Study of Coupling Length of Concentrically Curved Waveguides

IEEE Photonics Journal

Dong-Po Cai¹  Tsong-Dong Wang¹  Chii-Chang Chen¹  Chien-Chieh Lee² 

[1] $^{1}$Department of Optics and Photonics, National Central University, Jhongli, Taiwan;$^{2}$Optical Sciences Center, National Central University, Jhongli, Taiwan;

关键词: Concentrically curved waveguides;    coupling length;    coupling coefficient;    conformal transformation;   

DOI  :  10.1109/JPHOT.2011.2178063

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown