Single sweep polarization dependent loss measurement
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United States of America Patent
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Feb 15, 2005
Grant Date -
Sep 23, 2004
app pub date -
Mar 21, 2003
filing date -
Mar 21, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A polarization scan module is presented. The polarization scan module according to some embodiments of the present invention includes a swept-wavelength optical source providing a light signal that sweeps over a range of optical wavelengths, the light signal having a state of polarization; and a polarization rotator that rotates the state of polarization over a Poincare sphere as the light signal wavelength is swept within the range to produce a test optical signal. A single sweep polarization dependent loss measurement can be achieved with some embodiments of the present invention. In some embodiments, measurements of the state of polarization and optical power at the input and output of an optical component being tested together with the known optical wavelength for the state of polarization, taken at four different polarizations, can provide a set of measurement data that can be used to compute the polarization dependent loss.
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