Optical transmitter, optical receiver, and optical transmission method

An optical receiver comprising:

• a receiving unit configured to receive a signal on which an index for indicating an order of signal lanes is superimposed as a frequency offset, wherein the order of signal lanes is designated by an optical transmitter;
• a frequency offset estimation unit configured to detect the frequency offset from the received signal so as to calculate a lane rearrangement index based on the frequency offset, wherein the lane rearrangement index corresponds to the index;
• a signal sequence transformation unit configured to transform the received signal to a plurality of signal lanes;
• a lane reconstruction unit configured to reconstruct the signal lanes according with an original order by rearranging an order of the signal lanes based on the lane rearrangement index;
• and
• a multiplexer configured to reform a data frame by serially converting the signal in the reconstructed signal lanes.

An optical transmission method comprising:

• dividing a data frame of a transmission signal into subframes with a predetermined length so as to form the subframes in a plurality of signal lanes;
• rearranging the signal lanes based on an index for indicating an order of the signal lanes;
• and
• superimposing the index on the transmission signal as a frequency offset of a carrier of the transmission signal, by an optical transmitter.