RAKHI BHATTACHARYA^1,* , S. KONAR¹

Abstract

We have designed a set of microstructure fibers with triangular lattice of air holes having eleven rings which can yield ultra flat dispersion characteristics with very large normal dispersion. The dispersion characteristics and mode field of the fundamental mode have been theoretically investigated using the finite difference time domain (FDTD) method. When diameter of the air holes of the fifth, sixth and seventh rings are small in comparison to air holes of remaining rings this fiber exhibits large flat normal dispersion over a wide wavelength range covering entire S, C and L bands. The value of the exhibited uniform normal dispersion profile of the fiber can be controlled by controlling the hole diameter d of different rings and hole pitch Λ as well. Largest normal dispersion is achieved with a specific set of d and Λ. For any other combination of d and Λ the value of normal dispersion decreases from earlier optimum value. Investigated mode field in all cases show that the fundamental is mode always confined within the fiber core..

Keywords

Optical fiber, Flat negative dispersion, Photonic crystal.

Submitted at: Dec. 14, 2007
Accepted at: Dec. 10, 2008

Citation

RAKHI BHATTACHARYA, S. KONAR, Design of microstructure fibers with flat negative dispersion over large wavelength bands, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 12, pp. 3159-3164 (2008)

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