An automatic polarization controller is described that includes an optical input that receives a polarization multiplexed optical pulse train that comprises a first and a second polarized optical pulse train. A dither modulation signal is superimposed on at least one of the first and the second polarized...http://www.google.com/patents/US20040016874?utm_source=gb-gplus-sharePatent US20040016874 - AUTOMATIC POLARIZATION CONTROLLER FOR POLARIZATION MULTIPLEXED OPTICAL SIGNALS
