IEC TR 62627-03-01:2011

Fibre optic interconnecting devices and passive components - Part 03-01: Reliability - Design of an acceptance test for fibre pistoning failure of connectors during temperature and humidity cycling: demarcation analysis

IEC/TR 62627-03-01:2011(E) gives an example of the design of an acceptance test for ferrule style connectors when the dominant failure mode is fibre pistoning. The example applies to connectors which use epoxies or other adhesive polymers to bond the fibre into a ferrule. It combines existing evidence, mechanistic hypotheses and the demarcation approximation to develop an accelerated environmental exposure sequence that can be used on a pass-only basis to help ensure reliable service. This technical report was developed to serve only as an example of how accelerated acceptance tests can be designed. It is not intended as a normative standard for any specific application.

General Information

• Status: Published
• Publication Date: 06-Apr-2011
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 33.180.01 - Fibre optic systems in general
• Technical Committee: SC 86B - Fibre optic interconnecting devices and passive components
• Current Stage: PPUB - Publication issued
• Start Date: 15-Jun-2011
• Completion Date: 07-Apr-2011

Standards Content (Sample)

IEC/TR 62627-03-01 ®
Edition 1.0 2011-04
TECHNICAL
REPORT
colour
inside
Fibre optic interconnecting devices and passive components –
Part 03-01: Reliability – Design of an acceptance test for fibre pistoning failure
of connectors during temperature and humidity cycling: demarcation analysis

IEC/TR 62627-03-01:2011(E)
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IEC/TR 62627-03-01 ®
Edition 1.0 2011-04
TECHNICAL
REPORT
colour
inside
Fibre optic interconnecting devices and passive components –
Part 03-01: Reliability – Design of an acceptance test for fibre pistoning failure
of connectors during temperature and humidity cycling: demarcation analysis

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
R
ICS 33.180.01 ISBN 978-2-88912-449-7

– 2 – TR 62627-03-01  IEC:2011(E)
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Optical fibre connectors and the pistoning failure mode . 6
3 Demarcation map theory for thermally activated processes . 6
3.1 Concept of demarcation energy . 6
3.2 Demarcation maps . 8
4 Plausible physical effects in a model of the degradation process associated with
fibre pistoning . 9
4.1 General . 9
4.2 Simple temperature humidity models . 10
4.3 Temperature humidity models with diffusion . 11
4.4 A model of delamination . 11
4.5 A model of stress relaxation . 13
4.6 Two models bounding cyclic hysteresis . 14
5 Summary of results and discussion. 16
Bibliography . 18

Figure 1 – Reaction extent as a function of activation energy compared to the ∆k t
function. 7
Figure 2 – Demarcation maps for service life and accelerated test of example in 4.2 . 8
Figure 3 – Schematic for the delamination process . 12

Table 1 – Accelerated test index of coverage for simple temperature-humidity model . 10
Table 2 – Index of coverage, numerical experiments . 16

TR 62627-03-01  IEC:2011(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIBRE OPTIC INTERCONNECTING
DEVICES AND PASSIVE COMPONENTS –

Part 03-01: Reliability – Design of an acceptance test for fibre pistoning
failure of connectors during temperature and humidity cycling:
demarcation analysis
FOREWORD
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The main task of IEC technical committees is to prepare International Standards. However, a
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data of a different kind from that which is normally published as an International Standard, for
example "state of the art".
IEC 62627-03-01, which is a technical report, has been prepared by subcommittee 86B: Fibre
optic interconnecting devices and passive components, of IEC technical committee 86: Fibre
optics.
– 4 – TR 62627-03-01  IEC:2011(E)
The text of this technical report is based on the following documents:
Enquiry draft Report on voting
86B/2996/DTR 86B/3038/RVC
Full information on the voting for the approval of this technical report can be found in the
report on voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts of the IEC 62627 series, published under the general title Fibre optic
interconnecting devices and passive components, can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
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TR 62627-03-01  IEC:2011(E) – 5 –
INTRODUCTION
Fibre optic connectors rely on accurate positioning of the fibre with respect to an optical
interface to achieve and maintain acceptable performance. Degradation of performance due
to fibre motion (fibre pistoning) is a well known failure mode. It is activated by temperature
and humidity exposure, especially cyclic. Clause 3 provides background on the pistoning
failure mode.
An acceptance test is an accelerated test designed to detect degradation or failure modes if
they would occur during life, and to show no change if no degradation or failure modes will
occur. A perfect acceptance test is impossible [1] because (a) there can always be non-
accelerable failure modes and (b) some failures may occur under acceleration that may not
occur in service. However, a well-designed acceptance test provides for a supplier a
reasonable check of the space of accelerable modes and is of great value in testing for
reliability.
Demarcation mapping provides a method of viewing possible chemical and physical
processes that can occur during a given stress exposure over a given time [1-4] and allows
for selection of accelerating test conditions that will produce potential degradation or failure
mechanisms during service. Clause 2 provides an overview of the demarcation approach and
its application to developing acceptance tests.
Clause 3 provides a discussion of plausible physical processes accompanying degradation
and fibre pistoning, based on an assumed service environment. It includes some models
based on these processes, and mathematical tools necessary to develop the demarcation
maps. Clause 4 summarizes the results of a numerical experiment, using demarcation maps
for each of the processes developed in Clause 3, to compare 20-year life in an extreme
tropical climate with accelerated tests.

—————————
Figures in square brackets refer to the Bibliography.

– 6 – TR 62627-03-01  IEC:2011(E)
FIBRE OPTIC INTERCONNECTING
DEVICES AND PASSIVE COMPONENTS –

Part 03-01: Reliability – Design of an acceptance test for fibre pistoning
failure of connectors during temperature and humidity cycling:
demarcation analysis
1 Scope
This part of IEC 62627 gives an example of the design of an acceptance test for ferrule style
connectors when the dominant failure mode is fibre pistoning. The example applies to
connectors which use epoxies or other adhesive polymers to bond the fibre into a ferrule.
It combines existing evidence, mechanistic hypotheses and the demarcation approximation to
develop an accelerated environmental exposure sequence that can be used on a pass-only
basis to help ensure reliable service. This technical report was developed to serve only as an
example of how accelerated acceptance tests can be designed. It is not intended as a
normative standard for any specific application.
2 Optical fibre connectors and the pistoning failure mode
The most commonly used fibre optic connector designs are based on butt-joint fibre alignment.
The fibre is generally adhesively-bonded
...