Wavelength tuning method and related device

A wavelength tuning method, comprising:

• receiving, by a central office terminal, a detection signal sent by a remote optical module, wherein the detection signal is loaded into a second optical service signal in a pilot tone manner;
• determining, by the central office terminal, in response to an intensity of a carrier frequency of the detection signal being greater than or equal to a preset value, that an operating wavelength of the remote optical module is within a target wavelength range;
• determining, by the central office terminal, in response to the intensity of the carrier frequency of the detection signal being less than the preset value, that the operating wavelength of the remote optical module is beyond the target wavelength range;
• and
• sending, by a central office terminal, in response to the operating wavelength of the remote optical module being beyond the target wavelength range, a wavelength control signal to the remote optical module, wherein the wavelength control signal indicates a target wavelength to be tuned by the remote optical module, and wherein the wavelength control signal is loaded into a first optical service signal in a pilot tone manner;
• wherein the sending the wavelength control signal to the remote optical module causes the remote optical module to:
• determine a target temperature corresponding to the target wavelength based on a maximum cut-off wavelength and a minimum cut-off wavelength in a target wavelength range, and further based an adjacent wavelength that is in a temperature control list that comprises a correspondence between different temperatures and different wavelengths and that is adjacent, in the temperature control list, to a reference wavelength of wavelengths of the temperature control list having a smallest difference from the target wavelength;
• and
• tune an operating wavelength of the remote optical module to the target wavelength based on the target temperature.

An optical module, comprising:

• at least one processor and a memory coupled with the one or more processors, wherein the memory comprising instructions, when executed by the at least one processor, cause the optical module to:
• receive, through a receiver, a wavelength control signal from a central office terminal, wherein the wavelength control signal indicates a target wavelength to be tuned by the optical module, and wherein the wavelength control signal is loaded into a first optical service signal in a pilot tone manner;
• determine the target wavelength based on the wavelength control signal;
• obtain a temperature control list, wherein the temperature control list comprises a correspondence between different temperatures and different wavelengths;
• determine a target temperature corresponding to the target wavelength based on the temperature control list;
• and
• tuning, by the optical module, an operating wavelength of the optical module to the target wavelength based on the target temperature;
• wherein the instructions that cause the optical module to determine the target temperature corresponding to the target wavelength based on the temperature control list include instructions to cause the optical module to:
• determine a reference wavelength, wherein the reference wavelength is a wavelength that is in wavelengths comprised in the temperature control list and that has a smallest difference from the target wavelength;
• determine an adjacent wavelength comprised in the temperature control list, wherein the adjacent wavelength is a wavelength comprised in the temperature control list and adjacent to the reference wavelength;
• and
• determine the target temperature based on a maximum cut-off wavelength and a minimum cut-off wavelength in the target wavelength range, and the adjacent wavelength.