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《Journal of Transcluction Technology》 2002-01
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Long Period Fiber Grating Based Temperature Sensing Scheme with High Sensitivity

HE Wanxun, SHI Wenkang (Dept. of Information Detection Technology and Instrumentation, Shanghai Jiao Tong Univ. Shanghai 2000 P.R.China) YE Ailun (State Key Laboratory on Local Fiber Communication Networks and Advanced Optical Fiber Communication Syst  
LPFGs are band rejection fiber filters with wavelength dependent loss. Its resonance wavelengths shift towards the direction of longer wavelength with reduced cladding diameter. The shift for resonance wavelengths is produced with environmental temperature and external refractive index. According to this a temperature sensing scheme with enhanced sensitivity is proposed. The relation between resonance wavelengths of LPFG and environmental temperature is modeled. A LPFG is UV written in the core of a piece of fiber, whose diameter is beforehand corrosively reduced. Then the LPFG is recoated with polymer material. Sensing characteristics is measured for the device. The result of experiment is accordant with that of simulation. And its temperature sensitivity is more than 5.2 nm/℃.
【CateGory Index】: TP212.14
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1 HE Wan xun, SHI Wen kang, HE Shuo, FAN Xiao bo, YE Ai lun (Shanghai Jiao Tong University, Shanghai\ 200031, China);Long period fiber grating: theory, fabrication and application[J];Optical Technology;2001-05
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