Abstract

The birefringence of an optical fiber resulting from an asymmetry of the index profile is numerically evaluated using a finite-element method with a full-vectorial formulation. Such asymmetric index profiles, assumed to vary exponentially across the fiber core, could be induced during the writing of fiber Bragg gratings with UV side-exposure techniques. The results reveal that the birefringence is a quadratic function of the effective index change. An asymmetry coefficient near 0.4 µm-1 maximizes the birefringence. The calculated photo-induced birefringence is negligible if the index change is lower than 5 ×10-4. However, the birefringence can reach 5 ×10-6 for large values of index change. The numerical method presented could be applied to the modeling of other asymmetric index profiles.

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J. Lightwave Technol. (3)

V. Mizrahi, D. J. DiGiovanni, R. M. Atkins, S. G. Grubb, Y.-K. Park and J.-M. Delavaux, "Stable single-mode erbium fiber-grating laser for digital communication", J. Lightwave Technol., vol. 11, pp. 2021-2025, Dec. 1993.

M. Fontaine, B. Wu, V. P. Tzolov, W. J. Bock and W. Urbanczyk, "Theoretical and experimental analysis of thermal stress effects on modal polarization properties of highly birefringent optical fibers", J. Lightwave Technol., vol. 14, pp. 585-591, Apr. 1996.

M. Koshiba, S. Maruyama and K. Hirayama, "A vector finite element method with the high-order mixed-interpolation-type triangular elements for optical waveguiding problems", J. Lightwave Technol., vol. 12, pp. 495-502, Mar. 1994 .

Opt. Lett. (3)

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