibers (b) Cl
34、ass B & C FIGURE 12B METHOD 2 (SUSSTlTUTION) STEP 2 SINGLE-MODE 23 Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
