Optical transmission method and optical transmission apparatus

Details Optical transmission method and optical transmission apparatus Optical transmission method and optical transmission apparatus

1996-04-01

1998-01-06

Negash, Kinfe-Michael

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359161, 250214A, H04B 1006

Patent

active

057061181

ABSTRACT:
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.

REFERENCES:
patent: 5325225 (1994-06-01), Suzaki et al.
patent: 5548435 (1996-08-01), Tahara et al.

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