TIA-455-228:2002 (R2012)

$33.15

FOTP-228 Relative Group Delay and Chromatic Dispersion Measurement of Single-Mode Components and Devices by the Phase Shift Method

Published By	Publication Date	Number of Pages
TIA	2002	52

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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
shift of the modulated signal exiting the fiber at that wavelength
is recorded with respect to the original modulation signal. The
phase shift can be converted directly to RGD in the device. By
collecting RGD data at various wavelengths, the chromatic
dispersion of the component can be determined at these and other
wavelengths from the derivative with respect to wavelength of the
relative group delay.

This FOTP does not apply to components that have in excess of 10
dB of polarization dependent loss (PDL). The main intent of this
FOTP is to determine the average group delay and chromatic
dispersion of the component and moreover to isolate the RGD from
all polarization sensitivity in the device.

Note that in the case of fiber pigtailed components, the
pigtails may give a large absolute (standing) delay but also some
relative delay, over the component test wavelength range. In most
cases of component measurements, only the relative group delay is
of interest, so it is important to account for any RGD in the
leads, and to ensure the standing delay is stable over the
measurement time. Any changes in the standing delay and any RGD in
the leads will be evident in the test results.

Additional information