Single photon avalanche diode optical signal receiving circuit based on adaptive adjustment of ambient light intensity

Abstract

The invention discloses a single photon avalanche diode optical signal receiving circuit based on adaptive adjustment of ambient light intensity. The single photon avalanche diode optical signal receiving circuit comprises a counter, a combinational logic module circuit, a multiplexer, a storage module and a time window generation circuit, the time window generation circuit generates a time window; a counter collects and records the number of photon pulses in a time window; the storage module dynamically stores the count value of the photon pulse number in the ambient light detection mode as the reference value of the signal pulse detection threshold value in the signal detection mode, and controls the output of the multiplexer; the combinational logic module circuit combines binary output bit numbers of the counter to represent different count values; the multiplexer takes different count values in the combinational logic module circuit as input signals; the output of the storage module is connected with the gating control end of the multiplexer, and the count value, larger than or equal to the signal pulse detection threshold reference value, in the input signals of the multiplexer is controlled to serve as the output.

Description

technical field [0001] The invention relates to the technical field of optical signal receiving circuits, and more particularly, to a single-photon avalanche diode optical signal receiving circuit based on adaptive adjustment of ambient light intensity. Background technique [0002] In optical fiber communication, wireless optical communication, lidar and other applications that use light as an information carrier, a high-sensitivity receiving circuit can not only improve the quality of the received signal, increase the communication and detection distance, but also reduce the power consumption of the transmitter. It is essential for the system to operate efficiently and reliably. Compared with traditional photodiodes, SPADs operating in Geiger mode have higher photoelectric conversion gain and are suitable as high-sensitivity optical signal detection devices. [0003] like figure 1 , 2 As shown, the output current of the SPAD usually needs to be connected to a resistor o...

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Problems solved by technology

[0005] In order to solve the problem that the existing SPAD-based optical signal receiving circuit is difficult to detect and filter out the interference pulse in real-time in the application environment where the illumination conditions are constantly changing, the present invention provides a single photon sensor based on the adaptive adjustment of the ambient light intensity. An avalanche diode optical signal receiving circuit, which detects changes in ambient light in real time through time-division multiplexing of the circuit and dynamically sets the reference value of the signal pulse detection threshold in the optical signal receiving circuit, thereby filtering out the time-correlated signals detected in the receiving circuit sexual interfering pulse

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