Time division multiplexing closed loop feedback thermal control method and system

A time division multiplexing closed loop feedback thermal control system, comprising:

• k refractive index information acquiring units,
• a multiplexer,
• a temperature control unit,
• a demultiplexer,
• k drives,
• k heaters,
• k integrated photonic devices, and
• a timing control unit,
• wherein the multiplexer includes k input ends, an output end and a control end, and the demultiplexer includes k output ends, an input end and a control end, in which k is an integer greater than 1;
• the k input ends of the multiplexer are respectively connected to the k refractive index information acquiring units, the output end of the multiplexer is connected to one end of the temperature control unit, the other end of the temperature control unit is connected to the input end of the demultiplexer, the k output ends of the demultiplexer are respectively connected to the k drives and the k drives are respectively connected to the k heaters;
• the k heaters respectively control temperatures of the k integrated photonic devices, the refractive index information acquiring units are configured to respectively acquire refractive indexes of the integrated photonic devices, the drives are configured to respectively drive the heaters, and the refractive indexes of the integrated photonic devices vary with temperature;
• the timing control unit is respectively connected to the control end of the multiplexer and the control end of the demultiplexer, and is configured to control cyclic breakover of an i-th control loop in a time division multiplexing manner, so that the temperature control unit acquires refractive index information of an i-th integrated photonic device by an i-th refractive index information acquiring unit and adjusts a temperature of the i-th integrated photonic device by an i-th heater to control the refractive index of the i-th integrated photonic device to be maintained at a desired value;
• the i-th control loop is a loop composed of the i-th integrated photonic device, the i-th refractive index information acquiring unit, an i-th input end of the multiplexer, the temperature control unit, an i-th output end of the demultiplexer, an i-th drive and the i-th heater, in which 1≤i≤k, and i represents an integer.