Title :
Grating-assisted directional coupler filters using AlGaAs/GaAs MQW waveguides
Author :
Sakata, Hajime ; Takeuchi, Shinsuke
Author_Institution :
Canon Res. Center, Kanagawa, Japan
Abstract :
Wavelength demultiplexing in the 800 nm region is demonstrated using grating-assisted vertical codirectional coupler filters formed in two AlGaAs/GaAs multiple quantum well (MQW) ridge waveguides. A filter bandwidth as narrow as 3 nm (full width at half maximum) and interwaveguide coupling efficiency of 95% with a coupling length of only 430 mu m were achieved. Channel spacing of 4 nm was obtained for five-channel wavelength demultiplexing with crosstalk suppression in excess of 10 dB.<>
Keywords :
III-V semiconductors; aluminium compounds; band-pass filters; diffraction gratings; directional couplers; frequency division multiplexing; gallium arsenide; multiplexing; optical couplers; optical filters; semiconductor quantum wells; 800 nm; 95 percent; AlGaAs-GaAs; AlGaAs/GaAs MQW waveguides; III-V semiconductor; WDM; bandpass filters; channel spacing; coupling length; crosstalk suppression; directional coupler; filter bandwidth; five-channel; grating-assisted vertical codirectional coupler filters; interwaveguide coupling efficiency; photonic circuits; ridge waveguides; wavelength demultiplexing; Band pass filters; Crosstalk; Demultiplexing; Diffraction gratings; Directional couplers; Gallium arsenide; Optical filters; Optical noise; Optical waveguides; Quantum well devices;
Journal_Title :
Photonics Technology Letters, IEEE
