Pn junction optical modulating device having a buffer layer with

Details Pn junction optical modulating device having a buffer layer with Pn junction optical modulating device having a buffer layer with

1989-11-27

1991-02-12

Ullah, Akm

Coherent light generators

Particular component circuitry

Optical pumping

350 9613, 372 45, 357 16, 330 43, G02B 610, H01S 300, H01S 319, H01L 2961

Patent

active

049919210

ABSTRACT:
An optical modulating device is disclosed which has, on a substrate directly or via a lower cladding layer, an optical waveguide layer, an upper cladding layer of a refractive index smaller than that of the optical waveguide layer and a pair of electrodes for applying an electric field across the substrate and the upper cladding layer and in which the absorption coefficient for incident light of a fixed intensity incident to the optical waveguide layer is varied by the electric field applied across the pair of electrodes to perform the modulation of the light and the modulated light is emitted from a light emitting end face of the optical waveguide layer. In accordance with the present invention, a pn junction is formed in the upper cladding layer and at least one buffer layer of an energy gap smaller than that of the upper cladding layer but larger than that of the optical waveguide layer is interposed between the upper cladding layer and the optical waveguide layer.

REFERENCES:
patent: 4743087 (1988-05-01), Utaka et al.
patent: 4807952 (1989-02-01), Jaeger et al.
patent: 4811353 (1989-03-01), Noda et al.
patent: 4837526 (1989-06-01), Suzuki et al.
patent: 4913506 (1990-04-01), Suzuki et al.

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