Optical network unit, optical line terminal and method, device and medium for communication

An optical line terminal, comprising:

• at least one processor;
• and
• at least one memory stores instructions that, when executed, cause the optical line terminal at least to perform,
• receiving a plurality of optical signals with different wavelengths from an optical network unit, the plurality of optical signals carrying indication information, which is used to indicate a wavelength serial number of at least one optical signal and temperature information of a laser chip when the at least one optical signal is generated;
• performing coherent detection on the plurality of optical signals to determine the at least one optical signal is successfully detected by the optical line terminal;
• generating temperature adjustment information of the laser chip for the optical network unit based on the at least one optical signal and a local oscillator optical signal of the optical line terminal;
• and
• sending the temperature adjustment information to the optical network unit.

A method for communication, including:

• sending, by an optical network unit, a plurality of optical signals with different wavelengths to an optical line terminal in a coherent passive optical network, the plurality of optical signals carrying indication information which is used to indicate a wavelength serial number of at least one optical signal of the plurality of optical signals and a temperature information of a laser chip when the at least one optical signal is generated;
• receiving temperature adjustment information from the optical line terminal, the temperature adjustment information based on an emission wavelength error;
• and
• adjusting, based on the temperature adjustment information, a temperature of the laser chip to adjust an emission wavelength of the at least one optical signal, the adjusted emission wavelength enabling out-of-band frequency tracking in the coherent passive optical network.

A method for communication, including:

• receiving, by an optical line terminal, a plurality of optical signals with different wavelengths from an optical network unit, the plurality of optical signals bearing indication information, the indication information indicating a wavelength serial number of at least one optical signal and temperature information of a laser chip when the at least one optical signal is generated;
• performing coherent detection on the plurality of optical signals to determine the at least one optical signal is successfully detected by the optical line terminal in the plurality of optical signals;
• generating temperature adjustment information of the laser chip for the optical network unit based on the at least one optical signal and a local oscillator optical signal of the optical line terminal;
• and
• sending the temperature adjustment information to the optical network unit.