1、ANSI/TIA/EIA-455-34A-l995 Approved: October 6, 1995 Reaffirmed: May 16, 2002 The Teleconmiunications Industry Association represents the conmiunications sector of Copyright Electronic Industries Alliance Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted with
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6、rements. 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 before its use. (From Standards Proposal No. 3-2936-RF1, formulated under the cognizance of the TIA FO-6.3 Subcommittee on
7、Interconnecting Devices and Passive Components.) This Document was reaffirmed by the American National Standards Institute (ANSI) on May 16,2002 and by the TIA. Published by TELECOMMUNICATIONS INDUSTRY ASSOCIATION 1995 Standards and Technology Department 2500 Wilson Boulevard Arlington, VA 22201 U.S
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19、 networking permitted without license from IHS-,-,-FOTP-34 Interconnection device insertion loss test Contents . Foreward III Introduction . 1 1 . 1 Intent . 1 1.2 Multimode methods . 1 1.3 Single mode method . 2 Normative references . 2 Apparatus . 3 3.1 Light source . 3 3.2 Source monitoring equip
20、ment 4 3.3 Cladding mode stripper . 4 3.4 High order mode filter 4 3.5 Mode filter 4 3.6 Detection equipment . 5 Sampling and specimens 5 4.1 Test sample . 5 4.3 Test sample length 5 4.4 Test sample deployment . 5 Procedures . 6 5.1 Procedure 1 . 6 5.2 Procedure 2 (for pigtailed devices) 6 5.3 Numbe
21、r of required readings . 7 Calculations or interpretation of results . 7 Documentation 8 Specification information . 9 Figure 1. Method AI . 10 Figure 3. Single mode method B 11 Figure 4. Method AI for pigtailed devices 11 Figure 5. Method A2 for pigtailed devices 12 Figure 2. Method A2 . 10 I Copyr
22、ight Electronic Industries Alliance Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Figure 6. Single Mode Method for pigtailed devices 12 Annex A (informative) . 13 Al . IEC 13 A2 . ITU-T . 13 II Copyright Electronic Industries
23、 Alliance Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-FOTP-34 Interconnection device insertion loss test Foreword (This Foreword is informative only and is not part of this Standard.) This document comes from TIA Project No
24、. 2936, and was formulated under the cognizance of TIA FO-6.3, Subcommittee on Fiber Optic Interconnection Devices. This FOTP is part of the series of test procedures included within Recommended Standard EIA/TIA-455. NOTE - This FOTP was originally published in EIA-455-34 as FOTP-34. There is one in
25、formative Annex. Key words: insertion loss, multimode, single mode, interconnection device . III Copyright Electronic Industries Alliance Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-This page left blank. iv Copyright Electr
26、onic Industries Alliance Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-1 Introduction 1.1 Intent This procedure defines a method by which the optical insertion loss of a complete fiber optic interconnection can be measured. T
27、here are two procedures that may be used. In the first, power is measured through a continuous length of fiber or cable. The fiberkable is then cut, the interconnection device is installed, and power is remeasured. In the second procedure, power is measured through a pigtailed device. The input fibe
28、rkable is then cut back and the power is remeasured. These procedures do not apply to cable assemblies. NOTE: The results of this test method are not directly comparable with those of FOTP-171 (a cable assembly test), which is sometimes used to evaluate connector loss. FOTP-34 tests a complete conne
29、ction (splice, device, connector set, etc.,) comprising normal parts. It deviates from normal use only in that loss is measured between two like fibers. FOTP-171 tests the interconnection loss of a normal part (half of a connection) mated with a reference quality part, which has been selected for ne
30、ar perfection of fiber and connector attributes. 1.2 Multimode methods This document contains two methods for multimode optical fiber interconnection devices, representing different mode volume conditions. One is a uniform modal excitation and detection condition, the other is one that restricts the
31、 excitation condition. 1.2.1 Method AI This method employs uniformly overfilled launching conditions, (defined in FOTP-54) and an unrestricted detection mode volume. It simulates insertion loss characteristics of interconnection devices consistent for use in short links using LED sources, such as LA
32、Ns, which substantially overfill the fiber. 1 Copyright Electronic Industries Alliance Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-1.2.2 Method A2 This method employs a mode filter in the test sample before the component un
33、der test. The intent is to simulate insertion loss characteristics of interconnection devices consistent for use in links with LED sources which do not overfill the fiber or links in which the launched power is substantially filtered by the link. 1.3 Single mode method Test Method B is for use with
34、single mode optical fiber 2 Normative references Test or inspection requirements and definitions may include, but are not limited to, the fol low i n g references : TIA/EIA-440-B Fiber opfic ferminology FOTP-54 (TIA/EIA-455-54B) Mode scrambler requiremenfs for overfilled launching condifions for mul
35、fimode fibers FOTP-57 (TIA/EIA-455-57B) Opfical fiber end preparafion and examinafion FOTP-77 (EIAITIA-455-77) Procedures fo qualify a higher-order mode filfer for measuremenfs on single mode fiber FOTP-171 (TIA/EIA-455-171 B) Affenuafion by subsfifufion measuremenf - for short- lengfh mulfimode gra
36、ded-index and single mode opfical fiber cable assemblies 2 Copyright Electronic Industries Alliance Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3 Apparatus Fiber type Class I and II (multimode) Class III (plastic) Class IVa
37、 single mode Class IVb single mode 3.1 Light source Center wavelength Spectral width 850+30 nm 1100 nm 660+30 nm 150 nm 1310+30 nm 1140 nm 1550+30 nm 1150 nm 3.1.1 Unless otherwise specified in the Detail Specification, use a light source that meets the fol Iowi ng req u ire men ts: 3.1.2 Methods AI
38、 and A2 shall provide a uniformly overfilled power distribution, as defined by FOTP-54, at point A as shown in Figures 1, 2, 4, and 5. For Method A2, point A is at the mode filter input. This may require the use of a mode scrambler or other mode-mixing means in conjunction with the source. NOTE - Co
39、nformance to this requirement can normally be met by appropriate qualification at the source connection to the test sample fiberkable, unless a branching device is used between this connection and point A. If a branching device is used, it shall be located in the light path prior to point A, and the
40、 conditions of FOTP-54 shall be met at point A for each test port. 3.1.3 Source stability Unless otherwise permitted by the Detail Specification, the light source output intensity variability shall be less than + 0.02 dB, or one-tenth of the maximum expected attenuation to be measured, whichever is
41、greater. Otherwise, the source output shall be monitored by a detector to allow correction to this level. 3.1.4 Connection of test sample to light source The test sample should remain connected to the light source for the duration of the test unless connection reproducibility is demonstrated to be b
42、etter than one-tenth of the expected or maximum specified insertion loss of the device. 3 Copyright Electronic Industries Alliance Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3.2 Source monitoring equipment 50 pm 62.5 pm If
43、 better stability of the optical source is needed, use apparatus capable of monitoring the source output. If branching devices are used for this purpose for single mode testing, take care to ensure that polarization effects are not significant. If branching devices are used for multimode testing, th
44、e requirements of 3.1.2 may be more difficult to meet. Test equipment that ratiometrically corrects test sample power readings for source power fluctuations, producing a single stabilized reading, reduces the number of required readings and simplifies the calculations. 25 mm 20 mm 3.3 Cladding mode
45、stripper 100 pm Remove light from cladding modes in the test sample. Often the fiber coating is sufficient to perform this function. Otherwise, it will be necessary to use cladding mode strippers near the optical source and detector. If distinct cladding mode strippers are used, apply directly to th
46、e fiber cladding, and avoid microbending at these sites. 25 mm 3.4 High order mode filter For single mode fiber devices, and when higher order modes are capable of propagating to the detector, locate high order mode filters before and after the component under test. Often a single 30 mm diameter loo
47、p will suffice. See FOTP-77. 3.5 Mode filter When using Method A2, unless otherwise specified in the Detail Specification, use mandrel wrap mode filters. Use five close-wound turns with minimal tension on smooth, round mandrels. Create fiber loop diameters as follows: II Fiber core diameter I Mode f
48、ilter diameter II NOTE 1 - The above values represent the fiber loop diameter. If cabled fiber is employed, reduce the mandrel diameter by the cable diameter. For example, 2.5 mm (0.1 inch) cables would require a 17.5 mm diameter (0.65 inch) mandrel to support the fiber loop diameter of 20 mm. NOTE
49、2 - The above values are for standardization purposes and do not necessarily create “steady-state”, “equilibrium”, or “stationary” mode power distri butions. 4 Copyright Electronic Industries Alliance Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NOTE 3 - Mandrel mode filters should not be used on
