Importance

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Abstract

An optical polarization modulator (OPM) for use in an optical communication system includes two polarizing beam splitters (PBSs) and an adjusting stage coupled between the PBSs. One PBS receives an input optical signal with an arbitrary state of polarization (SOP) and splits it into its TE and TM components. The adjusting stage can change the amplitude and/or relative phase between the TE and TM components to help achieve a desired state of polarization (SOP). The ACS and PCS may include MZIs to both adjust the amplitude and the relative phase difference between the TE and TM components. Alternatively, the OPM may include an amplifier and a phase shifter for each component. The second PBS combines the adjusted components to form the output signal with a desired SOP. Another embodiment of the OPM includes an Y-junction coupler, two plasma optical-effect silicon phase shifter stages, a 2.times.2 3-dB coupler and a PBS. The Y-junction coupler splits the incoming optical signal into two equal portions (containing TM and TE components). The first stage adjusts the relative phase between the portions. The 2.times.2 3-dB coupler allows the phase adjusted portions to interact to adjust the amplitude. The second stage adjusts the phase difference between the two portions for TE and TM components and outputs the adjusted portions to the PBS via polarization maintaining fibers. The PBS then combines the TE component of one portion with the TM component of the other portion to form an output signal with the desired SOP.

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First Claim