Study of coupling length of concentrically curved waveguides

Dong Po Cai; Chii Chang Chen; Chien Chieh Lee; Tsong Dong Wang

doi:10.1109/JPHOT.2011.2178063

Study of coupling length of concentrically curved waveguides

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

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

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.

Original language	English
Article number	6094151
Pages (from-to)	80-85
Number of pages	6
Journal	IEEE Photonics Journal
Volume	4
Issue number	1
DOIs	https://doi.org/10.1109/JPHOT.2011.2178063
State	Published - 2012

Keywords

Concentrically curved waveguides
conformal transformation
coupling coefficient
coupling length

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10.1109/JPHOT.2011.2178063

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abstract = "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.",

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AU - Cai, Dong Po

AU - Chen, Chii Chang

AU - Lee, Chien Chieh

AU - Wang, Tsong Dong

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N2 - 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.

AB - 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.

KW - Concentrically curved waveguides

KW - conformal transformation

KW - coupling coefficient

KW - coupling length

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Study of coupling length of concentrically curved waveguides

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Keywords

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