| Literature DB >> 27410131 |
Zhijun Yan, Hushan Wang, Changle Wang, Zhongyuan Sun, Guolu Yin, Kaiming Zhou, Yishan Wang, Wei Zhao, Lin Zhang.
Abstract
We have theoretically and experimentally investigated the dual-peak feature of tilted fiber gratings with excessively tilted structure (named as Ex-TFGs). We have explained the dual-peak feature by solving eigenvalue equations for TM<sub>0m</sub> and TE<sub>0m</sub> of a circular waveguide, in which the TE (transverse electric) and TM (transverse magnetic) core modes are coupled into TE and TM cladding modes, respectively. Meanwhile, in the experiment, we have verified that one of the dual peaks at the shorter wavelength is due to the TM mode coupling whereas the other one at the longer wavelength arises from TE mode coupling when a linearly polarized light launched into the Ex-TFG. We have also investigated the peak separation of TE and TM cladding mode for different surrounding medium refractive indexes (SRI), revealed that the dual peaks separation is decreasing as increasing of SRI, which agrees very well with the theoretical analysis results.Entities:
Year: 2016 PMID： 27410131 DOI： 10.1364/OE.24.012107
Source DB: PubMed Journal: Opt Express ISSN： 1094-4087 Impact factor: 3.894