Calibration system for wavelength-division multiplexing, wavelength-division multiplexing system, and calibrating method for wavelength-division multiplexing

A wavelength-division multiplexing (WDM) system, comprising:

• a WDM demultiplexer comprising a first channel and a second channel;
• a first heating device coupled to the first channel;
• a second heating device coupled to the second channel;
• a first thermal sensor coupled to the first channel, configured to sense a first temperature of the first channel;
• and
• a first optical sensor coupled to the first channel, configured to detect a first optical signal,
• wherein the first heating device is configured to either adjust or maintain a first temperature of the first channel based on the detected first optical signal and the first temperature, and the second heating device is configured to either adjust or maintain a second temperature of the second channel based on the detected first optical signal and the first temperature.

A method for wavelength-division multiplexing (WDM), comprising:

• detecting a first optical signal from a first channel of a WDM demultiplexer by a first optical sensor;
• sensing a first temperature of the first channel by a first thermal sensor;
• based on the detected first optical signal and the first temperature, adjusting or maintaining the first temperature of the first channel by a first heating device;
• detecting a second optical signal from a second channel of the WDM demultiplexer by a second optical sensor;
• sensing a second temperature of the second channel by a second thermal sensor;
• and
• based on the detected second optical signal and the second temperature, adjusting or maintaining the second temperature of the second channel by a second heating device.