Modeling of realistic cladding structures for air-core photonic bandgap fibers |
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Authors: | Mortensen Niels Asger Nielsen Martin Dybendal |
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Affiliation: | Crystal Fibre A/S, Blokken 84, DK-3460 Birkerod, Denmark. asger@mailaps.org |
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Abstract: | Cladding structures of photonic bandgap fibers often have airholes of noncircular shape, and, typically, close-to-hexagonal airholes with curved corners are observed. We study photonic bandgaps in such structures by aid of a two-parameter representation of the size and curvature. For the fundamental bandgap we find that the bandgap edges (the intersections with the air line) shift toward shorter wavelengths when the air-filling fraction f is increased. The bandgap also broadens, and the relative bandwidth increases exponentially with f2. Compared with recent experiments [Nature 424, 657 (2003)] we find very good agreement. |
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