Optical modulation device

Details Optical modulation device Optical modulation device

1989-02-16

1990-04-03

Sikes, William L.

350 9612, G02B 610

Patent

active

049135066

ABSTRACT:
An optical modulation device is disclosed in which a difference between the photon energy of incident light and the band-gap energy of the modulation waveguide layer is set to a value greater than 50 meV to thereby suppress the degradation of the modulation voltage and the modulation band width which is caused by an increase in the intensity of incident light and in that the optical modulation device is formed in a predetermined length to thereby decrease the modulation voltage. The energy gap of the optical waveguide layer of the optical modulation device is varied continuously or discontinuously in the direction of its thickness to provide a constant absorption coefficient thickwise of the optical waveguide layer so that the electric field intensity distribution in the optical waveguide layer is compensated for, by which overlap of the light distribution and the absorption coefficient is increased so as to decrease the modulation voltage and broaden the modulation band by the reduction of the length of the device. The composition, thickness and stripe width of the optical waveguide layer are changed so that its absorption coefficient increases from the light receiving end face of the optical waveguide layer toward its light emitting end face, thereby making the number of carriers absorbed per unit length substantially constant in the direction of travel of light.

REFERENCES:
patent: 3695745 (1972-10-01), Furukawa
patent: 3868589 (1975-02-01), Wang
patent: 3923374 (1975-12-01), Martin
patent: 4685763 (1987-08-01), Tada et al.
patent: 4767169 (1988-08-01), Teng et al.
patent: 4837526 (1989-06-01), Suzuki et al.

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