An optical noise removal circuit, comprising: a noise filter unit, wherein an input end of the noise filter unit receives an electrical signal coming from an photoelectric conversion unit, and the noise filter unit is configured to filter out a noise electrical signal, in the electrical signal, that is generated due to ambient light, and output a target pulse signal at an output end; and a comparison unit, wherein a first input end of the comparison unit is coupled to the output end of the noise filter unit to receive the target pulse signal, and the comparison unit is configured to output a digital signal based on comparison between the target pulse signal and a reference voltage; wherein the noise filter unit comprises: a diode, wherein a positive electrode of the diode is coupled to the photoelectric conversion unit, and a negative electrode of the diode is coupled to the first input end of the comparison unit; wherein the optical noise removal circuit further comprises: a clamping resistor, wherein the clamping resistor is connected to the photoelectric conversion unit in series, a first end of the clamping resistor is coupled to one end of the photoelectric conversion unit and the positive electrode of the diode, a second end of the clamping resistor is grounded, the other end of the photoelectric conversion unit is connected to a supply voltage, the clamping resistor clamps a voltage on the positive electrode of the diode to a voltage level that is less than a conduction voltage of the diode when there is no exposure to a signal light source and that is greater than the conduction voltage of the diode when there is exposure to a signal light source. a noise filter unit, wherein an input end of the noise filter unit receives an electrical signal coming from an photoelectric conversion unit, and the noise filter unit is configured to filter out a noise electrical signal, in the electrical signal, that is generated due to ambient light, and output a target pulse signal at an output end; and a comparison unit, wherein a first input end of the comparison unit is coupled to the output end of the noise filter unit to receive the target pulse signal, and the comparison unit is configured to output a digital signal based on comparison between the target pulse signal and a reference voltage; wherein the noise filter unit comprises: a diode, wherein a positive electrode of the diode is coupled to the photoelectric conversion unit, and a negative electrode of the diode is coupled to the first input end of the comparison unit; wherein the optical noise removal circuit further comprises: a clamping resistor, wherein the clamping resistor is connected to the photoelectric conversion unit in series, a first end of the clamping resistor is coupled to one end of the photoelectric conversion unit and the positive electrode of the diode, a second end of the clamping resistor is grounded, the other end of the photoelectric conversion unit is connected to a supply voltage, the clamping resistor clamps a voltage on the positive electrode of the diode to a voltage level that is less than a conduction voltage of the diode when there is no exposure to a signal light source and that is greater than the conduction voltage of the diode when there is exposure to a signal light source.