Abstract

A wavelength-selective coupler constructed with two parallel identical uniform long-period fiber gratings (LPFGs) is analyzed by the coupled-mode theory. The effects of introducing a longitudinal offset distance between the two gratings on the transmission characteristics of the coupler are discussed and the conditions for achieving a 100% coupling efficiency are highlighted. It is found that 100% coupling can be achieved with a practical grating length by using a proper grating design and a suitable index-matching surrounding medium. The theoretical results agree well with the experimental data.

© 2004 IEEE

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J. Lightwave Technol. (3)

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

W. P. Huang and H. A. Haus, "Power exchange in grating-assisted couplers", J. Lightwave Technol., vol. 7, pp. 920-924, 1990.

X. Shu, L. Zhang and I. Bennion, "Sensitivity characteristics of long-period fiber gatings", J. Lightwave Technol., vol. 20, pp. 255-266, 2002.

Opt. Lett. (5)

Other (16)

L. Dong, P. Hua, T. A. Birks, L. Reekie and P. S. J.P. St. J. Russell, "Novel add/drop filters for wavelength-division multiplexing optical fiber systems using a Bragg grating assisted mismatched coupler", IEEE Photon. Technol. Lett., vol. 8, pp. 1656-1658, 1996.

J. Lauzon and A. Chandonnet, "Grating-assisted fused fiber filter", in Proc. 11th Int. Conf. Integrated Optics and Optical Fiber Commun. 23rd Europ. Conf. Optical Commun., Edinburgh, U.K., 1997, pp. 169-172.

P. K. Lam, A. J. Stevenson and J. D. Love, "Bandpass spectra of evanescent couplers with long period gratings", Electron. Lett., vol. 36, pp. 251-252, 2000.

A. W. Snyder, "Coupled-mode theory for optical fibers", J. Opt. Soc. Amer., vol. 62, pp. 1267-1277, 1972.

A. Ankiewicz, A. W. Snyder and X.-H. Zheng, "Coupling between parallel optical fiber cores-critical examination", J. Lightwave Technol., vol. LT-4, pp. 1317-1323, 1986.

A. A. Abramov, A. Hale, R. S. Windeler and T. A. Strasser, "Widely tunable long-period fiber gratings", Electron. Lett., vol. 35, pp. 81-82, 1999.

J. R. Qian and H. F. Chen, "Gain flattening fiber filters using phase-shifted long period fiber gratings", Electron. Lett., vol. 34, pp. 1132-1133, 1998.

M. K. Pandit, K. S. Chiang, Z. H. Chen and S. P. Li, "Tunable long-period fiber gratings for EDFA gain and ASE equalization", Microwave Opt. Technol. Lett., vol. 25, pp. 181-184, 2000.

H. J. Patrick, A. D. Kersey and F. Bucholtz, "Analysis of the response of long period fiber gratings to external index of refraction", J. Lightwave Technol. , vol. 16, pp. 1606-1612, 1998.

K. S. Chiang, Y. Liu, M. N. Ng and X. Dong, "Analysis of etched long-period fiber grating and its response to external refractive index", Electron. Lett., vol. 36, pp. 966-967, 2000.

M. N. Ng and K. S. Chiang, "Thermal effects on the transmission spectra of long-period fiber gratings", Opt. Commun., vol. 208, pp. 321-327, 2002.

H. J. Patrick, C. C. Chang and S. T. Vohra, "Long period fiber gratings for structural bend sensing", Electron. Lett., vol. 34, pp. 1773-1775, 1998.

M. N. Ng, Z. Chen and K. S. Chiang, "Temperature compensation of long-period fiber grating for refractive-index sensing with bending effect", IEEE Photon. Technol. Lett., vol. 14, pp. 361-363, 2002.

K. S. Chiang, Y. Liu, M. N. Ng and S. Li, "Coupling between two parallel long-period fiber gratings", Electron. Lett., vol. 36, pp. 1408-1409, 2000.

K. S. Chiang, M. N. Ng, Y. Liu and S. Li, "Evanescent-field coupling between two parallel long-period fiber gratings", in Proc. IEEE Lasers Electro-Opt. Soc. Conf., Puerto Rico, 2000, pp. 836-837.

V. Grubsky, D. S. Starodubov and J. Feinberg, "Wavelength-selective coupler and add-drop multiplexer using long-period fiber gratings", in Tech. Dig., Opt. Fiber Commun. Conf., vol. 4, 2000, pp. 28-30.

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