Polarization diversity detection of optical signals transmitted

Details Polarization diversity detection of optical signals transmitted Polarization diversity detection of optical signals transmitted

1994-12-06

1997-08-19

Boudreau, Leo

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359192, H04B 1000, H04B 1006

Patent

active

056594127

ABSTRACT:
An apparatus and method which utilize polarization diversity detection to compensate for polarization-mode dispersion (PMD) introduced in an optical signal propagating over a medium such as optical fiber. A received optical signal is separated into first and second polarization components by a polarization beam splitter (PBS). A control signal corresponding to a phase difference between the polarization components is used to drive at least one polarization controller located in the optical signal path before the PBS, such that the two polarization components are aligned with the PSPs of the received optical signal. The control signal may also be used to adjust a variable delay element such that phases of the two polarization components are aligned before the components are combined to provide a PMD-compensated output signal. Other aspects of the invention are directed to polarization control using a rotator element with low numerical aperture input and output signal coupling, and to the use of feedback control to compensate for variations in loss through a polarization controller.

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