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Ideal Bend Contour Trajectories for Single-Mode Operation of Low-Loss Overmoded Waveguides

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6 Author(s)
Koos, C. ; Inst. of High-Frequency & Quantum Electron., Karlsruhe Univ. ; Poulton, C.G. ; Zimmermann, L. ; Jacome, L.
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Bend designs for single-mode operation of low-loss overmoded waveguides are presented. A class of contour trajectories for minimum radiation loss is derived analytically, and numerical optimization is used to find ideal trajectory parameters. Three-dimensional finite-difference time-domain simulations predict bend losses below 0.1 dB for 180deg-bends of overmoded silicon-on-insulator waveguides with a radius of R=1.5 mum. These findings are supported experimentally

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Photonics Technology Letters, IEEE  (Volume:19 ,  Issue: 11 )