TEC temperature control method and device for single-photon detector

Abstract

The invention provides a TEC temperature control method and device for a single-photon detector. A DAC chip inputs voltage VDAC to a temperature control circuit according to a DAC digital signal control value; electronic elements R1, R2, R3 and R4 in the temperature control circuit shunt voltage VDAC and then are coupled through a capacitor bank, and finally voltage V-TEC-P / N for adjusting the temperature of a TEC refrigerator is loaded to the two voltage input ends of the TEC refrigerator. According to the invention, the following modes are adopted in sequence: different power supply chips are selected or resistance values of resistors obtained after R3 and R4 are freely combined are used, adjustment of the upper limit of current or voltage is achieved, a temperature control algorithm ofthe TEC is embedded into a main control unit, a TEC refrigeration driving chip is not needed, and a temperature value and a PID parameter value of a single-photon detector module controlled by the TECrefrigerator are placed in a memorizer to sequentially solve and achieve the problems of insufficient voltage or current output of the TEC refrigeration chip, the purpose of unified parameter allocation, the purpose of flexible hardware circuit design and cost reduction, and poor parameter consistency of a TEC refrigeration hardware platform realized by a conventional TEC driving chip are solved.

Description

technical field [0001] The invention relates to the field of quantum communication, in particular to a temperature control method and device for a single photon detector TEC. Background technique [0002] Quantum information technology is one of the most cutting-edge information science technologies at present. In view of the existing technical level, quantum communication is the first technology to achieve commercialization in quantum information science and technology. Single-photon detectors are needed in quantum communication, which requires photoavalanche diodes (APDs) to have high sensitivity. High-performance and stable single-photon detectors are crucial to the entire quantum communication system. [0003] Performance parameters of single photon detectors include: detection efficiency, dark count, and afterpulse probability. Specifically, the detection efficiency is affected by the following factors: the coupling between the optical fiber and the APD active region, ...

AI Technical Summary

Problems solved by technology

[0009] The present invention provides a single photon detector TEC temperature control method and its device, which are used to solve the problem that the driving current of the TEC drive chip in the prior art has limitations; Adaptive circuit, when adjusting the target temperature or thermal load of the single photon detector, it is necessary to adjust the circuit hardware parameters, resulting in poor consistency of the circuit parameters of each hardware platform

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