Title :
A guided-mode-selective focusing grating coupler
Author :
Kintaka, K. ; Nishii, Junji ; Imaoka, Y. ; Ohmori, J. ; Ura, S. ; Satoh, R. ; Nishihara, H.
Author_Institution :
Photonics Res. Inst., Osaka, Japan
Abstract :
Guided-mode-selective focusing grating coupler, which couples out not TE0 mode but TE1 mode to a free space wave, was designed at around 850-nm wavelength for constructing a wavelength-division-multiplexing chip-to-chip optical interconnection board. The coupler was fabricated in a slab waveguide consisting of a Ge-SiO2 main-guiding core, a SiO2 subguiding core, a Si-N grating layer, and a high-reflection layer. Coupling efficiencies for TE0 and TE1 modes were obtained to be 5% and 46%, respectively, with 0.1-mm interaction length. The focus spot size of 3×1 μm was obtained for TE1 mode.
Keywords :
diffraction gratings; germanium; integrated optics; integrated optoelectronics; optical communication equipment; optical couplers; optical design techniques; optical fabrication; optical interconnections; optical waveguides; silicon; silicon compounds; wavelength division multiplexing; 0.1 mm; 0.1-mm interaction length; 46 percent; 5 percent; 850 nm; Ge-SiO/sub 2/; Ge-SiO/sub 2/ main-guiding core; Si-N; Si-N grating layer; SiO/sub 2/ subguiding core; TE/sub 0/ modes; TE/sub 1/ mode; coupling efficiency; focus spot size; free space wave; grating couplers; guided-mode-selective focusing grating coupler; high-reflection layer; slab waveguide; wavelength-division-multiplexing chip-to-chip optical interconnection board; Gratings; Integrated optics; Optical coupling; Optical interconnections; Optical sensors; Optical waveguides; Refractive index; Surface emitting lasers; Tellurium; Vertical cavity surface emitting lasers;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2003.821118
