TIA/EIA-455-157:1994 (R2008)

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FOTP-157 Measurement of Polarization Dependent Loss (PDL) of Single-Mode Fiber Optic Components

Published By	Publication Date	Number of Pages
TIA	1994	24

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Description

This procedure can be applied to any single-mode passive
component, including connectors, splices, couplers, attenuators,
isolators and switches. It is used to measure the total range of
insertion loss, a, due to changes in polarization of the launch
state. This procedure can also be used to measure the polarization
dependence of isolated ports. For branching devices, it can also be
used to measure the total range of coupling ratio, cr (i). It
cannot be used to measure polarization maintaining components or to
measure the polarization dependence of return loss.

Two methods for measuring the polarization dependence are
described. Method A will determine the maximum polarization
sensitivity over all possible polarization states including linear,
circular and elliptical. Method B will determine the maximum
polarization sensitivity over all linearly polarized launch states.
Method A is preferred, particularly for any device in which the
polarization state of light passing through the device is
recommended to ensure that it is adequate for a particular
component. Method B will generally understate the polarization
sensitivity of devices which are not dependent on linearly
polarized light. Therefore, it is not recommended for tests where
the device under test (DUT) has not been characterized to be
sensitive to purely linear polarized light.