Optical receiver reliably detectable loss-of-signal state

摘要: The present invention is to provide an optical receiver that prohibits the miss-detection of recovery from LOS (Loss-Of-Signal) state. includes light-receiver device for converting input signal a photo-current, pre-amplifier this photo-current into voltage signal, and detector detect state based on output pre-amplifier. bottom hold detects keeps level comparator sets thereof when exceeds threshold V TH(−) .