Optical waveguide device having substrate made of ferroelectric

Details Optical waveguide device having substrate made of ferroelectric Optical waveguide device having substrate made of ferroelectric

1994-08-24

1997-04-15

Lee, John D.

Optical waveguides

Planar optical waveguide

385130, 385 9, G02B 610

Patent

active

056218397

ABSTRACT:
In order not to vary a light dividing ratio, a light insertion loss and a light extinction ratio, even if an environmental temperature is varied, in a first aspect, an optical waveguide device has at least one optical waveguide substrate made of ferroelectric crystals, an optical waveguide formed in the optical waveguide substrate, a first crystal plane formed in the optical waveguide substrate in which charges of one polarity are generated due to pyroelectrical effects, a second crystal plane made of ferroelectrical crystals in which charges of the other polarity are generated, a first conductive layer formed on the first crystal plane, and a second conductive layer formed on the second crystal plane, wherein the first conductive layer is connected electrically to the first conductive layer.

REFERENCES:
patent: 5185823 (1993-02-01), Kaku et al.
patent: 5359449 (1994-10-01), Nishimoto et al.
Patent Abstracts of Japan, vol. 010, No. 135 (P-457) May 20, 1986 & JP-A-60 257325 (Yokokawa Hokushin Denki KK) Dec. 19, 1985.
Patent Abstracts of Japan, vol. 016, No. 345 (P-1392) Jul. 27, 1992 & JP-A-04 104221 (Japan Aviation Electron Ind Ltd) Apr. 6, 1992.
Patent Abstracts of Japan, vol. 015, No. 011 (P-1150) Jan. 10, 1991 & JP-A-02 257108 (NEC Corp.) Oct. 17, 1990.
C. H. Bulmer et al., Appl. Phys. Lett. 48 (16) 21 Apr. 1986, pp. 1036-1038 "Pyroelectric effects in LiNbO.sub.3 channel-waveguide devices".
G. E. Betts et al., SPIE vol. 1794, Integrated Optical Circuits II (1982), pp. 376-381 "Optical Modulators for Analog Link Applications".
A. S. Greenblatt et al., PSAA--III Technical Program, The Third Annual DARPA Symposium on Photonics Systems for Antenna Applications, Jan. 20, 21, and 22, 1993, "Temperature Stability of Packaged Linear Modulators in LiNbO.sub.3 ".

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