Title :
High extinction guided-wave optical polarization splitter
Author :
Yanagawa, H. ; Mak, H. ; Kamata, Y. ; Ueki, K.
Author_Institution :
Furukawa Electr. Co. Ltd., Chiba, Japan
Abstract :
Conventional guided-wave optical polarization splitters exhibit poor polarization extinction characteristics because of the necessity of controlling waveguide parameters. In order to improve the characteristics, an electrical control scheme was investigated in an alternating Delta beta directional coupler. Polarization-dependent electrooptic as well as polarization-independent plasma effects were employed to produce high extinction for two orthogonal polarizations independently. As a result, an extinction ratio as high as 32 dB was obtained with a fabricated GaAs-GaAlAs device. This is the highest value ever reported with a channel waveguide device.<>
Keywords :
directional couplers; integrated optics; light polarisation; optical couplers; optical waveguides; GaAs-GaAlAs; channel waveguide device; directional coupler; electrical control scheme; guided-wave optical polarization splitter; orthogonal polarizations; polarisation-dependent electrooptic effects; polarization extinction characteristics; polarization-independent plasma effects; waveguide parameters; Directional couplers; Optical control; Optical polarization; Optical receivers; Optical refraction; Optical variables control; Optical waveguides; Propagation constant; Voltage control;
Journal_Title :
Photonics Technology Letters, IEEE
