Double closed-loop based avalanche photo diode (APD) reverse bias voltage control circuit and method

Abstract

The invention discloses a double closed-loop based avalanche photo diode (APD) reverse bias voltage control circuit and method. The double closed-loop based APD reverse bias voltage control circuit comprises a control circuit, a reverse bias voltage supply circuit, a current mirror circuit and a feedback circuit, wherein the input end of the reverse bias voltage supply circuit is connected with the control circuit, voltage output by the reverse bias voltage supply circuit is loaded onto an APD through the current mirror circuit, the feedback circuit feeds reverse bias voltage of the APD to the control circuit, and the control circuit adjusts voltage output by the control circuit to the reverse bias voltage supply circuit according to voltage output by the feedback circuit. Whole closed-loop control is formed by adopting the feedback circuit, accordingly the control circuit can adjust the control voltage output by the control circuit, and stability and accuracy of the reverse bias voltage on the APD are ensured.

Description

technical field [0001] The invention relates to optical fiber communication technology, in particular to an APD reverse bias voltage control circuit and a control method based on double closed loops. Background technique [0002] In the current domestic market and international market, the direction of high-bandwidth, high-speed and multi-service integration of optical fiber communication has begun to be applied; among many solutions, the emergence of fiber-to-the-home (FTTH) is considered to be the ultimate broadband access. solution. The domestic market has been widely used. [0003] In optical fiber communication systems, laser detectors are widely used in various optical modules or optical transceivers, such as in the central office OLT (Optical Line Terminator) equipment set in the access network system of the optical fiber communication system. Or applied to the ONU (optical net unit, optical network unit) optical module set at the central office to detect and receiv...

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Problems solved by technology

[0011] However, in practical applications, the inventors of the present invention have found that the APD bias circuit of the prior art provides a reverse bias voltage for the APD and sometimes there is a large deviation from the set value, that is, the APD bias voltage of the prior art The voltage stability of the circuit output is not good

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