Wave transmission lines and networks – Automatically controlled systems – With control of equalizer and/or delay network
Patent
1992-06-29
1994-04-12
Gensler, Paul
Wave transmission lines and networks
Automatically controlled systems
With control of equalizer and/or delay network
333 28R, 333164, 359180, H03H 703
Patent
active
053029224
ABSTRACT:
To compensate for nonlinear 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. If this equalizer is to be adjusted for considerable signal distortions (long transmission path length), it must operate at great capacitance, which reduces its bandwidth. In order to be able to equalize large bandwidth signals (e.g. 600 MHz) containing considerable distortions, the invention indicates an LC chain circuit with LC components of the known type, as the equalizer. Further developments of this solution concern the appropriate polarizing of the variable capacitance diode and maintaining the frequency response constant, when adjusting the equalization.
REFERENCES:
patent: 4855696 (1989-08-01), Tan et al.
patent: 5014018 (1991-05-01), Rodwell et al.
patent: 5023574 (1991-06-01), Anklam et al.
"Electrical Predistortion to Compensate for Combined Effect of Laser Chirp and Fibre Dispersion", H. Gysel et al., Electronics Letters, Feb. 2, 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, vol. 7, No. 1, Jan. 1989, pp. 11-23.
"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.
Heidemann Rolf
Junginger Bernhard
Krimmel Heinz
ALCATEL N.V.
Gensler Paul
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