Patent ID: 7369781

Claim:
A burst mode optical receiver comprising: a photo diode, which receives an optical signal having characteristics of a predetermined extinction ratio and burst from outside and converts the received optical signal into a current signal; a preamplifier, which converts the signal converted by the photo diode into a voltage signal, amplifies the voltage-converted signal, and outputs the amplified signal; a first peak detector, which includes a first top peak detector to detect a top peak voltage and a first bottom peak detector to detect a bottom peak voltage of the signal amplified by the preamplifier, and outputs a middle value between the detected top peak voltage and the detected bottom peak voltage as a first reference voltage, the first top peak detector receiving a control signal and a reset signal to discharge a circuit in the first top peak detector to a predetermined DC voltage level during a time period when the optical signal does not exist, the first bottom peak detector receiving an inverted reset signal but not the control signal; a first limiting amplifier, which inputs the signal amplified by the preamplifier and the first reference voltage and amplifies a difference therebetween; a buffer, which buffers the signal limitedly amplified by the first limiting amplifier; and an output bottom peak detector, which detects a bottom peak voltage of the signal output from the buffer and outputs the bottom peak voltage as the control signal.