Abstract

A new method to control the free spectral range (FSR) of a long-period fiber grating (LPFG) is proposed and theoretically analyzed. As the refractive index decreases radially outward in the silica cladding by graded doping of fluorine, waveguide dispersion in the cladding modes was modified to result in the effective indexes change and subsequently the phase-matching conditions for coupling with the core mode in a LPFG. Enlargement of the FSR in a LPFG was theoretically confirmed.

© 2003 IEEE

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Appl. Opt. (1)

J. Lightwave Technol. (1)

A. M. Vengsarkar, P. J. Lemaire, J. B. Judkins, V. Bhatia and T. Erdogan, "Long-period fiber gratings as band-rejection filters", J. Lightwave Technol., vol. 14, pp. 58-65, Jan. 1996.

Opt. Lett. (1)

Other (16)

Q. Li, X. Liu, J. Peng, B. Zhou, E. R. Lyons and H. P. Lee, "Highly efficient acoustooptic tunable filter based on cladding etched single-mode fiber", IEEE Photon. Technol. Lett., vol. 14, pp. 337-339, Mar. 2002.

T. Volotinen, W. Griffoen, M. Ganonna, and H. G. Limberger, Eds. Reliability of Optical Fiber and Components-Final Report of COST 246, London: U.K: Springer-Verlag, 1999.

E. A. Chandross, D. A. Flemming, D. W. Johnson, J. B. MacChesney and F. W. Walz Jr., "Vitreous silica product manufactured via a sol-gel process using a polymer additives (1995)", U.S. Patent 5 379 364, Jan. 3, 1995.

K. Yoshida, T. Satoh, N. Enomoto, T. Yagi, H. Hihara and M. Oku, "Studies on the strength of optical fiber fabricated by a hybridized process", J. Lightwave Technol., vol. 14, no. 11, pp. 2513-2518, Nov. 1996.

H. Jeong and K. Oh, "Enhancement of free spectral range of the resonance peaks in a long-period fiber grating by controlling material dispersion of cladding modes", Opt. Commun., vol. 199, pp. 103 -110, 2001.

J. W. Fleming, "Material dispersion in lightguide glasses", Electron. Lett., vol. 14, p. 326, 1978.

J. Kirchhof, S. Unger and K.-F. Klein, "Diffusion behavior of fluorine in fiber lightguide materials", Optical Fiber Communication Conf. (OFC/IOOC) '93, Tech. Dig., p. 101, 1993.

M. Stern, "Finite-difference analysis of planar optical waveguides," in PIER 10 (Progress in Electromagnetic Research 10), W. P. Huang, Ed. Cambridge, MA: EMW Publishing, 1995, ch. 4.

T. Erdogan, "Cladding-mode resonances in short-and long-period fiber grating fibers", J. Opt. Soc. Amer. A, vol. 14, pp. 1760-1773, 1997.

C. Tsao, Optical Fiber Waveguide Analysis, New York: Oxford Univ. Press, 1992, ch. 10.

A. S. Kurkov, M. Douay, O. Duhem, B. Leleu, J. F. Henninot, J. F. Bayon and L. Rivoallan, "Long-period fiber grating as a wavelength selective polarization element", Electron. Lett., vol. 33, pp. 616-617, 1997.

H. J. Patrick, G. M. Williams, A. D. Kersey, J. R. Pedrazzani and A. M. Vengsarkar, "Hybrid fiber Bragg grating/long period fiber grating sensor for strain/temperature discrimination", IEEE Photon. Technol. Lett., vol. 8, pp. 1223-1225, Sept. 1996 .

T. Komukai, T. Yamamoto, T. Sugawa and Y. Miyajima, "Upconversion pumped thulium-doped fluoride fiber amplifier and laser operation 1.47 µm ", IEEE Quantum Electron., vol. 31, pp. 1880-1889, Nov. 1995 .

J. Kani, M. Jinno and K. Oguchi, "Fiber Raman amplifier for 1520-nm band WDM transmission", Electron. Lett., vol. 34, pp. 1745-1747, 1998.

R. I. Laming, M. N. Zervas and D. N. Payne, "Erbium-doped fiber amplifier with 54 dB gain and 3.1 dB noise figure", IEEE Photon. Technol. Lett., vol. 4, pp. 1345-1347, Dec. 1992.

J. F. Massicott, R. Wyatt and B. J. Ainslie, "Low noise operation of Er3+-doped silica fiber amplifier around 1.6 µm", Electron. Lett., vol. 28, pp. 1924-1925, 1992.

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