Title :
Cladding layer thickness-controlled directional coupler optical switch
Author :
Ushikubo, Takashi ; Asabayashi, Issei ; Hashimoto, Akihiro ; Ishida, Toshimasa
Author_Institution :
Oki Elect. Ind. Co. Ltd., Tokyo, Japan
fDate :
2/1/1990 12:00:00 AM
Abstract :
The AlGaAs/GaAs cladding layer thickness-controlled directional coupler optical switch (CTC-SW) is discussed. To increase the efficiency of coupling between two waveguides, the CTC-SW was designed with a thin i-AlGaAs cladding layer h between the two waveguides. The coupling length Lc can be reduced, without reduction of the extinction ratio and increase of the switching voltage. For instance, Lc of CTC-SW (h=0.07) can be reduced 40% more than that of a conventional directional coupler switch (h=0). The extinction ratio is near 20 dB, both for the crossover (applied voltage V=0 V) and straight-through (V =19 V) states. A technique for adjusting Lc to the device length was developed
Keywords :
III-V semiconductors; aluminium compounds; directional couplers; gallium arsenide; optical couplers; optical switches; 20 dB; AlGaAs-GaAs; III-V semiconductors; cladding layer thickness-controlled directional coupler optical switch; coupling length; extinction ratio; Directional couplers; Extinction ratio; Gallium arsenide; Indium phosphide; Optical coupling; Optical refraction; Optical switches; Optical variables control; Optical waveguides; Stripline;
Journal_Title :
Lightwave Technology, Journal of
