IEEE Photonics Journal (Jan 2012)

Study of Coupling Length of Concentrically Curved Waveguides

  • Dong-Po Cai,
  • Chii-Chang Chen,
  • Chien-Chieh Lee,
  • Tsong-Dong Wang

DOI
https://doi.org/10.1109/JPHOT.2011.2178063
Journal volume & issue
Vol. 4, no. 1
pp. 80 – 85

Abstract

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In this paper, we propose a method based on Helmholtz equation to determine the coupling length of the light propagating in concentrically curved waveguides by the conformal transformation. After the transformation, the concentrically curved waveguides are regarded as straight directional couplers, and the coupling length can be obtained rapidly by using this method. We also calculate the coupling length by the finite-difference time-domain (FDTD) method to compare with the result obtained by our method. The results show a good agreement between the coupling length obtained by the conformal transformation and the FDTD method.

Keywords