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Study of High Efficiency Grating Couplers for Silicon-Based Horizontal Slot Waveguides

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4 Author(s)
J. V. Galan ; Valencia Nanophotonics Technol. Center, Univ. Politec. de Valencia, Valencia ; P. Sanchis ; J. Blasco ; J. Marti

Horizontal slot waveguides are becoming a very promising waveguide configuration for silicon photonics nonlinear applications. In this letter, the design of grating couplers for highly efficient coupling between standard single-mode fibers and horizontal slot waveguides is reported. Parameters have been optimized to achieve maximum coupling efficiency for lambda = 1550 nm and transverse magnetic polarization. Maximum coupling efficiencies of 61% and 48% have been achieved for negative and positive detuned grating couplers, respectively, by means of simulations. A 35-nm 1-dB bandwidth spectral response has also been obtained.

Published in:

IEEE Photonics Technology Letters  (Volume:20 ,  Issue: 12 )