Delay distortion compensating circuit for optical transmission s

Details Delay distortion compensating circuit for optical transmission s Delay distortion compensating circuit for optical transmission s

1991-01-03

1992-05-19

Gonzalez, Frank

Coherent light generators

Particular component circuitry

Optical pumping

372 26, H01S 300

Patent

active

051154404

ABSTRACT:
A delay distortion compensating circuit for a laser driven optical transmission system comprises a varactor network for producing a time shift of the instantaneous amplitude of the modulation signal applied to the laser that is inverse to the time shift caused by chromatic dispersion of a fiber optic cable used for propagating the output of the laser and laser chirp so that the sum of the two time shifts is substantially equal to a constant. In one embodiment the cathode of the varactor diode is coupled to a center tap of an inductor called a first order delay equalizer, the terminals of which are connected to a source of a modulating signal and the laser. A d-c bias is applied to the varactor by means of a choke. In another embodiment called a low pass structure, a modulating signal is coupled to the laser through an inductor and a parallel combination of a discrete capacitor and a varactor diode is coupled between ground and a node located between the inductor and the laser. D-c bias is provided to the varactor by means of a resistor.

REFERENCES:
patent: 4677630 (1987-06-01), Fujita et al.
patent: 4785454 (1988-11-01), Olsson et al.
patent: 4789987 (1988-12-01), Fraser
patent: 4884278 (1989-11-01), Nishimoto et al.

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