Journal
IEEE PHOTONICS TECHNOLOGY LETTERS
Volume 18, Issue 1-4, Pages 13-15Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2005.860037
Keywords
finite-difference time-domain; silicon-on-insulator (SOI) waveguides; subwavelength grating; waveguide grating coupler
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A new diffractive device for light coupling between a planar optical waveguide and free space is proposed. The device utilizes a second-order waveguide grating to diffract the fundamental waveguide mode into two free propagating beams and a subwavelength grating (SWG) mirror to combine the two free propagating beams into a single beam. The finite-difference time-domain (FDTD) simulations show that the SWG mirror improves the coupling efficiency of the waveguide fundamental mode into the single out-coupled beam from about 30% to 92%. A high efficiency (> 90%) is predicted for a broad wavelength range of 1520-1580 nm. The proposed device is compact (similar to 80 mu m in length) and it eliminates the need for blazing the waveguide grating.
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