Coherent optical reception device and coherent optical reception method

A coherent optical reception device comprising:

• a coherent receiver that receives signal light in which an auxiliary management and control channel (AMCC) signal is superimposed on a main signal by phase modulation, converts the signal light into an analog electric signal, and outputs an in-phase component and a quadrature-phase component of the reception signal;
• and
• a digital signal processor that demodulates a code sequence of the AMCC signal and a code sequence of the main signal from the reception signal by performing digital signal processing on the reception signal, wherein
• a modulation signal of the AMCC signal superimposed on the main signal is multiplied by a clock,
• the digital signal processor includes
• a symbol output that extracts and outputs a symbol of the main signal from the reception signal output from the coherent receiver, an AMCC signal code sequence demodulator that demodulates a code sequence of the AMCC signal, and a main signal code sequence demodulator that demodulates a code sequence of the main signal, and
• the AMCC signal code sequence demodulator includes
• a main signal component remover that removes the main signal included in the reception signal output from the symbol output and
• a clock component remover that removes a clock component included in the reception signal after the main signal is removed by the main signal component remover.