Patent ID: 8824902
Filing Date: 2014-09-02
Classification: H04B

Abstract:
1. An optical receiver comprising: an optical to electric converter that converts a received optical signal into an analog electric signal; an analog to digital converter that converts the analog electric signal obtained by the optical to electric converter into a digital signal; a digital signal processor that performs wave shaping on the digital signal to produce a shaped signal; an information extract circuit that extracts information related to loss or deterioration of the optical signal from a signal propagating from the analog to digital converter to the digital signal processor or a signal in the digital signal processor; and a judging circuit that judges, based on the information extracted by the information extract circuit, whether the optical signal is lost or deteriorated by comparing the information with a threshold, the information including at least one of: wherein the threshold has a first value for judging deterioration of the optical signal and a second value for judging loss of the optical signal, the second value being different from the first value.