Frequency offset detection and correction in optical spectrum measurement systems

A controller adapted for frequency offset detection in an optical spectrum measurement device, the controller comprising:

• a processor;
• and
• memory storing instructions that, when executed, cause the processor to
• determine a reference optical spectrum based on expected channels and their associated spectral occupancy without extracting any information from actual received optical spectrum,
• obtain a measured optical spectrum from the optical spectrum measurement device, and
• perform a frequency offset control loop using the reference optical spectrum and the measured optical spectrum to correct frequency offset in the optical spectrum measurement device;
• wherein the reference optical spectrum is determined based on provisioning data which provides the expected channels and their center frequency and hardware capabilities which provide the associated spectral occupancy of the expected channels.

An apparatus adapted for frequency offset detection in an optical spectrum measurement device, the apparatus comprising:

• circuitry adapted to determine a reference optical spectrum based on expected channels and their associated spectral occupancy without extracting any information from actual received optical spectrum;
• circuitry adapted to obtain a measured optical spectrum from the optical spectrum measurement device;
• and
• circuitry adapted to perform a frequency offset control loop using the reference optical spectrum and the measured optical spectrum to correct frequency offset in the optical spectrum measurement device;
• wherein the reference optical spectrum is determined based on provisioning data which provides the expected channels and their center frequency and hardware capabilities which provide the associated spectral occupancy of the expected channels.