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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 20 — Sep. 24, 2012
  • pp: 22819–22829

A general design algorithm for low optical loss adiabatic connections in waveguides

Tong Chen, Hansuek Lee, Jiang Li, and Kerry J. Vahala  »View Author Affiliations

Optics Express, Vol. 20, Issue 20, pp. 22819-22829 (2012)

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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.

© 2012 OSA

OCIS Codes
(220.0220) Optical design and fabrication : Optical design and fabrication
(230.7370) Optical devices : Waveguides
(230.7390) Optical devices : Waveguides, planar

ToC Category:
Optical Design and Fabrication

Original Manuscript: July 3, 2012
Revised Manuscript: September 6, 2012
Manuscript Accepted: September 7, 2012
Published: September 20, 2012

Tong Chen, Hansuek Lee, Jiang Li, and Kerry J. Vahala, "A general design algorithm for low optical loss adiabatic connections in waveguides," Opt. Express 20, 22819-22829 (2012)

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