Patent ID: 8331793

Claim:
An optical transmission apparatus transmitting and receiving an optical signal generated by a multi-level modulation system capable to transmit multi-bit information within one symbol-time, the optical transmission apparatus comprising: a transmitting OTL processor to rearrange a data string stored in a frame into a plurality of logical lanes, and set a lane ID used to identify in which logical lane a beginning of the data string is arranged among the plurality of logical lanes in a non-scramble area in an overhead part of the frame; an optical transmitter to multiplex the data string rearranged into the plurality of logical lanes by the transmitting OTL processor corresponding to the multi-level modulation system, and generate a modulated optical signal based on the multiplexed data signal; an optical receiver to decode a received optical signal generated by the multi-level modulation system so as to regenerate a reception data, and rearrange a data string of the reception data in physical lanes of a same number as the logical lane; and a receiving OTL processor to respectively identify the lane IDs included in the data string in the respective physical lanes rearranged by the optical receiver, determine a generation state of a bit inversion and a lane replacement for each physical lane, compensate the bit inversion and the lane replacement so that the data string in the respective physical lanes becomes same state as the data string in the respective logical lanes, based on the identified result, and rearrange the compensated data string in the respective logical lanes so as to regenerate the frame.