| 摘要 |
The invention provides a very high speed optical transmission apparatus which is tough against a variation in mark rate using an equalizing amplification circuit of a narrow-band frequency characteristic. The optical transmission apparatus includes an equalizing amplification circuit including a photoelectric conversion circuit for receiving a non-return-to-zero code as a reception signal, a peak value detection circuit, a dc amplifier, a timing extraction circuit, a dc regeneration circuit and an identification circuit. The equalizing amplification circuit includes a differentiating circuit for producing a differentiation equalization waveform of a reception signal of a non-return-to-zero code. The dc regeneration circuit includes a logic circuit for outputting logically positive and negative signals of an output signal of the equalizing amplification circuit, and a set-reset flip-flop circuit for receiving the logically positive signal of the output of the logic circuit as a set signal and receiving the logically negative signal of the output of the logic circuit as a reset signal. A full-wave rectification circuit is provided at an input terminal of the timing extraction circuit. |
