Coupling and decoupling of dual-core photonic bandgap fibers.
Coupling characteristics of dual-core photonic bandgap fibers with triangular photonic crystal cladding are investigated by use of a vector plane-wave expansion method and a vector finite-element method. We demonstrate the eigenmodes and the coupling length for two orthogonal polarizations. A decoupling phenomenon is found at a certain wavelength in this fiber configuration. The decoupling effect is attributed to the effect of surface modes on the eigenmodes. The decoupling wavelength decreases as the ratio of core radius to cladding air-hole pitch increases from 1.05 to 1.15.
Wang
Zhi
Z
Institute of Modern Optics, Nankai University, Tianjin 300071, China. wangzhi@mail.nankai.edu.cn
Kai
Guiyun
G
Liu
Yange
Y
Liu
Jianfei
J
Zhang
Chunshu
C
Sun
Tingting
T
Wang
Chao
C
Zhang
Weigang
W
Yuan
Shuzhong
S
Dong
Xiaoyi
X