Optical waveguides – Temporal optical modulation within an optical waveguide – Electro-optic
Patent
1994-07-27
1995-03-21
Popek, Joseph A.
Optical waveguides
Temporal optical modulation within an optical waveguide
Electro-optic
385 3, 359245, 359246, G02B 610
Patent
active
054004179
ABSTRACT:
An electro-optic modulator includes a closed loop bias control system for maintaining the modulator at its half-power point by modulating a time varying signal on and off at a modulation frequency f.sub.m. The modulation frequency f.sub.m is much lower than the frequency components within the spectrum of the time varying signal, such that, energy within the time varying signal spectrum is recovered at the modulation frequency when the modulator is not operating at the half-power point. A phase sensitive demodulator operating at the modulation frequency f.sub.m demodulates a signal indicative of the modulator optical output signal to provide a DC voltage signal value indicative of the half-power point bias error value. The time varying voltage signal may be a dither noise signal or any other time varying signal such as a signal with a single frequency component (e.g. a sine or cosine) or a signal with a plurality of frequency components (e.g., a square wave).
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Allie David J.
Farina James D.
Mai Son
Popek Joseph A.
United Technologies Corporation
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