Apparatus and method for reduction of intermodulation distortion

Details Apparatus and method for reduction of intermodulation distortion Apparatus and method for reduction of intermodulation distortion

1989-08-10

1991-10-22

Eisenzopf, Reinhard J.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359124, H04J 1402, H04B 1004

Patent

active

050603108

ABSTRACT:
A low distortion optic fiber network having a feedback system which injects pilot tones into a base band input signal directly modulating an LED, optically detects the output resulting from the pilot tones, digitally samples the detected signal, and generates correction coefficients. The correction coefficients and the base band input signal are input to a correction circuit that pre-distorts the input signal in a non-linear manner and uses the distorted signal to modulate the LED. Pre-distorting the LED input signal compensates for the non-linearities of diode transfer characteristics and intermodulation between signals in the network thereby reducing harmonic and intermodulation distortion.

REFERENCES:
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IEEE Transactions on Microwave Theory and Techniques, vol. 38, No. 5, May 1990 "Lightwave Subcarrier CATV Transmission Systems" by Thomas E. Darcie and George E. Bodeep.

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