Wide band and low driving voltage optical modulator with an impr

Details Wide band and low driving voltage optical modulator with an impr Wide band and low driving voltage optical modulator with an impr

1997-05-12

2000-02-01

Palmer, Phan T. H.

Optical waveguides

Temporal optical modulation within an optical waveguide

Electro-optic

385 14, 385 2, 385 40, 385131, G02F 1035

Patent

active

060212322

ABSTRACT:
An optical modulator has a dielectric buffer layer extending over an optical waveguide and extending under an electrode which applies an electric field through the dielectric buffer layer to the optical waveguide for causing the optical waveguide to vary in refractive index profile in linear-proportion to an intensity of the electric field thereby causing a phase shift of a light which is on propagation in the optical waveguide, wherein the dielectric buffer layer varies in thickness whereby an overlap integral of a profile of the electric field and an optical mode field profile at a thinner portion of the dielectric buffer layer is larger than that at a thicker portion of the dielectric buffer layer, and whereby a difference of an effective microwave refractive index from an optical refractive index at the thicker portion is smaller than that at the thinner portion.

REFERENCES:
patent: 5764822 (1998-06-01), Madabhushi
M. Rangaraj et al., "A Wide-Band Ti:LiNbO.sub.3 Optical Modulator with a Conventional Coplanar Waveguide Type Electrode", pp. 1020-1022, IEEE Photonics Technology Letters, vol. 4, No. 9, Sep. 1992.
G.K. Gopalakrishnan et al., "40 GHz Low Half-Wave Voltage Ti:LiNbO.sub.3 Intensity Modulator", pp. 826-827, Electronics Letters, vol. 28, No. 9, Apr. 23, 1992.

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