1、 TIA TELECOMMUNICATIONS SYSTEMS BULLETIN Procedure for Applying Loads Directly tothe Fiber in Optical Connectors or Fiber/Ferrule Assemblies to Quantify Fiber Pushback TSB-62-10 January 2008TELECOMMUNICATIONS INDUSTRY ASSOCIATION The Telecommunications Industry Association represents the communicati
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6、tablish appropriate safety and health practices and to determine the applicability of regulatory limitations before its use. (From Standards Proposal No. 3-4316-RV1, formulated under the cognizance of the TIA FO-4 Committee on Fiber Optics, FO-4.3 Passive Optical Devices and Components). Published b
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23、to the fiber in opticalconnectors or fiber/ferrule assemblies to quantify fiber pushbackContentsForeword.iii1 Introduction. 12 Normative references 23 Apparatus 34 Sampling and specimens 55 Procedure. 66 Calculations or interpretation of results 77 Documentation. 8Annex A Informative references. 9Fi
24、gure 1 - Truncated cone zirconia blank loading a connector endface. 4Figure 2 - Connector mounting fixture for load application 5TIA/EIA/TSB-62-10iiThis page left blank.TIA/EIA/TSB-62-10iiiITM-10Procedure for applying loads directly to the fiber in opticalconnectors or fiber/ferrule assemblies to qu
25、antify fiber pushbackForeword(This Foreword is informative only and is not part of this Standard.)This document comes from TIA Standards Proposal No. 4316-RV1, formulated under thecognizance of FO-6, Committee on Fiber Optics and FO-6.3, Subcommittee on FiberOptic Interconnecting Devices.This Specif
26、ication forms a part of the series of informative test methods included withinRecommended Standard EIA/TIA-455.There is one annex, which is informative.Key words: connector reliability, adhesive, adhesive reliability, epoxy, connector endfacegeometry.TIA/EIA/TSB-62-10ivThis page left blank.TIA/EIA/T
27、SB-62-101ITM-10Procedure for applying loads directly to the fiber in opticalconnectors or fiber/ferrule assemblies to quantify fiber pushback1 Introduction1.1 IntentThe intent of this test is to determine the ability of an adhesive to adequately lock theoptical fiber into a stable, fixed position in
28、 an optical connector when the connector ismated under load. The test is designed for comparative performance testing of differentadhesive formulations and/or connector assembly procedures.1.2 ScopeThis test measures fiber pushback, defined as permanent or semipermanent fiber motionunder load. It do
29、es not include temporary fiber movement relative to the ferrule due totemperature 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 bymeans of an adhesive.To perform this test pro
30、cedure, the user must have the capability of measuring the fiberposition relative to the ferrule to within the accuracy required by the Detail Specification.Contacting or non-contacting interferometry are the typical types of measurementequipment used.Because this test is for comparative purposes on
31、ly, and not intended to simulate the actualamount 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.1.3 BackgroundThis test was developed because excessive, permanent fiber pushback can res
32、ult in lossof physical contact at the connector endfaces, particularly if connectors are disconnectedand remated in a different configuration. In certain applications, the resulting increased lossand reflectance due to a gap at the fiber-fiber interface can cause unacceptable systemperformance degra
33、dation.TIA/EIA/TSB-62-102Typical 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 (dirt/grease contamination, adhesiveshelf life out of date, pot life exceeded, etc.
34、),- incomplete or improper adhesive cure,- incomplete epoxy fill between the fiber and ferrule.1.4 HazardsThis method may involve the use of adhesives in the sample preparation, which may behazardous, and users of this ITM should consult the Materials Safety Data Sheets for thematerials they are usi
35、ng and follow appropriate safety procedures. This test method doesnot purport to address all of the safety problems associated with its use. It is theresponsibility of the user of the method to establish appropriate safety and health practicesand determine the applicability of regulatory limitations
36、 prior to use.1.5 SummaryThe 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 occursunder exposure to environmental conditions and for a length of time which are determinedby the u
37、ser of the test method. After aging, the load is removed from the fiber and the fiberposition relative to the ferrule is remeasured.2 Normative referencesTest or inspection requirements may include, but are not limited to, the followingreferences:EIA/TIA-455-B, Standard test procedures for fiber opt
38、ic fibers, cables, transducers,sensors, connecting and terminating devices, and other fiber optic components.TIA/EIA/TSB-62-1033 Apparatus3.1 Measurement of fiber position relative to ferrule endfaceThe measurement of the fiber position relative to the ferrule endface shall be completedbefore and af
39、ter the fiber pushback test. The measurements shall be made undercontrolled ambient conditions to ensure that the measured change is due to pushback andnot temperature or humidity effects.3.2 Fiber loading piece partsThe load to the connector piece parts shall be applied by means of solid zirconia b
40、lanks ofnominally the same ferrule O.D. as the ceramic ferrule connector (2.499 mm). Ceramicalignment tubes shall be used to align the solid zirconia blanks to the fiber/ferrule of theoptical connector. The alignment tube I.D. shall be large enough so that friction of theloading zirconia blank insid
41、e the tube is negligible, but small enough so that the zirconiablank is well-centered (to within 5 m) on the test specimen. Typical values would be aferrule O.D. of 2.499 mm, and a tube I.D. of 2.502 mm (+4 m,-0 m).Figure 1 shows the truncated cone design for the zirconia blank. The tip of the cone
42、ispolished flat, with a diameter of approximately 85-105 m, so that when brought intocontact with the connector test specimen, it contacts only the glass fiber. The tip of the coneshould be concentric to within 5 m. The angle of the cone shall be such that it will notbottom out on the ferrule during
43、 the pushback test. An angle of 60 is typically sufficient.TIA/EIA/TSB-62-104Figure 1. Truncated cone zirconia blank loading a connector endface.85 - 105 mTRUNCATED CONEZIRCONIA BLANKCONNECTORFERRULEOPTICAL FIBERADHESIVEALIGNMENT TUBELOAD60 TIA/EIA/TSB-62-1053.3 Loading fixtureThe fixture to apply t
44、he load may be of any design which will enable a known, controlledload to be applied to the zirconia blank. One such design is shown in Fig. 2.Figure 2. Connector mounting fixture for load application.4 Sampling and specimensA test sample shall consist of optical connectors or connector subassemblie
45、s. The criticalpart of the connector required for the test is the fiber/ferrule subassembly. The initial fiberposition relative to the ferrule should be specified in the Detail Specification.BASEPLATEHINGEWEIGHTFIBER PIGTAILCONNECTORMOUNTING PLATEPROTECTIVE CAPLEVER ARMSUPPORT POSTALIGNMENTTUBEZIRCO
46、NIABLANKTIA/EIA/TSB-62-106If this test is used for product acceptance, the ferrule samples shall be selected randomlyso that the results are representative of the product population. If the test is used todetermine the effect of a particular ferrule parameter (for example, endface radius), thatparam
47、eter shall be measured and controlled at several nominal values within stated limits(or recorded and analyzed as a co-variate) while all others are allowed to vary randomlywithin production limits.5 Procedures5.1 PreconditioningUnless otherwise specified in the Detail Specification, precondition the
48、 test specimens fora minimum period of 24 hours under the controlled ambient atmospheric condition ofEIA/TIA-455-B.5.2 Measurement of fiber position relative to the ferruleMeasure the fiber position relative to the ferrule before undergoing the test.5.3 Fiber pushback testThe fiber pushback test inc
49、ludes the following steps:5.3.1 Specimen mountingMount the connector or connector subassembly in the mounting fixture, with the ferruleinserted in the alignment tube. Mate the truncated cone against the connector testspecimen and apply the load. Typical loads applied range from 0.05 kg to 0.25 kg.5.3.2 Test exposureExpose the connector or connector subassembly, mounted in the fixture, to a pre-determined environmental test condition and and length of time. The test temperature isusually the maximum operating temperature expected for the ferr
