Equalizer for optically transmitted analog information signals

US5302922A · kind A · utility

Assignee

• Alcatel N.V. · NL

Inventors

• Rolf Heidemann · Zöblitz, DE
• Heinz Krimmel · Ditzingen, DE
• Bernhard Junginger · Herrenberg, DE

Key dates

• Filing date: Jun 29, 1992
• Grant date: Apr 12, 1994
• Expiry date: Jun 29, 2012

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04B10/25137
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

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.