TIA/EIA-455-197:2000 (R2008)

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FOTP-197 Differential Group Delay Measurement of Single-Mode Components and Devices by the Differential Phase Shift Method

Published By	Publication Date	Number of Pages
TIA	2000	36

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Description

In this procedure, a modulated light source at a given
wavelength is coupled into the component under test, and the phase
of the modulated signal exiting the fiber at a first polarization
state is compared with the phase at a second, orthogonal
polarization state. Once the maximum phase difference has been
determined, corresponding to the input states of polarization
(SOP's) aligning to the two principal axes of the component, this
is converted to a delay difference, and reported as the DGD for the
component at that wavelength.

For the purposes of this document, the component is considered
to be measured at a single wavelength, and therefore the result
reported is stictly the DGD.

This FOTP does not apply to components that have in excess of 10
dB of polarization dependent loss (PDL).

Additional information