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Compact mode expanders using resonant coupling between a tapered active region and an underlying coupling waveguide

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5 Author(s)
V. Vusirikala ; Dept. of Electr. Eng., Maryland Univ., College Park, MD, USA ; S. S. Saini ; R. E. Bartolo ; M. Dagenais
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A novel technique for enhanced laser-fiber coupling, based on resonant power coupling between a tapered active waveguide and an underlying coupling waveguide, is presented. Spot-sizes are transformed from 2.0×1.1 μm in the active region to 6.0×3.1 μm in the coupling waveguide, over a length of 200 μm, with a mode transformation loss of only 0.36 dB. Butt-coupling efficiencies of 55% (2.6 dB loss) are estimated to standard cleaved single-mode fibers at 1.55 μm. The proposed device requires a single epitaxial growth and conventional processing techniques, making it amenable for low-cost manufacturing.

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IEEE Photonics Technology Letters  (Volume:10 ,  Issue: 2 )