Patent ID: 11916599
Assignee: HUAWEI TECHNOLOGIES CO., LTD.
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 4:
5. 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.