Patent ID: 8903255
Filing Date: 2014-12-02
Classification: H04B,H04J

Abstract:
1. A polarization-multiplexed signal receiver, comprising: a polarization adjustment unit to adjust a polarization state of inputted polarization-multiplexed signal, which is carrying signal data on each of two polarized waves being inputted, based on a control signal and to output said adjusted polarization-multiplexed signal; an optical signal reception unit to convert said polarization-multiplexed signal having said adjusted polarization state into an analog electric signal and output said analog electric signal; an A/D conversion unit to convert said analog electric signal into a digital electric signal and output said digital electric signal; a digital signal processing unit to perform digital coherent processing to said digital electric signal and take out said signal data; and a feedback control unit to generate said control signal based on quality of said signal data taken out by said digital signal processing unit and output said signal data taken out by said digital signal processing unit to said polarization adjustment unit, wherein said digital signal processing unit performs polarization separation of said digital electric signal by applying CMA (Constant Modulus Algorithm) and takes out said signal data, and the polarization adjustment unit is feedback-controlled based on a quality of the signal data taken out by said digital signal processing unit with which CMA was applied.