Optical modulating/switching device

Details Optical modulating/switching device Optical modulating/switching device

1986-03-03

1989-04-04

Wan, Gene

350 9614, G02B 610

Patent

active

048180637

ABSTRACT:
An optical element comprising: a substrate; an optical waveguide arranged on the substrate; and flat electrodes disposed asymmetrically about the optical waveguide. An electric field is applied through the flat electrodes to the substrate and the optical waveguide so that a refractive index of a portion of the substrate in the vicinity of the optical waveguide is varied to interrupt a light beam propagating through the optical waveguide. The optical modulation, optical switching or the like can be carried out by electrically controlling the difference between refractive indices of the optical waveguide and the substrate in the horizontal direction, so that the nonuniformity of the refractive index of the optical waveguide which causes some problems in conventional branching interference type optical modulator and directional optical coupler do not cause any problem. The optical element has a higher light extinction ratio and the output light is by far stabilized against the variation in temperature.

REFERENCES:
patent: 4262993 (1981-04-01), Burns et al.
patent: 4291939 (1981-09-01), Giallovenzi et al.
R. G. Hunsperger, "Integrated Optics; Theory and Technology", Springer-Verlag, N.Y. 1982, p. 135.
H. Kogelink, "Integrated Optics: Theory of Dielectric Waveguides", Springer-Verlag, N.Y. 1975, p. 13.
J. S. Wilkinson, "Design and Performance of a Low Crosstalk Directional Coupler Switch", IEEE Proceedings, vol. 131, Pt.H., No. 5, Oct. 1984, pp. 304-308.
G. B. Hocker, "Strip-Loaded Diffused Optical Waveguides", IEEE Journal of Quantum Electronics, vol. QE-12, No. 4, Apr. 1976, pp. 232-236.
A. Neyer and W. Sohler, "High Speed Cutoff Modulator Using a Ti-Diffused LiNbO.sub.3 Channel Waveguide", Appl. Phys. Lett. (35)(3) 1 Aug. 1979, pp. 256-258.

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