Abstract

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 HE<sub>13</sub> 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 HE<sub>17</sub> mode resonate notch wavelength was employed in sensing.

© 2007 IEEE

PDF Article

References

  • View by:
  • |
  • |

  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).

2006 (1)

2005 (4)

2003 (1)

S. W. James, R. P. Tatam, "Optical fibre long-period grating sensors: Characteristic and application," Meas. Sci. Technol. 14, R49-R61 (2003).

2002 (2)

2000 (1)

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).

1998 (1)

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).

1997 (1)

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).

1984 (1)

1978 (1)

P. Yeh, A. Yarive, E. Marom, "Theory of bragg fiber," J. Opt. Soc. Amer. 68, 1196-1201 (1978).

Appl. Opt. (2)

IEEE Photon. Technol. Lett. (1)

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).

J. Lightw. Technol. (1)

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).

J. Opt. Soc. Amer. (1)

P. Yeh, A. Yarive, E. Marom, "Theory of bragg fiber," J. Opt. Soc. Amer. 68, 1196-1201 (1978).

J. Opt. Soc. Amer. A, Opt. Image Sci. (2)

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).

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).

Meas. Sci. Technol. (1)

S. W. James, R. P. Tatam, "Optical fibre long-period grating sensors: Characteristic and application," Meas. Sci. Technol. 14, R49-R61 (2003).

Opt. Express (2)

Opt. Lett. (3)

Cited By

OSA participates in CrossRef's Cited-By Linking service. Citing articles from OSA journals and other participating publishers are listed here.