Title :
Compact Focusing Grating Couplers for Silicon-on-Insulator Integrated Circuits
Author :
Van Laere, Frederik ; Claes, Tom ; Schrauwen, Jonathan ; Scheerlinck, Stijn ; Bogaerts, Wim ; Taillaert, Dirk ; Faolain, Liam O. ; Van Thourhout, Dries ; Baets, Roel
Author_Institution :
Ghent Univ.-IMEC, Ghent
Abstract :
We report experimental results on compact and broadband focusing grating couplers, both in silicon-on-insulator (SOI) and gold on SOI. An eight-fold length reduction of the coupling structure from fiber to photonic wire in SOI, as compared to a linear grating and adiabatic taper, is obtained, without performance penalty. A proof of principle is given for a focusing grating coupler in gold on SOI, with 20% fiber-to-focus efficiency.
Keywords :
diffraction gratings; integrated circuits; integrated optics; integrated optoelectronics; optical fibre couplers; silicon-on-insulator; broadband focusing grating couplers; compact focusing grating couplers; fiber-to-focus efficiency; silicon-on-insulator integrated circuits; Fiber gratings; Gold; Optical coupling; Optical fiber couplers; Optical fibers; Optical waveguides; Photonic integrated circuits; Silicon on insulator technology; Waveguide transitions; Wire; Focusing grating coupler; gold; integrated optics; metal; nanophotonic waveguides; silicon-on-insulator (SOI);
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2007.908762
