Optical modulation element

Details Optical modulation element Optical modulation element

1989-07-28

1990-08-07

Lee, John D.

350 9614, G02F 129

Patent

active

049462431

ABSTRACT:
An optical modulation element is disclosed which has, on a substrate directly or through a lower clad layer, an optical waveguide layer of a low impurity concentration, an upper clad layer of a refractive index smaller than that of the optical waveguide layer, and electrodes, and in which light of a constant intensity incident on a light incident end face of the optical waveguide layer is intensity-modulated by changing the absorption coefficient of the optical waveguide layer by means of an electric field applied thereto across the electrodes so that the thus modulated light is emitted from a light emitting end face of the optical waveguide layer. In accordance with the present invention, a plurality of low impurity concentration regions and a plurality of high impurity concentration regions are disposed alternately with each other in contact with at least one of the lower and upper clad layers in the direction of travel of light in such a manner that the distribution density of the plurality of high impurity concentration regions increases in the direction of travel of light.

REFERENCES:
patent: 4772854 (1988-09-01), Silberberg

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