Abstract
A proposal for the new modifled W type optical flber structure with ultra high efiective area and small dispersion as well as dispersion slope is presented. For the proposed structure, all these features are achieved due to placing extra depressed cladding layers, which is the key to achieve higher efiective area and ∞at dispersion curve compared with the conventional W structures. Meanwhile, the suggested design method is based on the Genetic Algorithm optimization technique to choose optimal value for the structural parameters. Also, our calculation for extracting optical properties of the proposed structure is evaluated analytically. The designed dispersion ∞attened single mode flber has dispersion and its slope respectively within (0.1741{0.9282)ps/km/nm and ((i0:011){ (0.0035))ps/km/nm 2 in the spectral range of (1.46{1.625)m (S+C+L bands) which are noticeably smaller than the reported value for ultra- low dispersion slope flbers (5). The designed flber has ultrahigh efiective area from 103.56 to 232.26m 2 in the above wavelength interval. Meanwhile, we show that there is a breakthrough in the quality factor of the ultra-low, ultra-∞attened chromatic dispersion single mode optical flber.
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