Optical waveguides – With optical coupler – Particular coupling structure
Patent
1990-06-26
1991-09-17
Lee, John D.
Optical waveguides
With optical coupler
Particular coupling structure
385 16, 385 50, G02B 626
Patent
active
050489062
ABSTRACT:
A waveguide type photoswitch has a substrate on which a plurality of waveguide paths are provided in close proximity to each other. Electrodes are arranged along the waveguide paths in a coupling region of the paths. The distance between the waveguide paths is greater at the center of the coupling region than at opposite ends of the region, so that the coupling coefficient can be reduced at the central part of the coupling region and the coupling region itself can be shortened. The electrodes each is shorter than the coupling region to allow the operating voltage to be noticeably lowered and the operation speed to be increased.
REFERENCES:
patent: 4391486 (1983-07-01), Papuchon et al.
patent: 4674829 (1987-06-01), Bulmer et al.
patent: 4679893 (1987-07-01), Ramer
patent: 4871223 (1989-10-01), Auracher et al.
Bulmer et al, "Linear Interferometric Waveguide Modulator . . . ", Optics Letters, vol. 5, No. 5, May 1980, pp. 176-178.
McCaughan et al, "Three-Electrode Ti: LiNbO.sub.3 Optical Switch, Journal of Lightwave Technology", vol. LT-4, No. 9, Sep. 1986, pp. 1324-1327.
Nishihara et al, "Optical Integrated Circuit" 1st Ed., Ohm-Sha, Feb. 25, 1985, pp. 304-307.
Asabayashi Issei
Okayama Hideaki
Lee John D.
OKI Electric Industry Co., Ltd.
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