Numerical and experimental analysis of long period gratings in wavelength scale elliptical microfibers

We report the fabrication of long-period gratings （LPGs） in elliptical microfibers with femtosecond laser. Based on the numerical analysis of the modes and the mode coupling condition of elliptical microfibers, an LPG is fabricated with a very short pitch of 10 μm by periodically modifying the fiber...

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Bibliographic Details
Published inChinese physics B Vol. 26; no. 10; pp. 147 - 151
Main Author 金娃 毕卫红 付广伟
Format Journal Article
LanguageEnglish
Published 01.10.2017
Subjects
实验
微纤
数值分析
椭圆
波长
液化石油气
温度灵敏度
长周期光纤光栅
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ISSN1674-1056
2058-3834
DOI10.1088/1674-1056/26/10/100702

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Summary:We report the fabrication of long-period gratings （LPGs） in elliptical microfibers with femtosecond laser. Based on the numerical analysis of the modes and the mode coupling condition of elliptical microfibers, an LPG is fabricated with a very short pitch of 10 μm by periodically modifying the fiber surface, which demonstrates very strong polarization-dependent resonances, a very low temperature sensitivity of a few picometers in air, and high temperature sensitivity of -1.62 nm/℃ in refractive index oil.
Bibliography:elliptical microfiber, long period grating, femtosecond laser, temperature sensitivity
We report the fabrication of long-period gratings （LPGs） in elliptical microfibers with femtosecond laser. Based on the numerical analysis of the modes and the mode coupling condition of elliptical microfibers, an LPG is fabricated with a very short pitch of 10 μm by periodically modifying the fiber surface, which demonstrates very strong polarization-dependent resonances, a very low temperature sensitivity of a few picometers in air, and high temperature sensitivity of -1.62 nm/℃ in refractive index oil.
Wa Jin1,2, Wei-Hong Bi1,2, Guang-Wei Fu1,2（ 1Department of Optoelectronic Engineering, Yanshan University, Qinhuangdao 066004, China; 2 The Key Laboratory for Special Fiber and Fiber Sensor of Hebei Province, Qinhuangdao 066004, China）
11-5639/O4
ISSN:1674-1056
2058-3834
DOI:10.1088/1674-1056/26/10/100702