Title :
Optical waveguide fan-out elements using dislocated gratings for both outcoupling and phase shifting
Author :
Li, Ming ; Hagberg, Mats ; Bengtsson, Jörgen ; Eriksson, Niklas ; Larsson, Anders
Author_Institution :
Dept. of Optoelectron. & Electr. Meas., Chalmers Univ. of Technol., Goteborg, Sweden
Abstract :
A novel scheme is proposed and experimentally demonstrated for the construction of an optical waveguide fan-out element. The device is composed of an array of rectangular elements, each containing a dislocated grating, on an optical waveguide. The functions of the gratings are twofold: outcoupling the guided wave and introducing phase shifts. Such a waveguide fan-out device has been fabricated on an AlGaAs-GaAs waveguide. The uniformity error and the diffraction efficiency were measured to be /spl sim/11% and /spl sim/60%, respectively.
Keywords :
III-V semiconductors; aluminium compounds; diffraction gratings; errors; gallium arsenide; measurement errors; optical couplers; optical design techniques; optical focusing; optical waveguide components; optical waveguide theory; optical waveguides; phase shifters; AlGaAs-GaAs; AlGaAs-GaAs waveguide; diffraction efficiency; dislocated gratings; guided wave outcoupling; optical waveguide fan-out elements; outcoupling; phase shifting; phase shifts; rectangular elements; uniformity error; Arrayed waveguide gratings; Electrooptical waveguides; Microwave technology; Optical arrays; Optical devices; Optical waveguides; Phased arrays; Planar waveguides; Rectangular waveguides; Space technology;
Journal_Title :
Photonics Technology Letters, IEEE
