Patent ID: 8538265
Filing Date: 2013-09-17
Classification: H04B

Abstract:
1. An optical communication device comprising: a variable dispersion compensator that compensates an amount of wavelength dispersion of an optical signal received from an optical transmission line; a photoelectric converter that converts the compensated optical signal into an electrical signal; and a processor that is operative to extract a frequency of the converted electrical signal, to discriminate “0” bit information and “1” bit information of the electrical signal based on the frequency extracted using a decision phase and a decision threshold, to detect bit error information that is information related to a bit error and the number of the bit error of each piece of the discriminated “0” bit information and “1” bit information, and to control the compensation amount of wavelength dispersion of the optical signal in accordance with a determination result of which positive dispersion or negative dispersion a state of residual dispersion of the optical signal is, based on a comparison result of the detected number of the bit error of the “0” bit information with the detected number of the bit error of the “1” bit information, wherein the processor is operative to detect bit error information that is information related to the bit error and the number of the bit error of each piece of the discriminated “0” bit information and “1” bit information based on the decision phase in a changed state caused by changing the decision phase in an advance direction or a delay direction.