In-line predistorter for linearization of electronic and optical

Details In-line predistorter for linearization of electronic and optical In-line predistorter for linearization of electronic and optical

1996-11-27

1998-08-25

Pascal, Leslie

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

327362, 332160, 359180, 359188, H04B 1018

Patent

active

057988544

ABSTRACT:
An electronic circuit provides a linear output from a nonlinear transmission device such as a laser. Second and higher order distortion of the nonlinear device is compensated by applying a predistorted signal equal in magnitude and opposite in sign to the real and imaginary components of distortion produced by the nonlinear device. The input signal for the nonlinear device is applied to an in-line electrical path coupled to the nonlinear device. The in-line path contains at least one component for generating primarily real components of distortion. In some applications, at least one component for generating imaginary components of distortion is located on the in-line path. Filter stages are used to provide frequency dependent predistortion. In a preferred embodiment, an attenuator, a MMIC amplifier, a CATV hybrid amplifier, and a varactor in line with a semiconductor laser, provide the predistorted signal. In another embodiment, the real component of predistortion is generated by a FET configured as a voltage controlled resistor. In still another embodiment, the real component of predistortion is generated by the parallel combination of a diode and a resistor connected in series with the RF signal path. Also provided is a separate circuit including antiparallel diodes and reactive elements for generating frequency dependent third-order predistortion.

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M. Bertelsmeier, "Linearization of Optical Transmitters for the Transmission of Analog Signals via Light Wave Conductors"--Department of Science of Electrical Communications Technological Institute, Darmstadt, Germany, Sections 2.4 through 7.1.1, 1984.

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