LIANG Hui, ZENG Qing-ke, QIN Zi-xiong, OU Qi-biao, TAN Zu-yin, LIU Zong-sheng. ASensitivity of long period fiber grating to refractive index[J]. Journal of Applied Optics, 2011, 32(1): 111-114.
Citation: LIANG Hui, ZENG Qing-ke, QIN Zi-xiong, OU Qi-biao, TAN Zu-yin, LIU Zong-sheng. ASensitivity of long period fiber grating to refractive index[J]. Journal of Applied Optics, 2011, 32(1): 111-114.
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ASensitivity of long period fiber grating to refractive index

  • 1.

    College of Electronic Engineering,Guangxi Normal University,Guilin 541004,China;

  • 2.

    College of Gannan Education,Ganzhou 341000,China

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  • The sensitivity of long-period grating in refractive index sensing was analyzed by using the coupled-mode theory, and the formula of resonance wavelength shifts of LPFGs which changes relative to the surrounding refractive index was derived. If the period of grating is not changed, when the cladding refractive index is less than and close to the surrounding refractive index, the results show that the resonant wavelength shifts increased. The resonant wavelength shifts are greater for higher order cladding modes and smaller fiber cladding radius and smaller cladding refractive index, namely, the sensitivity to the surrounding refractive index is obviously enhanced. When the surrounding refractive index is greater than the fiber cladding refractive index, the resonant wavelength of grating will remain unchanged.
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  • ［1］ERDOGAN T. Cladding-mode resonances in short and long period fiber grating filters［J］. Journal of the Optical Society of America A, 1997,14(8):1760-1773.［2］欧启标. 长周期光纤光栅的理论及其传感应用研究［D］.桂林:广西师范大学,2007:69-74.OU Qi-biao. The study of theoretical and application of sensor on long period fiber gratings［D］. Guilin: Guangxi Normal University,2007:69-74.(in Chinese)［3］丁金妃,付宏燕.包层腐蚀长周期光纤光栅对的光谱特性研究［J］.浙江大学学报(工学版), 2007,41(3):537-540.DING Jin-fei, FU Hong-yan. The study of spectral characteristics of corrosion cladding of the long period fiber grating［J］. Journal of Zhejiang University, 2007,41(3):537-540. (in Chinese with an English abstract)［4］SHU X W, BENNION L Z I. Sensitivity charac-teristics of long-period fiber grating［J］.Journal of the Lightwave Thechnology, 2002,20(2):255-266.［5］高霞.基于长周期光纤光栅的理论及应用研究［D］.济南:山东大学,2009:55-63.GAO Xia. Based on the theory of long period fiber grating and its application［D］.Jinan: Shandong University,2009:55-63. (in Chinese)［6］武刚.提高长周期光纤光栅折射率传感灵敏度方法的研究［D］.长春:吉林大学,2009:34-37.WU Gang. The study on improving the method of the sensitivity to refractive index of long-period fiber grating［D］. Changchun: Jilin University, 2009:34-37. (in Chinese)［7］丁金妃.光纤光栅折射率传感技术研究［D］.杭州:浙江大学,2006:48-58.DING Jin-fei. The research on the sensing technology of refractive index of fiber grating［D］.Hangzhou:Zhejiang University, 2006:48-58. (in Chinese)［8］ERDOGAN T. Fiber grating spectra［J］.Journal of Lightwave Technology, 1997,15(8):1277-1294.［9］徐俊娇,李杰,戎华北,等.少模光纤布拉格光栅折射率传感的分析与测量［J］.光学学报,2008,28(3):565-568.XU Junjiao, LI Jie, RONG Hua-bei, et al. Analysis and measurement on refractive index sensing of few mode fiber Bragg gratings［J］. Acta Optica Sinica,2008,28(3):565-568. (in Chinese with an English abstract)［10］MARCUSE D. Theory of dielectric optical wave-guides［M］.2nd edition. Boston: Academic Press,1991:31-43.
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