1、ANSI/TIA/EIA-455-34A-l995 Approved: October 6, 1995 Reaffirmed: May 16, 2002 The Teleconmiunications Industry Association represents the conmiunications sector of NOTICE TIA/EIA Engineering Standards and Publications are designed to serve the public interest through eliminating misunderstandings bet
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6、ry limitations before its use. (From Standards Proposal No. 3-2936-RF1, formulated under the cognizance of the TIA FO-6.3 Subcommittee on Interconnecting Devices and Passive Components.) This Document was reaffirmed by the American National Standards Institute (ANSI) on May 16,2002 and by the TIA. P
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17、S. 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 equipment 4 3.3 Cladding mode stripper . 4 3.4 High o
18、rder 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 Number of required readings . 7 Calculations or inter
19、pretation 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 Figure 6. Single Mode Method for pigtailed devices 12
20、 Annex A (informative) . 13 Al . IEC 13 A2 . ITU-T . 13 II 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. 2936, and was formulated under the cognizance of TIA FO-6.3, Subcommit
21、tee 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 informative Annex. Key words: insertion loss, multimode, single mode, inte
22、rconnection device . III This page left blank. iv 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. There are two procedures that may be used. In the first, power is measured through a continuous l
23、ength 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 fiberkable is then cut back and the power is remeasured. These procedures do not apply to cable asse
24、mblies. 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 connection (splice, device, connector set, etc.,) comprising normal parts. It deviates from normal us
25、e 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 near perfection of fiber and connector attributes. 1.2 Multimode methods This document contains tw
26、o 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 excitation condition. 1.2.1 Method AI This method employs uniformly overfilled launching condit
27、ions, (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 LANs, which substantially overfill the fiber. 1 1.2.2 Method A2 This method employs a mode filter
28、in the test sample before the component under 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
29、mode method Test Method B is for use with 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 f
30、or overfilled launching condifions for mulfimode 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 mea
31、suremenf - for short- lengfh mulfimode graded-index and single mode opfical fiber cable assemblies 2 3 Apparatus Fiber type Class I and II (multimode) Class III (plastic) Class IVa single mode Class IVb single mode 3.1 Light source Center wavelength Spectral width 850+30 nm 1100 nm 660+30 nm 150 nm
32、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 and A2 shall provide a uniformly overfilled power distribution, as defined by FOTP-54, at point A as shown in Figures 1
33、, 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 - Conformance to this requirement can normally be met by appropriate qualification at the source connection to the test samp
34、le 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 conditions of FOTP-54 shall be met at point A for each test port. 3.1.3 Source stability Unless otherwise permitted by
35、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 greater. Otherwise, the source output shall be monitored by a detector to allow correction to this level. 3.1.4 Connecti
36、on 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 better than one-tenth of the expected or maximum specified insertion loss of the device. 3 3.2 Source monitoring equipmen
37、t 50 pm 62.5 pm If 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 mul
38、timode testing, the 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
39、3.3 Cladding mode 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, ap
40、ply directly to the 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
41、30 mm diameter loop 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
42、 diameter I Mode filter 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 diamet
43、er of 20 mm. NOTE 2 - The above values are for standardization purposes and do not necessarily create “steady-state”, “equilibrium”, or “stationary” mode power distri butions. 4 NOTE 3 - Mandrel mode filters should not be used on cables more than 3.5mm in diameter. For cables larger than 3.5 mm diam
44、eter, apply the appropriate filter to the cable sub-units less than 3.5 mm in diameter. Interconnection devi ce loss 3.6 Detection equipment Res o I ut i on 3.6.1 The detection equipment, such as a lock-in amplifier or optical power meter, shall be capable of measuring all guided-mode optical power
45、emitted from the test sample. The detector shall be linear in optical power response consistent with the accuracy required for the measurement. Stability shall be equivalent to or better than that of the source at the lowest power reading encountered on the meter. 0.5 dB 3.6.2 The optical power mete
46、r display resolution or recorded resolution of an analog measurement device shall be as follows: 50.05 dB 50.5 dB 50.01 dB 4 Sampling and specimens 4.1 Test sample The test sample shall be an interconnection device, such as a splice or mated connector components, and optical fiber or optical fiber c
47、able of the length specified for each method. 4.2 and tools to assemble the optical fiberkable to the interconnection devices. Follow the manufacturers instructions regarding assembly methods, materials 4.3 Test sample length Unless otherwise specified in the Detail Specification, use fiber cable le
48、ngths from 4 to 10 meters (12 to 30 feet) for interconnection devices tested with multimode fiber. Use any length greater than 2 meters (6 ft) for interconnection devices tested with single mode fiber. 5 4.4 Test sample deployment Unless otherwise specified in the Detail Specification, do not allow
49、bends of radius 7.5 cm (G 3 in) in the attached optical fiber cable. 5 Procedures 5.1 Procedure 1 5.1 .I Configure the test equipment and sample fiberkable as shown in Figures 1, 2, or 3 for test methods AI, A2 or B, respectively. Follow all requirements for the test equipment as defined in clause 3 of this document. 5.1.2 Insert the original length of optical fiber or cable between the light source and detector, adding mode filters and/or cladding mode strippers as specified by the test method. Read the initial power, PO. If optical source monitoring is required, also read the init
