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US 2012/0237211 A1Published application
Optical receiving apparatus
AssigneeFujitsu Limited
InventorsHiroshi IIZUKA, Takeshi Sakamoto
Life of this patent
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Abstract
There is provided an optical receiving apparatus, including a receiver configured to perform coherent reception by mixing first light of a received optical signal and second light generated by a local oscillator, a monitor configured to monitor a first frequency of the first light, and a controller configured to control a second frequency of the second light, based on a difference between the first frequency and the second frequency so as to reduce the difference.
Claims11
An optical receiving apparatus, comprising:
- a receiver configured to perform coherent reception by mixing first light of a received optical signal and second light generated by a local oscillator;
- a monitor configured to monitor a first frequency of the first light;
- and
- a controller configured to control a second frequency of the second light, based on a difference between the first frequency and the second frequency so as to reduce the difference.
1 more element
An optical receiving apparatus, comprising:
- a wavelength de-multiplexer configured to perform wavelength de-multiplexing on a wavelength division multiplexing optical signal;
- a plurality of receivers configured to perform coherent reception by mixing first light of optical signals having de-multiplexed wavelengths and second light generated by local oscillators, each of the plurality of receivers being arranged corresponding with each of the de-multiplexed wavelengths;
- a monitor configured to monitor first frequencies of the first light;
- and
- a controller configured to control second frequencies of the second light, based on each of differences between the first frequencies and the second frequencies so as to reduce each of the differences.
2 more elements
An optical receiving apparatus, comprising:
- a branch unit configured to branch a wavelength division multiplexing optical signal, each of the branched optical signals corresponding with each of a plurality of paths;
- a plurality of receivers configured to perform coherent reception by mixing first light of optical signals having a wavelength passed from the branched optical signals and second light generated by local oscillators, each of the plurality of receivers being arranged corresponding with each of the plurality of paths;
- a monitor configured to monitor first frequencies of the first light;
- and
- a controller configured to control second frequencies of the second light, based on each of differences between the first frequencies and the second frequencies so as to reduce each of the differences.
2 more elements
Dependencies are inferred from the claim text.