Ideal Bend Contour Trajectories for Single-Mode Operation of Low-Loss Overmoded Waveguides |
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| Authors: | Koos C Poulton C G Zimmermann L Jacome L Leuthold J Freude W |
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| Affiliation: | Inst. of High-Frequency & Quantum Electron., Karlsruhe Univ.; |
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| Abstract: | 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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