TIA-455-72:1997 (R2013)

$23.40

FOTP-72 Procedure for Assessing Temperature and Humidity Cycling Exposure Effects on Optical Characteristics of Optical Fibers

Published By	Publication Date	Number of Pages
TIA	1997	22

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Description

Introduction

This test procedure describes a method for the determination, in
an accelerated manner, of the effects of temperature and humidity
cycling on the optical characteristics of optical fibers. It is
intended to assess the ability of an optical fiber to withstand
cyclic changes in temperature and humidity in the surrounding
atmosphere. The performance of the fiber during and after cycling
may be evaluated by performing specific optical tests.

The specification of this procedure in conjunction with defined
failure criteria presupposes that the failure criteria selected to
evaluate the property or properties being measured as a function of
the cycling conditions and duration can be shown to relate to the
intended use of the optical fiber. At the time this document was
prepared, no proven model existed for the prediction of the
lifetime performance of fiber deployed in field applications using
data generated through cyclic temperature and humidity testing.

Optical fibers exposed to temperature and humidity cycling may
be subject to many types of changes. The severity of the exposures
in time, temperature, and humidity determines the type and extent
of change. An optical property may not necessarily be degraded by
such cyclic exposure, but may remain unchanged or even improve. A
typical indication of damage resulting from such cycling is an
excessive temporary or permanent change in an optical property,
such as transmittance. The degree of change observed will depend on
the specific property measured. Different properties may not change
at the same rate, and the rate and direction of change may not be
constant over time, temperature, and humidity.

The effects of exposure may be quite variable, especially when
specimens are exposed for long time intervals. Reproducibility is
affected by the temperature and humidity control tolerances, the
duration of the exposure, and the aging characteristics of the
fiber coating(s), among other factors. Errors in exposure
conditions may have cumulative effects over time.

This test is destructive; the fiber specimens are not expected
to remain usable after completion of the test.

Warning: Care should be taken when handling
small-diameter fiber to prevent it from puncturing the skin,
especially in the eye area. Direct viewing of the end of an optical
fiber or of an unterminated optical fiber component port is not
recommended when it is propagating energy unless prior assurance
has been obtained that the energy output level is safe.

Additional information