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A broad-band waveguide grating coupler with a subwavelength grating mirror

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6 Author(s)
Cheben, P. ; Inst. for Microstruct. Sci., Nat. Res. Council of Canada, Ottawa, Ont., Canada ; Janz, S. ; Dan-Xia Xu ; Lamontagne, B.
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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 1520-1580nm. The proposed device is compact (∼80 μm in length) and it eliminates the need for blazing the waveguide grating.

Published in:

Photonics Technology Letters, IEEE  (Volume:18 ,  Issue: 1 )