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  • Title: A general design algorithm for low optical loss adiabatic connections in waveguides.
    Author: Chen T, Lee H, Li J, Vahala KJ.
    Journal: Opt Express; 2012 Sep 24; 20(20):22819-29. PubMed ID: 23037432.
    Abstract:
    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 0.05 dB 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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