The present disclosure describes an optical device, a system including an optical receiver, and a system including an optical module. The optical device includes an Avalanche Photodiode (APD), a circuit board, a boost circuit disposed on the circuit board, a processor disposed on the circuit board and configured to control an output voltage of the boost circuit, and a probe point disposed on the circuit board. The boost circuit includes a control terminal electrically connecting to the processor. The boost circuit also includes an output terminal electrically connecting to the APD and the probe point respectively.