Modulators – Amplitude modulator – Nonlinear device controlled by modulating signal
Patent
1981-05-06
1983-06-07
Moskowitz, Nelson
Modulators
Amplitude modulator
Nonlinear device controlled by modulating signal
350374, 350392, 350396, G02F 128, G02F 300
Patent
active
043873430
ABSTRACT:
In a light modulator wherein a modulator medium, such as an a-cut lithium tantalate plate, has a Pockels coefficient for converting one of orthogonally polarized components of a light beam to the other thereof in cooperation with an electric field produced in the medium in a direction predetermined relative to the thickness of the medium while the light beam is transmitted between a pair of end surfaces of the medium and wherein a voltage is supplied between that interdigital electrode pair to produce the electric field, digit electrodes of which are distributed along one of a pair of principal surfaces of the medium at a predetermined pitch between the end surfaces, weights are attached to at least those of the digit electrodes which are distributed adjacent to each end surface. Each weight-attached digit electrode contributes to conversion of the polarization to an extent determined by the weight attached thereto. The weights are gradually varied or reduced as the digit electrodes are distributed nearer to each end surface. It is possible to vary the weights by varying those parts of the electric field which are produced in the medium adjacent to the respective digit electrodes, as by varying the voltage supplied between each successive digit electrode pair or by varying the thickness. Alternatively, the weights are varied by varying the ratio of the width of each digit electrode to the gap by which that digit electrode is spaced from a next following digit electrode.
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patent: 4197008 (1980-04-01), Pinnow et al.
Kondo et al., "Phase-Matched Electro-Optic Light Modulator", 8/31/77, Proc. of the 9th Conf. of Solid State Devices, Tokyo.
Moskowitz Nelson
Nippon Electric Co. Ltd.
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