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Semiconductor Intersectional Waveguide Optical Switch Using Positive Refractive Index Variation
Kazuhiko SHIMOMURA Shigehisa ARAI Yasuharu SUEMATSU
IEICE TRANSACTIONS on Electronics
Publication Date: 1991/02/25
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Full Text: PDF>>
We propose and analyze a new type of intersectional optical switch using positive refractive index variation in quantum well structure. The switch structure has a built-in refractive index difference in the waveguide, due to which the incident light is reflected to cross port at the OFF state. When the electric field applied to the electrode (ON state), the built-in refractive index difference vanishes by the positive refractive index variation in the quantum well, and the light transmits to straight port. Low insertion loss of lesser than 1 dB and high extinction ratio of more than 20 dB can be obtained at both cross and straight port.