Patent ID: 8861979

Claim:
A coherent receiver apparatus, comprising a polarization beam splitter and a chromatic dispersion compensation module, an optical splitter and a chromatic dispersion monitoring module; and wherein: the optical splitter is disposed in front of the polarization beam splitter, and the chromatic dispersion monitoring module is connected between the optical splitter and the chromatic dispersion compensation module; the optical splitter is configured to split a modulated optical signal received by the coherent receiver apparatus and then transmit the split modulated optical signal to the chromatic dispersion monitoring module and the polarization beam splitter; and the chromatic dispersion monitoring module is configured to perform chromatic dispersion monitoring on the modulated optical signal transmitted by the optical splitter to determine a chromatic dispersion range of the modulated optical signal that is received by the coherent receiver apparatus; and the chromatic dispersion compensation module is configured to perform chromatic dispersion compensation according to the chromatic dispersion range monitored by the chromatic dispersion monitoring module; and the modulated optical signal transmitted by the optical splitter to the chromatic dispersion monitoring module is a double-sideband modulated optical signal; and the chromatic dispersion monitoring module further comprises: a first filter, a second filter, a first photodetector, a second photodetector, a first clock recovery circuit, a second clock recovery circuit, and a phase comparator, wherein: the first filter and the second filter are respectively configured to filter the double-sideband modulated optical signal transmitted by the optical splitter to obtain an upper sideband signal and a lower sideband signal of the double-sideband modulated optical signal; the first photodetector and the second photodetector are respectively configured to perform photoelectric conversion on obtained signals output by the first filter and the second filter; the first clock recovery circuit and the second clock recovery circuit are respectively configured to recover clock signals from data obtained through photoelectric conversion that is performed by the first photodetector and the second photodetector; and the phase comparator is configured to obtain a chromatic dispersion monitoring result according to a phase difference between the phase of the clock signal that is output by the first clock recovery circuit and the phase of the clock signal that is output by the second clock recovery circuit.