Patent ID: 9419724
Filing Date: 2016-08-16
CPC Classification: H04B

Claim Text:
1. A coherent optical receiver, comprising: a coherent optical receiving part for performing coherent detection by inputting and mixing local oscillation light and main signal light received through a transmission line densified by means of a wavelength division multiplexing with a signal applied at a transmitting side, outputting the signal applied to the main signal light as an electric signal, and regenerating and outputting an original signal on the basis of the electric signal; and a local oscillation optical frequency control part for receiving channel information on a transmission line adjacent to the main signal light, and outputting the local oscillation light after changing a frequency of the local oscillation light to a predetermined frequency corresponding to the main signal light depending on the presence or absence of adjacent channel signal light of other signal light in an adjacent channel, wherein the local oscillation optical frequency control part performs frequency offset control in which the frequency of the local oscillation light is shifted in the direction toward the adjacent channel on the side without adjacent channel signal light, if there is the adjacent channel signal light in only one side of the main signal light.