Equalizer for optical communication systems

Details Equalizer for optical communication systems Equalizer for optical communication systems

1992-06-29

1995-01-03

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

333 18, 333 28R, 359180, 327325, 327586, H03K 326, G06G 712, H03G 1104, H03H 500

Patent

active

053789377

ABSTRACT:
To compensate for nonlinear signal distortions in analog optical communication transmission systems, caused by laser chirps and the chromatic dispersion of the optical fiber, an equalizer in the form of an LC component is known, whose capacitance is formed by a variable capacitance diode. However, the known equalizer functions only when the capacitance has the proper polarity, which cannot be predicted because of possible polarity inversion during signal transmission. According to the invention, the variable capacitance diode (C.sub.a) has another variable capacitance diode (C.sub.b), with the opposite polarity, connected in parallel, and is equally biased in the high-resistance direction. By adjusting the bias voltage of both capacitances, it can be achieved that one of the two variable capacitance diodes takes over the equalization function, and the other is practically inoperative. Further developments of this solution concern keeping the frequency response constant during adjustment of the equalization, by means of a capacitance connected in parallel to the variable capacitance diodes (C.sub.a, C.sub.b), and the equalization of large bandwidth signals by an LC chain circuit with LC components according to the invention.

REFERENCES:
patent: 5302922 (1994-04-01), Heidemann et al.
"Electrical Predistortion to Compensate for Combined Effect of Laser Chirp and Fibre Dispersion", H. Gysel et al, Electronics Letters, Feb. 28, 1991, vol. 27, No. 5, pp. 421-423.
"Equalizer for Step-Index Fiber Transmission System", K. Yamaguchi et al, Third European Conference on Optical Communication, Sep. 1977, Munich, pp. 202-204.
"Passive Equalization of Semiconductor Diode Laser Frequency Modulation", S. Alexander et al, Journal of Lightwave Technology Jan. 1989, New York, vol. 7, No. 1, pp. 11-23.

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