Light modulation device

Details Light modulation device Light modulation device

G - Physics

02

F

345/56

G02F 1/015 (2006.01) G02F 1/025 (2006.01) G02F 1/313 (2006.01)

Patent

CA 1212749

LIGHT MODULATION DEVICE Abstract of the Disclosure: A light modulation device according to the present invention comprises a substrate, a substrate layer, an optical waveguide layer, and buffer layers, in the order from the bottom upward, are all formed of either n-type or p-type compound semiconductor crystal. In this light modulation device, in order to capture the light in the optical waveguide layer, composition ratio of the compound semiconductor is so determined that refractive index is at least 0.1% higher in the optical waveguide layers than in the substrate layer and in the buffer layers. Further, the carrier density is low in the optical waveguide layer and in the buffer layers so that the applied voltage is applied mainly to the optical waveguide layer. Because of such construction, the light modulation device according to the present invention is free from strict conditions required in etching process, is small in absorption loss of light, and can be used as a component of monolithic optical integrated circuit.

450919

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