EXTINCTION RATIO CHARACTERISTIC OF RECEIVED OPTICAL SIGNAL IS CONSIDERED IN BURST-MODE OPTICAL RECEIVER, IN WHICH DC OFFSET IS NOT INFLUENCED

摘要

PURPOSE: A burst-mode optical receiver using an extinction ratio characteristic of a received optical signal is provided to minimize distortion of a waveform of an output signal by detecting correctly a top peak voltage and a bottom peak voltage of a real burst packet. CONSTITUTION: A photo diode(PD1) is used for converting an optical signal having an extinction ratio characteristic and a burst characteristic to a current signal. A pre-amplifier(300) is used for converting the current signal to a voltage signal and amplifying the voltage signal. A first peak detector(310) is used for detecting a top peak voltage and a bottom peak voltage and outputting an intermediate value of the top peak voltage and the bottom peak voltage as a first reference voltage. A first limiting amplifier(320) is used for amplifying a difference between the amplified signal of the pre-amplifier and the first reference voltage. A buffer(350) is used for buffering an output signal of the first limiting amplifier. A first bottom peak detector(360) is used for outputting a bottom peak of an output signal of the buffer as a control signal.