Title :
Polarization-independent switching operation in directional coupler using tensile-strained multi-quantum well
Author :
Aizawa, Takuya ; Nagasawa, Yutaka ; Ravikumar, K.G. ; Watanabe, Tsutomu
Author_Institution :
Optical Device Section, Fujikura Ltd., Chiba, Japan
Abstract :
Polarization-independent switching operation in a multi-quantum well directional coupler is obtained for the first time, with a bar-state crosstalk of -12 dB. By introducing tensile strain in an InGaAs-InP multi-quantum well, polarization-independent switching voltage is as small as 3 V, with the coupling length being 1.2 mm. The cross-state crosstalk that is obtained at zero-applied voltage, is less than -8 dB with respect to TE and TM polarized lights.<>
Keywords :
III-V semiconductors; electro-optical modulation; electro-optical switches; gallium arsenide; indium compounds; light polarisation; optical crosstalk; optical directional couplers; semiconductor quantum wells; 1.2 mm; 3 V; InGaAs-InP; InGaAs-InP multi-quantum well; TE polarized lights; TM polarized lights; bar-state crosstalk; coupling length; cross-state crosstalk; directional coupler; multi-quantum well directional coupler; polarization-independent switching operation; polarization-independent switching voltage; tensile strain; tensile-strained multi-quantum well; zero-applied voltage; Communication switching; Contacts; Directional couplers; Optical fiber polarization; Optical polarization; Optical waveguides; Quantum well devices; Switches; Tellurium; Voltage;
Journal_Title :
Photonics Technology Letters, IEEE
