Optical receiving module, optical receiving device, and frequency adjustment method

An optical receiving device, comprising at least one processor and an optical receiver, wherein the optical receiver comprises a local oscillator laser, a coherent receiver, and a signal processor, and wherein:

• the optical receiving module is configured to receive a target optical signal, and obtain a target digital electrical signal based on the target optical signal, wherein:
• the local oscillator laser is configured to output a local oscillator laser signal;
• the coherent receiver is configured to receive the target optical signal and the local oscillator laser signal, and output the target digital electrical signal based on the target optical signal and the local oscillator laser signal;
• the signal processor is configured to:
• obtain a current power value of the target digital electrical signal;
• and
• obtain a target frequency offset based on the current power value and a target mapping relationship, wherein the target frequency offset is a difference between a current center frequency of the local oscillator laser signal and a target center frequency of the target optical signal, and the target mapping relationship comprises a correspondence between a power value and a frequency offset;
• and
• the signal processor is further configured to adjust a center frequency of the local oscillator laser when the target frequency offset is greater than or equal to a first threshold;
• and
• the at least one processor is configured to receive the target digital electrical signal, and perform data processing on the target digital electrical signal.

A frequency adjustment method, comprising:

• outputting a local oscillator laser signal via a local oscillator laser;
• obtaining a target digital electrical signal based on the local oscillator laser signal and a target optical signal;
• obtaining a target frequency offset based on a current power value of the target digital electrical signal and a target mapping relationship, wherein the target frequency offset is a difference between a current center frequency of the local oscillator laser signal and a target center frequency of the target optical signal, and the target mapping relationship comprises a correspondence between a power value and a frequency offset;
• and
• adjusting a center frequency of the local oscillator laser when the target frequency offset is greater than or equal to a first threshold.