Adaptive equalizer suitable for use with fiber optics

Details Adaptive equalizer suitable for use with fiber optics Adaptive equalizer suitable for use with fiber optics

1983-07-26

1985-08-27

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

375 11, 333 28R, H04B 112

Patent

active

045382832

ABSTRACT:
A circuit for adaptively equalizing a digital signal to compensate for distortion introduced by a transmission medium. The circuit includes a first feedback path for modifying the input signal which is to be equalized to an extent controlled by a control input signal. A second feedback path modifies the input signal to an extent which tends to overcompensate the signal for the transmission distortion. Further, means are provided to modify the signal so as to undercompensate it for the transmission distortion. Error detectors detect pseudo bit errors in the overcompensated and the undercompensated signal, and a control input signal is generated for the first feedback path, dependent on the difference between the errors detected in the overcompensated and undercompensated signal. As a result, the modification of the signal in the first feedback path produces an equalization appropriate to the transmission distortion, and the circuit adaptively changes the equalization in accordance with changes in the transmission medium.

REFERENCES:
patent: 3721959 (1973-03-01), George
patent: 3792356 (1974-02-01), Kobayashi et al.
patent: 4218771 (1980-08-01), Hogge, Jr.
patent: 4361892 (1982-11-01), Martin
patent: 4415872 (1983-11-01), Karabinis

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