[1] S. W. James and R. P. Tatam, “Optical fiber long period grating sensors: characteristics and applications,” Measurement Science and Technology, 2003, 14(5): 49–61.
[2] M. Vengsarkar, P. J. Lemaire, J. B. Judkins, V. Bhatia, T. Erdogan, and J. E. Sipe, “Long-period fiber gratings as band-rejection filters,” Journal of Lightwave Technology, 1996, 14(1): 58–65.
[3] V. Bhatia, “Applications of long-period gratings to single and multi-parameter sensing,” Optics Express, 1999, 4(11): 457–466.
[4] A. Singh, S. B. Rana, M. Singh, and A. Sharma, “Study and investigation of long period grating as refractive index sensor,” Optik – International Journal for Light and Electron Optics, 2014, 125(7): 1860–1863.
[5] Q. Huang, Y. Yu, Z. Ou, X. Chen, J. Wang, P. Yan, et al., “Refractive index and strain sensitivities of a long period fiber grating,” Photonic Sensors, 2014, 4(1): 92–96.
[6] K. R. Cooper, J. Elster, M. Jones, and R. G. Kelly, “Optical fiber-based corrosion sensor systems for health monitoring of aging aircraft,” in IEEE Systems Readiness Technology Conference, Valley Forge, pp. 847–856, 2001.
[7] J. A. Besley, T. Wang, and L. Reekie, “Fiber cladding mode sensitivity characterization for long-period gratings,” Journal of Lightwave Technology, 2003, 21(3): 848–853.
[8] A. Singh, D. Engles, A. Sharma, and M. Singh, “Temperature sensitivity of long period fiber grating in SMF-28 fiber,” Optik – International Journal for Light and Electron Optics, 2014, 125(1): 457–460.
[9] T. Erdogan, “Cladding-mode resonances in short- and long-period fiber grating filters,” Journal of the Optical Society of America A, 1997, 14(8): 1760–1773.
[10] W. V. Etten and J. V. D Plaats, Fundamentals of optical fiber communications. New York: Prentice Hall, 1991.
[11] J. A. Buck, Fundamentals of optical fibers. New York: John Wiley and Son Inc., 1995.
[12] K. W. Chung and S. Yin, “Analysis of a widely tunable long-period grating by use of an ultra thin cladding layer and higher-order cladding mode coupling,” Optics Letters, 2004, 29(8): 812–814.
[13] T. Erdogan, “Fiber grating spectra,” Journal of Lightwave Technology, 1997, 15(8): 1277–1294.
[14] Y. Yang and Z. Gu, “Comparing and analysis of calculation methods of long period fiber gratings transmission spectra,” Optik – International Journal for Light and Electron Optics, 2013, 124(15): 2234–2240.
[15] A. van Brakel, “Sensing characteristics of an optical fibre long-period grating Michelson refractometer,” DIng. Thesis, Rand Afrikaans University, 2004.