期刊
OPTICS EXPRESS
卷 20, 期 20, 页码 22819-22829出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.20.022819
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类别
资金
- Defense Advanced Research Projects Agency
- Institute for Quantum Information and Matter
- NSF
- Gordon and Betty Moore Foundation
- Kavli Nanoscience Institute at Caltech
Single-mode waveguide designs frequently support higher order transverse modes, usually as a consequence of process limitations such as lithography. In these systems, it is important to minimize coupling to higher-order modes so that the system nonetheless behaves single mode. We propose a variational approach to design adiabatic waveguide connections with minimal intermodal coupling. An application of this algorithm in designing the S-bend of a whispering-gallery spiral waveguide is demonstrated with approximately 0.05dB insertion loss. Compared to other approaches, our algorithm requires less fabrication resolution and is able to minimize the transition loss over a broadband spectrum. The method can be applied to a wide range of turns and connections and has the advantage of handling connections with arbitrary boundary conditions.
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