Patent ID: 8050573

Claim:
An optical burst receiver that converts an optical burst signal from a current signal to a voltage signal to receive: a burst signal; an optical burst signal including a guard time, a preamble signal including a gain switching preamble signal, a peaking preamble signal, and a duty adjustment preamble signal; and a data signal, the optical burst receiver comprising: a transimpedance amplifier that converts the optical burst signal from a current signal to a voltage signal, controls the gain of the preamble signal including the peaking preamble signal and the duty adjustment preamble signal and the data signal according to a voltage level of the gain switching preamble signal, and outputs a differential signal; a peaking/adder circuit that detects the peaking preamble signal of the differential signal from the transimpedance amplifier, sets the peaking level to a normal phase and a reversed phase, and adjusts an offset signal of the preamble signal including the gain switching preamble signal and the duty adjustment preamble signal and the data signal; an automatic threshold control buffer circuit that controls the duty of an output signal from the peaking/adder circuit by a threshold voltage; a duty detection circuit that detects a burst signal outputted from the automatic threshold control buffer circuit, masks the gain switching preamble signal and the peaking preamble signal in the preamble signal included in the detected burst signal, detects the duty ratio of a duty switching preamble signal, and converts the burst signal to a voltage signal corresponding to the duty ratio; a threshold voltage adjustment circuit that adjusts the duty ratio of the gain switching preamble signal, the peaking preamble signal, and the data signal for the automatic threshold control buffer circuit by a new threshold voltage in accordance with the size of the voltage signal corresponding to the duty ratio from the duty detection circuit; and the reset control circuit that can output a reset signal that confirms the arrival of the burst signal, set the transimpedance amplifier to an initial gain by the reset signal, reset the peaking level of the peaking/adder circuit, and detect the burst signal of the duty detection circuit.