Tacan Corporation

Ipicom, Inc.

Thomas Edward Cooney

Gary Edwin Winter

A pilot signal is generated and injected into the input ( ) of a signal modulator ( ). The harmonic signal of a pilot signal produced at the output ( ) and due to the non-linear transfer function of the signal modulator ( ) is coherently sampled in the time domain to produce a plurality of digital samples. The digital samples are averaged to produce an average harmonic signal value. The bias voltage at which the signal modulator ( ) is biased is adjusted to minimize the magnitude of the average harmonic signal value.

Method and apparatus for reducing non-linear characteristics of a signal modulator by coherent data collection

A pilot signal is generated and injected into the input (108) of a signal modulator (104). The harmonic signal of a pilot signal produced at the output (110) and due to the non-linear transfer function of the signal modulator (104) is coherently sampled in the time domain to produce a plurality of digital samples defining a digital sample signal. The digital sample signal is cross-correlated with a reference signal having a phase based on the pilot signal to produce a cross-correlation signal. The bias voltage at which the signal modulator (104) is biased is adjusted to minimize the difference between the phase of the correlation signal and an optimum phase value corresponding to a linear mode of operation of the signal modulator 104.

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Carlsbad, CA, United States of America

Thomas Edward Cooney