Offset control for burst-mode optical receiver

摘要

An optical receiver having a photodiode (101) and a preamplifier (102) includes a charge controller (109-112) which charges a capacitor (C1) depending on an received voltage signal at each burst timing of the burst-mode signal and then discharges the capacitor with a predetermined time constant to produce an amplitude-varying offset signal (SC2). The current signal (IC) of the photodiode is controlled depending on the amplitude-varying offset signal so that an amplitude-varying offset component (IOFFSET) is canceled out.