Temperature compensation circuit used for avalanche photodiode

Abstract

The invention discloses a temperature compensation circuit used for an avalanche photodiode (APD), which comprises a high-precision temperature sensing module, an APD bias control unit and an APD optical detection module, wherein the high-precision temperature sensing module is used for converting a tube core temperature of the APD into an analog voltage signal, an input end of the high-precisiontemperature sensing module is connected with the APD optical detection module, and an output end of the high-precision temperature sensing module is connected with the APD bias control unit; the APD bias control unit is used for converting the voltage signal output by the high-precision temperature sensing module into a bias signal for controlling the APD; and the APD optical detection module is used for feeding back the tube core temperature and making the gain of the APD constant under the control of the bias signal, an input end of the APD optical detection module is connected with the APDbias control unit, and an output end of the APD optical detection module is connected with the high-precision temperature sensing module. The practical high-precision APD bias controlled temperature compensation circuit is designed by using the APD bias control unit consisting of high-voltage controllers and related auxiliary circuit modules, the constant gain working temperature range of the APDis between zero and 50 DEG C, and the gain control precision is higher than 0.5 percent.

Description

technical field [0001] The invention relates to a basic circuit in the technical field of optical communication, in particular to a bias control temperature compensation circuit for a high-precision avalanche photodiode (APD). Background technique [0002] At present, APD is widely used in optical fiber sensing and optical fiber communication network as a kind of photodetection device with high sensitivity, which can accurately receive data and measure optical power. It produces an avalanche multiplication effect with the help of an internal strong electric field, and has a very high internal gain (up to 10-100 orders of magnitude). However, the variation of APD with temperature drift seriously affects the stability of its gain, and even causes the deterioration of measurement accuracy. Theoretically, it can be proved that the gain of the APD is a function of its bias voltage V and temperature T, both of which determine the gain of the APD when it is working, and there is a...

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Problems solved by technology

However, the change of APD with temperature drift seriously affects the stability of its gain, and even causes the deterioration of measurement accuracy

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