Semiconductor Intersectional Waveguide Optical Switch Using Positive Refractive Index Variation

Kazuhiko SHIMOMURA  Shigehisa ARAI  Yasuharu SUEMATSU  

IEICE TRANSACTIONS on Electronics   Vol.E74-C   No.2   pp.378-383
Publication Date: 1991/02/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Electro-Optics

Full Text: PDF>>
Buy this Article

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.