Optical waveguides – Temporal optical modulation within an optical waveguide – Electro-optic
Patent
1999-02-22
2000-10-03
Palmer, Phan T. H.
Optical waveguides
Temporal optical modulation within an optical waveguide
Electro-optic
385 1, 385 2, 385 8, 385147, 359223, 342368, G02F 1035
Patent
active
061284211
ABSTRACT:
An electro-optical phased array beam modulator is an apparatus for modulating a polarized coherent light source to produce a directionally controlled output beam which can be continuously steered in two separate dimensions by two independently controlled input control signals. It includes a waveguide bundle comprising a multiplicity of similar phase modulator elements with an input end into which polarized coherent light is received and an emitting end on which is located an emitting array from which phase shifted light emerges. It includes an electronic control circuit to convert two input control signals into four corner voltages, which are applied across a resistor grid array and then linearly distributed to the individual phase modulator elements by means of column and row resistor elements, so as to produce a planar voltage distribution pattern of transverse voltages applied across the individual phase modulator elements, corresponding to the required direction of the output beam defined by the two input control signals. A phase shift is induced in the light passing through each phase modulator element proportional to the magnitude of such transverse voltage and the length over which it is applied. Constructive and destructive interference of the light occurs as it emerges from the emitting elements of the emitting array, forming a wave front, the orientation of which is dependent upon the combined effect of the phase shift pattern induced in all the phase modulator elements by such planar voltage distribution pattern.
REFERENCES:
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patent: 4764738 (1988-08-01), Fried
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patent: 5751248 (1998-05-01), Thaniyavarn
patent: 5777312 (1998-07-01), Hanson
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