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Citation Information : International Journal on Smart Sensing and Intelligent Systems. Volume 1, Issue 2, Pages 354-369, DOI: https://doi.org/10.21307/ijssis-2017-294
License : (CC BY-NC-ND 4.0)
Published Online: 13-December-2017
In this work, a comparative study aimed to investigate the effects of cladding stripping on the external refractive index sensitivity in tapered and UV long period gratings is presented. Here, wet chemical etching combined with microscopic analysis allow us to identify the experimental dependence of the surrounding refractive index (SRI) sensitivity on the cladding radius for both grating types. The experimental results reveal that although in both cases a sensitivity enhancement is achieved by reducing the cladding thickness, the tapered devices offer substantially a greater sensitivity gain in respect to UV written devices.
 V.Bhatia, “Applications of long-period gratings to single and multi-parameter sensing”, Opt. Express Vol. 4, 457–66, 1999.
 C. Y. Lin, L. A. Wang, and G. W. Chern, “Corrugated Long Period Fiber Gratings as Strain, Torsion, and Bending Sensors,” J. Lightwave Technol. 19, 1159-1168, 2001.
 A. Cusano, P. Pilla, L. Contessa, A. Iadicicco, S. Campopiano, A. Cutolo, M.Giordano, “High Sensitivity Optical Chemo-Sensor Based on Coated Long Period Gratings for Sub ppm Chemical Detection in Water”, Applied Physic Letters, Vol.
87, 234105, 2005.
 S.W James and R.P.Tatam, “Optical fiber long period grating sensors: characteristics and application”, Meas. Sci. Technol. vol. 14, pp. R49-R61, 2003.
 T. Allsop, D.J. Webb and I. Bennion, “A comparison of the sensing characteristics of long period gratings written in three different types of fiber,” Optical Fiber Technology, Vol. 9, 210–223, 2003.
 B.A.L. Gwandu, X. Shu, T.D.P. Allsop, W. Zhang, L. Zhang, I. Bennion, “Simultaneous refractive index and temperature measurement using cascaded longperiod grating in double-cladding fibre”, Electron Letters, vol. 38, 14, 2002.
 A. Cusano, A. Iadicicco, P. Pilla, L. Contessa, S. Campopiano, “Mode transition in high refractive index coated long period gratings”, Opt. Express vol. 14, 19-34, 2006.
 S. A. Vasiliev, E. M. Dianov, D. Varelas, H. G. Limberger, R. P. Salathé,“Postfabrication resonance peak positioning of long-period cladding-mode-coupled gratings”, Optics Letters vol. 21, 1830-1832, 1996.
 Y. Jeong, S. Kim, J. Kwon, N. Park, B. Lee, “Control of the characteristics of a longperiod grating by cladding etching”, Applied Optics, Vol. 39, No. 13, pp. 2038-2042,2000.
 K. Zhou, H. Liu, and X. Hu, “Tuning the resonant wavelength of long period fiber gratings by etching the fiber’s cladding,” Optics Communications, Vol. 197, pp. 295–299, 2001.
 K. Chiang, Y. Liu, M. Ng, and X. Dong, “Analysis of etched long-period fiber grating and its response to external refractive index”, Electron Letter vol. 36, 966–967, 2000.
 A. Iadicicco, S. Campopiano, M. Giordano, A. Cusano, “Spectral behavior in thinned long period gratings: effects of fiber diameter on refractive index sensitivity”,Applied Optics, Vol. 46, No. 28, pp. 6945-6952, 2007.
 X. Chen, K. Zhou, L. Zhang, I. Bennion, “Optical Chemosensors Utilizing Long-Period Fiber Gratings UV-Inscribed in D-Fiber With Enhanced Sensitivity Through Cladding Etching”, IEEE Photonics Technology Letters vol. 16, 1352-4, 2004.
 Y. J. Rao, Y. P. Wang, Z. L. Ran, T. Zhu, “Novel Fiber-Optic Sensors Based on Long-Period Fiber Gratings Written by High-Frequency CO2 Laser Pulses”, Journal Of Lightwave Technology, vol. 21, 1320-1327, 2003.
 G. Rego, O.Okhotnikov, E.Dianov, V.Sulimov, T. Zhu, “High-temperature stability of long period fiber gratings produced using an electric arc”, Journal Lightwave Technology vol. 19 (10), 1574-1579, 2001.
 K. Morishita and Y. Miyake, “Fabrication and Resonance Wavelengths of Long Period Gratings Written in a Pure-Silica Photonic Crystal Fiber by the Glass Structure Change”, Journal Lightwave Technology, vol. 22, 625 , 2004.
 X. Shu, L. Zhang, I. Bennion, “Sensitivity characteristics of long period fiber gratings”, Journal of Lightwave Technology Vol. 20, No. 2, 2002.
 E. Anemogiannis, E.N. Glytsis, T.K. Gaylord, “Transmission characteristics of longperiod fiber gratings having arbitrary azimuthal/radial refractive index variations”,Journal of Lightwave Technology, Vol. 21, No 1, pp 218-227, 2003.
 W. J. Bock, J. Chen, P. Mikulic, T. Eftimov, “A Novel Fiber-Optic Tapered Long Period Bragg Grating Sensor for Pressure Monitoring”, IEEE Instrumentation and Measurement Technol. Conference, Sorrento, Italy, 24-26 April 2006.
 G. Rego, O. V. Ivanov, P.V.S. Marques, “Demonstration of coupling to symmetric and antisymmetric cladding modes in arc-induced long-period fiber gratings”, Optics Express vol. 14, 9594-9599, 2006.
 A. Iadicicco, A. Cusano, A. Cutolo, R. Bernini, M. Giordano, “Thinned Fiber Bragg Gratings as High Sensitivity Refractive Index Sensor”, IEEE Photonics Technology Letters, Vol. 16, No. 4, 1149-1151, April 2004.