Method and apparatus for polarization stabilization in optical receivers with complex modulation formats

摘要

High optical communication rates are making their way into networks initially designed for 10 Gigabits per seconds (Gbps). These higher rates of 40 Gbps and higher have shorter signaling periods and are more susceptible to differential group delay (DGD). A method and corresponding apparatus in an example embodiment of the present invention compensates for polarization state sensitivity of a receiver by determining a performance metric relating to an error rate due to transmission and reception of a modulated optical signal in a medium introducing DGD. Based on the performance metric, a control vector is determined to control a polarization state of the modulated optical signal. The control vector is applied to a polarization effecting device to compensate for the DGD and the polarization state sensitivity of the receiver. Communication rates of 40 Gbps and higher can be used in transmission mediums that introduce DGD through use of embodiments presented.