Open AccessEfficient coupling from dielectric rib waveguide to two-dimensional photonic crystal waveguide
Author(s) -
Ningfeng Bai,
Liang Xu,
Jinbiao Xiao,
Mingde Zhang,
Xiaohan Sun
Publication year - 2005
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.54.4933
Subject(s) - planar , waveguide , coupling (piping) , materials science , finite difference time domain method , optics , photonic crystal , dielectric , adiabatic process , optoelectronics , physics , computer graphics (images) , computer science , metallurgy , thermodynamics
An efficient adiabatic coupling is presented in this paper for coupling light between rib dielectric waveguide and 2D photonic crystal waveguide (PCW). Using planar wave expand (PWE) method and FDTD method, the linear and nonlinear taper profiles are compared. Following with these, some widths of the entrance of the taper are compared and the best width is given. Simulation result have proved that transmission ratio above 95% can be obtained in a wider frequency range by usin g a cosine taper profile than line taper profile.