Title :
Low Loss Star Coupler Concept for AWGs in Rib Waveguide Technology
Author :
Schnarrenberger, Martin ; Zimmermann, Lars ; Mitze, Torsten ; Voigt, Karsten ; Bruns, Jürgen ; Petermann, Klaus
Author_Institution :
Tech. Univ. Berlin
Abstract :
We introduce a new concept for a tapered transition between waveguides and a free propagation region (FPR) for rib waveguide technology. The optical field is pressed downwards to the lower part of the guiding layer by tapering off the waveguide. The subsequent FPR is also etched down to the lower part of the guiding layer, which results in an adiabatic transition from the waveguide to the slab. Arrayed waveguide gratings, designed with this technique, were fabricated in silicon-on-insulator and showed a reduction in insertion loss of about 2.5 dB
Keywords :
arrayed waveguide gratings; integrated optics; optical couplers; optical design techniques; optical losses; rib waveguides; silicon-on-insulator; 2.5 dB; Si-SiO2; adiabatic transition; arrayed waveguide gratings; etching; free propagation region; insertion loss; low loss star coupler; optical field; rib waveguide technology; silicon-on-insulator; tapered transition; Arrayed waveguide gratings; Etching; Insertion loss; Optical losses; Optical propagation; Optical waveguide components; Optical waveguides; Silicon on insulator technology; Slabs; Waveguide transitions; Arrayed waveguide grating (AWG); low loss; rib waveguide; silicon-on-insulator (SOI) technology; star coupler;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2006.886849
