1、 _ - - STD-EIA TSBb2-LO-ENGL 1999 3234600 0637695 Lb2 TINEIA TELECOMMUNICATIONS SYSTEMS BULLETIN Procedure for Applying Loads Directly To the Fiber in Optical Connectors or Fiber/Ferrule Assemblies to Quantify Fiber Pushback TSB62-10 DECEMBER 1999 TELECOMMUNICATIONS INDUSTRY ASSOCIATION Electronic I
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6、nformaion usefiil to the technid community, and represent approaches to good engineering practices that are suggested by the formulating committee. This Bulletin is not intended to preclude or discourage other approaches that similarly represent good engineering practice, or that may be acceptable t
7、o, or have been accepted by, appropriate bodies. Parties who wish to bring other approaches to the attention of the formulaing committee to be considered for inclusion in future revisions of this Bulletin are enmuraged to do so. It is the intention of the formulaing committee to revise and update th
8、is Bulletin fbm time to time as may be occasioned by changes in technology, industry practice, or government regulations, or for other appropriate reasons. (From Project No. 43 16, formulated under the cognizance of the TIA FO-6.3 Subcommittee on Fiber Optic Interconnecting Devices.) Published by TE
9、LECOMMUNICATIONS INDUSTRY ASSOCIATION 1999 Standards and Technology Department 2500 Wilson Boulevard Ariington, VA 22201 PRICE: Please refer to the current Catalog of ELECTRONIC INDUSTRIES ALLIANCE STANDARDS and ENGINEERING PUBLICATIONS or call Global Engineering Documents, USA and Canada (1-800-854
10、-7179) international (303-397-7956) All rights reserved printed in U.S.A. - STD-EIA TSBbZ-LU-ENGL 1999 m 323Yb00 0637697 T35 m TIA/EIA/TSB-62-1 O ITM-I O Procedure for applying loads directly to the fiber in optical connectors or fiber/ferruIe assemblies to quantify fiber pushback Contents . Forewor
11、d . III 1 Introduction . 1 2 Normative references 2 3 Apparatus 3 4 5 Procedure . 6 6 Calculations or interpretation of results 7 7 Documentation . 8 Annex A- Informative references 9 Figure 1 - Truncated cone zirconia blank loading a connector endface . 4 Figure 2 - Connector mounting fixture for l
12、oad application 5 Sampling and specimens 5 I STD-EIA TSBb2-LO-ENGL 1999 H 3234bOO Ob37698 97L H TINEICVTSB-62-1 O ITM-i O Procedure for applying loads directly to the fiber in optical connectors or fiber/ferrule assemblies to quantify fiber pushback Foreword (This Foreword is informative only and is
13、 not part of this Standard.) This document comes from TIA Standards Proposal No. 4316, formulated under the cognizance of FO-6, Committee on Fiber Optics and FO-6.3, Subcommittee on Fiber Optic Interconnecting Devices. This Specification forms a part of the series of informative test methods include
14、d within Recommended Standard ElWlA-455. There is one annex, which is informative. Key words: connector reliability, adhesive, adhesive reliability, epoxy, connector endface geometry. Previous page is blank STD-EIA TSBbZ-LO-ENGL 1999 32311600 0b37b99 808 - TIA/EIA/TSB-62-1 O Procedure for applying l
15、oads directly to the fiber in optical connectors or fiberferrule assemblies to quantify fiber pushback I Introduction 1.1 Intent The intent of this test is to determine the ability of an adhesive to adequately lock the optical fiber into a stable, fixed position in an optical connector when the conn
16、ector is mated under load. The test is designed for comparative performance testing of different ad hesive formulations and/or connector assembly procedures. 1.2 Scope This test measures fiber pushback, defined as permanent or semipermanent fiber motion under load. It does not include temporary fibe
17、r movement relative to the ferrule due to temperature variations, or permanent fiber withdrawal that occurs when no load is present. The test applies to any type of optical connector in which a fiber is affixed into a ferrule by means of an adhesive. To perform this test procedure, the user must hav
18、e the capability of measuring the fiber position relative to the ferrule to within the accuracy required by the Detail Specification. Contacting or non-contacting interferometry are the typical types of measurement equipment used. Because this test is for comparative purposes only, and not intended
19、to simulate the actual amount of fiber pushback in optical connectors, it is not a specifiable parameter. Therefore, this test method shall not be called out in any TIA specification document. I .3 Background This test was developed because excessive, permanent fiber pushback can result in loss of p
20、hysical contact at the connector endfaces, particularly if connectors are disconnected and remated in a different configuration. In certain applications, the resulting increased loss and reflectance due to a gap at the fiber-fiber interface can cause unacceptable system performance degradation. I TI
21、A/EIA/TSB-62-1 O Typical causes of fiber pushback may include, but are not limited to, the following: - inappropriate choice of adhesive for the application/environment, - improper connector assembly procedures (diwgrease contamination, adhesive shelf life out of date, pot life exceeded, etc.), - in
22、complete or improper adhesive cure, - incomplete epoxy fill between the fiber and ferrule. 1.4 Hazards This method may involve the use of adhesives in the sample preparation, which may be hazardous, and users of this ITM should consult the Materials Safety Data Sheets for the materials they are usin
23、g and follow appropriate safety procedures. This test method does not purport to address all of the safety problems associated with its use. It is the responsibility of the user of the method to establish appropriate safety and health practices and determine the applicability of regulatory limitatio
24、ns prior to use. 1.5 Summary The test method consists of a measurement of the fiber position relative to the ferrule, followed by aging while the optical fiber is placed under a constant load. The aging occurs under exposure to environmental conditions and for a length of time which are determined b
25、y the user of the test method. After aging, the load is removed from the fiber and the fiber position relative to the ferrule is remeasured. 2 Normative references Test or inspection requirements may include, but are not limited to, the following references: EIAKIA-455-B, Sfandard fest procedures fo
26、r fiber optic fibers, cables, transducers, sensors, connecting and ferminafing devices, and ofher fiber optic components. 2 STDmEIA TSBb2-30-ENGL 3777 W 3234b00 Ob37703 29b = TINEIAITSB-62-1 O 3 Apparatus 3.1 Measurement of fiber position relative to ferrule endface The measurement of the fiber posi
27、tion relative to the ferrule endface shall be completed before and after the fiber pushback test. The measurements shall be made under controlled ambient conditions to ensure that the measured change is due to pushback and not temperature or humidity effects. 3.2 Fiber loading piece parts The load t
28、o the connector piece parts shall be applied by means of solid zirconia blanks of nominally the same ferrule O.D. as the ceramic ferrule connector (2.499 mm). Ceramic alignment tubes shall be used to align the solid zirconia blanks to the fiber/ferrule of the optical connector. The alignment tube I.
29、D. shall be large enough so that friction of the loading zirconia blank inside the tube is negligible, but small enough so that the zirconia blank is well-centered (to within 5 pm) on the test specimen. Typical values would be a fernile O.D. of 2.499 mm, and a tube I.D. of 2.502 mm (+4 pm, -0 pm). F
30、igure 1 shows the truncated cone design for the zirconia blank. The tip of the cone is polished flat, with a diameter of approximately 85-105 pm, so that when brought into contact with the connector test specimen, it contacts only the glass fiber. The tip of the cone should be concentric to within f
31、 5 pm. The angle of the cone shall be such that it will not bottom out on the ferrule during the pushback test. An angle of 60“ is typically sufficient. 3 STD-EIA TSBb2-LO-ENGL 1997 3234600 Ob37702 222 TIA/ElA/TSB-62-1 O LOAD II TRUNCATED CONE ZIRCONIA BLANK Figure 1. Truncated cone zirconia blank l
32、oading a connector endface. 4 TINEIMSB-62-1 O 3.3 Loading fixture The fixture to apply the load may be of any design which will enable a known, controlled load to be applied to the zirconia blank. One such design is shown in Fig. 2. PROTECTIVE CAP - HINGE LEVERARM 7 1 WEIGHT V / ALIGNMENT ZIRCONIA T
33、I IRF BLANK 1 BASEPLATE t v - SUPPORT POST CONNECTOR MOUNTING PLATE FIBER PIGTAIL k Figure 2. Connector mounting fixture for load application. 4 Sampling and specimens A test sample shall consist of optical connectors or connector subassemblies. The critical part of the connector required for the te
34、st is the fiberlferrule subassembly. The initial fiber position relative to the ferrule should be specified in the Detail Specification. 5 STD.EIA TSBb2-10-ENGL 1999 3234bD0 Ob37704 TT5 TINEIWSB-62-1 O If this test is used for product acceptance, the ferrule samples shall be selected randomly so tha
35、t the results are representative of the product population. If the test is used to determine the effect of a particular ferrule parameter (for example, endface radius), that parameter shall be measured and controlled at several nominal values within stated limits (or recorded and analyzed as a Co-va
36、riate) while all others are allowed to vary randomly within production limits. 5 Procedures 5.1 Preconditioning Unless otherwise specified in the Detail Specification, precondition the test specimens for a minimum period of 24 hours under the controlled ambient atmospheric condition of EVVTIA455-B.
37、5.2 Measurement of fiber position relative to the ferrule Measure the fiber position relative to the ferrule before undergoing the test. 5.3 Fiber pushback test The fiber pushback test includes the following steps: 5.3.1 Specimen mounting Mount the connector or connector subassembly in the mounting
38、fixture, with the ferrule inserted in the alignment tube. Mate the truncated cone against the connector test specimen and apply the load. Typical loads applied range from 0.05 kg to 0.25 kg. 5.3.2 Test exposure Expose the connector or connector subassembly, mounted in the fixture, to a pre- determin
39、ed environmental test condition and and length of time. The test temperature is usually the maximum operating temperature expected for the ferrule assembly (typically 65C for outside plant conditions). Most of the fiber pushback will occur over the first few hours; the typical exposure time is 24 ho
40、urs. 5.3.3 Specimen removal 6 _ STD-EIA TSBb2-LO-ENGL 1999 3234b00 Ob37705 931 = TIA/EIA/TSB-62-1 O Remove the test fixture from the environmental test condition and allow it to equilibrate to room temperature before removing the load. The measurement shall be made within one- half hour after remova
41、l of the applied load. 5.4 Measurement of fiber position relative to the ferrule Remeasure the fiber position relative to the ferrule after undergoing the test. 6 Calculations or interpretation of results This test is used to compare the performance of different adhesives, assembly procedures, or re
42、sistance to different environmental conditions, etc., by comparing the amount of fiber pushback for different circumstances. Sufficient samples should be tested to take into account the variability in specimen performance. Typically, this will consist of 8-1 O samples. The precision and bias for the
43、 measurements are determined by the test method used to measure the sample endface geometry, in particular the fiber height. A test procedure to make this measurement is under development, but is not yet published. 7 Documentation 7.1 The test data sheets shall contain the following: 7.1.1 Date of t
44、est. 7.1.2 Title of test (ITM number). 7.1.3 Sample description NOTE - This shall include sample preparation information (type of adhesive, curing and assembly conditions, etc.). It shall also include the fiber position relative to the ferrule. 7 STD*EIA TSBb2-LO-ENGL 1999 3234b00 Ob37706 878 D TINE
45、IMSB-62-1 O 7.1.4 Test parameters NOTE - These shall include: - the value of the contact area and outside diameter of the zirconia blank, -the inner diameter of the alignment sleeve, - the number of samples on test, - the type of loading fixture, - the value of the applied load, - the test environme
46、nt, - the length of time that the connectors were exposed to the test, and - the test equipment used to measure the endface geometry. 7.1.5 Test results - the initial and final values of the fiber position before and after the test. 7.2 United States military applications require that the following
47、information also be reported for each test. For other (nonmilitary) applications, this information need not be reported but shall be available for review upon request. 7.2.1 Test personnel. 7.2.2 Test equipment used to measure fiber position relative to the ferrule and date of latest calibration. 8
48、- - - STD-EIA TSBb2-LO-ENGL 1777 3234600 Ob37707 704 TINEIAITSB-62-1 O Annex A (informative) Informative references: FOTP-194 (El/WlA-455-194A), Measurement of fiber pushback in optical connectors. IEC-1300-3-23, 1st Edition, 1995, Fibre optic interconnecting devices and passive components - fiber position relafive to ferrule enface. DI 780-94 Standard Practice for conducting creep tests of metal-to-metal adhesives (ASTM standard) 9
