Controllable electro-optical modulator/phase shifter using an integrated optical interferometer
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United States of America Patent
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May 8, 1984
Grant Date -
N/A
app pub date -
Apr 7, 1982
filing date -
Apr 9, 1981
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An optical waveguide interferometer arrangement includes a single-mode optical waveguide device which diverges into two waveguide branches of identical optical length which converge into another single waveguide. The optical properties of the two branches are variable by electrical fields applied via adjacent electrodes, which are energized with a composite waveform comprising (for example) a symmetrical ramp superimposed on a square wave of the same period. The two component waveforms are in phase but of different amplitudes such that the output light is intensity modulated at a frequency which is some multiple of that of the input waveforms. Adjustment of the square wave amplitude provides the means to phase shift the optical output signal.
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