OSA's Digital Library

Journal of Lightwave Technology

Journal of Lightwave Technology


  • Vol. 25, Iss. 1 — Jan. 1, 2007
  • pp: 372–380

Optimization of Cladding-Structure-Modified Long-Period-Grating Refractive-Index Sensors

Jian Yang, Li Yang, Chang-Qing Xu, and Yingfu Li

Journal of Lightwave Technology, Vol. 25, Issue 1, pp. 372-380 (2007)

View Full Text Article

Acrobat PDF (819 KB)

Browse Journals / Lookup Meetings

Browse by Journal and Year


Lookup Conference Papers

Close Browse Journals / Lookup Meetings

Article Tools

  • Export Citation/Save Click for help


The cladding-modified long-period-grating (LPG) refractive-index sensors with a high-refractive-index overlay are optimized based on systematical studies on the structure-modified LPG. Dependence of the cladding-mode effective indexes on the parameters of the structure-modified LPG, such as the overlay refractive index (RI), the overlay thickness, the cladding-layer radius, and the ambient RI, as well as the order of cladding mode, are investigated in detail. An optimization procedure based on reducing the cladding radius, keeping the grating period as an adaptive parameter, and employing the HE13 mode notch-wavelength shift is proposed for the LPG RI sensors. By using the proposed optimization method, it is shown that an ambient RI sensitivity as large as 5980 nm/RI can be achieved, representing a threefold sensitivity enhancement, as compared to the best result obtained from the reported structure, in which the high HE17 mode resonate notch wavelength was employed in sensing.

© 2007 IEEE

Jian Yang, Li Yang, Chang-Qing Xu, and Yingfu Li, "Optimization of Cladding-Structure-Modified Long-Period-Grating Refractive-Index Sensors," J. Lightwave Technol. 25, 372-380 (2007)

Sort:  Year  |  Journal  |  Reset


  1. S. W. James, R. P. Tatam, "Optical fibre long-period grating sensors: Characteristic and application," Meas. Sci. Technol. 14, R49-R61 (2003).
  2. H. J. Patrick, A. D. Kersey, F. Bucholtz, "Analysis of the response of long period fiber grating to external index of refraction ," J. Lightw. Technol. 16, 1606-1612 (1998).
  3. N. D. Rees, S. W. James, R. P. Tatam, G. J. Ashwell, "Optical fiber long-period gratings with Langmuir–Blodgett thin-film overlays," Opt. Lett. 27, 686-688 (2002).
  4. I. Del Villar, I. R. Matías, F. J. Arregui, "Optimization of sensitivity in long period fiber gratings with overlay deposition," Opt. Express 13, 56-69 (2005).
  5. Z. Wang, J. R. Heflin, R. H. Stolen, S. Ramachandran, "Analysis of optical response of long period fiber gratings to nm-thick thin-film coating ," Opt. Express 13, 2808-2813 (2005).
  6. A. Cusano, A. Iadicicco, P. Pilla, L. Contessa, S. Campopiano, A. Cutolo, "Cladding mode reorganization in high-refractive index-coated long-period gratings: Effects on the refractive-index sensitivity," Opt. Lett. 30, 2536-2538 (2005).
  7. J. Yang, L. Yang, C.-Q. Xu, C. Xu, W. Huang, Y. Li, "Long-period grating refractive index sensor with a modified cladding structure for large operational range and high sensitivity," Appl. Opt. 45, 6142-6147 (2006).
  8. T. Erdogan, "Cladding-mode resonances in short- and long-period fiber gratings filters," J. Opt. Soc. Amer. A, Opt. Image Sci. 14, 1760-1773 (1997).
  9. T. Erdogan, "Cladding-mode resonances in short- and long-period fiber grating filters: Errata," J. Opt. Soc. Amer. A, Opt. Image Sci. 17, 2113 (2000).
  10. P. Yeh, A. Yarive, E. Marom, "Theory of bragg fiber," J. Opt. Soc. Amer. 68, 1196-1201 (1978).
  11. I. Del Villar, I. R. Matias, F. J. Arregui, "Long-period fiber gratings with overlay of variable refractive index," IEEE Photon. Technol. Lett. 17, 1893-1895 (2005).
  12. J. W. Fleming, "Dispersion in Geo2-Sio2 glasses," Appl. Opt. 23, 4486-4493 (1984).
  13. S. Ramachandran, Z. Wang, M. Yan, "Bandwidth control of long-period grating-based mode converter in few mode fibers," Opt. Lett. 27, 698-670 (2002).

Cited By

OSA is able to provide readers links to articles that cite this paper by participating in CrossRef's Cited-By Linking service. CrossRef includes content from more than 3000 publishers and societies. In addition to listing OSA journal articles that cite this paper, citing articles from other participating publishers will also be listed.

« Previous Article  |  Next Article »

OSA is a member of CrossRef.

CrossCheck Deposited