Optical waveguides – Directional optical modulation within an optical waveguide – Electro-optic
Patent
1995-06-07
1996-10-15
Ngo, John
Optical waveguides
Directional optical modulation within an optical waveguide
Electro-optic
385 10, G02B 610
Patent
active
055662587
ABSTRACT:
A waveguide type electro-optical element is made up of a proton-exchanged optical waveguide formed on a substrate which possesses an electro-optical effect. At least one pair of electrodes is formed on the substrate adjacent to the optical waveguide with a buffer layer being disposed between the substrate and the electrodes. A guide beam propagating through the waveguide is diffracted as a result of the application of a voltage to the electrodes. The buffer layer is made of material which has a specific resistance ranging between 10.sup.7 -10.sup.11 .OMEGA.cm. The optical waveguide may be of a form having a split-type optical waveguide consisting of the combination of two Y-shaped waveguides, and a pair of channel optical waveguides constituting a directional coupler.
REFERENCES:
patent: 5153934 (1992-10-01), Okayama et al.
patent: 5214724 (1993-05-01), Seino et al.
patent: 5388170 (1995-02-01), Heismann et al.
DC Drift Phenomena in LiNbO.sub.3 Optical Waveguide Devices, Yamada et al., Japanese Journal of Applied Physics, vol. 20, No. 4, Apr., 1981, pp. 733-737.
Hatori Masami
Sonoda Shinichiro
Yamada Takashi
Fuji Photo Film Co. , Ltd.
Ngo John
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