TUNING TYPE OPTICAL RECEIVER

摘要

PURPOSE:To secure a necessary band width and to enable the transmission in high bit rate by using a circuit obtained by connecting plural tuning amplification circuits whose resonance frequencies are different in multistage. CONSTITUTION:A tuning amplification is formed by connecting an amplifier 2 to a tuning circuit consisting of the capacity component of a light receiving terminal 1 and an inductive element 4 and at least one tuning amplifier consisting of the tuning circuit 3 and the amplifier 2 is coutinously connected to the above-mentioned tuning amplifier in order that the resonance (tuning) frequency of the tuning circuit formed with the photodetector 1 including the capacity component and the inductive element and the resonance frequency of the respective tuning circuits 3 are adjusted to be a little different each other. The signal of the resonance (tuning) frequency of the tuning circuit formed with the photodetector 1 including the capacity component and the inductive element 4 is amplified in the amplifier 2 and also the signal of the frequency which is a little different from the above-mentioned one is tuned and amplified in the tuning circuit 3 and the amplifier 2 which are continuously connected. Moreover the signal of the frequency a little different from the former one is tuned and amplified in the tuning circuit 3 and the amplifier 2 which are continuously connected moreover.