| 摘要 |
Provided is an optical transmission device for transmitting and receiving a multilevel-modulated optical signal, including: a plurality of transmission frame processors (212 to 214, 222 to 224) for generating transmission frame signals accommodating a plurality of client signals that are each subjected to error correction processing and scrambling/descrambling processing; and a digital modulator/demodulator (215) for mapping the transmission frame signals that are input to and output from the plurality of transmission frame processors to a multilevel signal and performing digital modulation/demodulation, in which the plurality of transmission frame processors each have a function of shifting a phase of a pattern between a plurality of transmission frames to be mapped to a multilevel signal and be digitally modulated/demodulated. |
