Investigations on highly sensitive fiber Bragg gratings with different grating shapes for far field applications

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• 作者：Gurpreet Kaur^a ; ^{gksumman@gmail.com} ; R.S. Kaler^a ; Naveen Kwatra^b
• 关键词：Tilted fiber Bragg grating ; Superstructure fiber Bragg grating ; Uniform fiber Bragg grating
• 刊名：Optik - International Journal for Light and Electron Optics
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：131
• 期：Complete
• 页码：483-489
• 全文大小：1516 K
• 卷排序：131

文摘

The Fiber Brag Grating (FBG) optical sensor is investigated with uniform fiber grating (UFBG), superstructure fiber Bragg grating (SFBG) and tilted fiber Bragg grating (TFBG) using Finite Difference Time Domain (FDTD). The effect of variation in Refractive Index (RI) on the far field pattern of the guided light, reflection and the transmission power spectra of the gratings have been observed. TFBG reported the best performance exhibiting maximum peak amplitude of far field is 0.218 a. u., followed by UFBG is 0.0467 a. u. and SFBG is 0.0383 a. u. Further, the coupling efficiency of the gratings has been calculated from the mode overlap integral. The TFBG reported the highest value of 5.622%. SFBG followed it with 0.466% and UFBG with 0.012%. The SFBG reported the maximum value of reflected power i.e. 1.9456 dB which is 3 times to that of UFBG (0.6317 dB) and 5.67 times to that of TFBG (0.3433 dB).