Theoretical and experimental analysis of excessively tilted fiber gratings

Zhijun Yan, Hushan Wang, Changle Wang, Zhongyuan Sun, Guolu Yin, Kaiming Zhou, Yishan Wang, Wei Zhao, Lin Zhang

Research output: Contribution to journalArticlepeer-review


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 TM0m and TE0m 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.

Original languageEnglish
Pages (from-to)12107-12115
Number of pages9
JournalOptics Express
Issue number11
Early online date25 May 2016
Publication statusPublished - 30 May 2016

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