OPTICAL RECEIVER

摘要

PURPOSE:To provide a receiver for the transmission of the frequency multiplexed optical signal having high sensitivity especially for the transmission of the frequency multiplexed AM/FM hybrid optical video signal. CONSTITUTION:The optical receiver receives the optical signal which is emphasized and modulated by the frequency multiplexed signal modulated by plural carriers through a photoelectric transducer 11. The output of the transducer 11 is amplified by the preamplifiers 14 and 15 and outputted at every frequency band after the bands of the frequency multiplexed signal are separated by a branching filter. The impedances included in the pass bands of the filters 12 and 13 connected in parallel and forming the branching filter are matched with the input impedances of both amplifiers 14 and 15 respectively. Then the impedances are increased enough at the bands except the bass bands of both filters 12 and 13.