Patent ID: 11870497
Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. An optical reception device comprising:
a local light transmission unit configured to generate a plurality of local lights having different wavelengths, select, from among the plurality of generated local lights having different wavelengths, a local light having a wavelength that is closest to the wavelength of a received optical signal, and transmit the selected local light to a coherent receiver;
an optical splitter configured to receive the received optical signal and transmit the received optical signal to the coherent receiver via a first path; and
a wavelength detection unit configured to receive the received optical signal from the optical splitter via a second path, split the received optical signal into different paths according to wavelengths by using a wavelength multiplexer/demultiplexer, and output, to the local light transmission unit, a control signal for causing the local light transmission unit to output a local light having a frequency that corresponds to a path in which the optical signal is included.