Designing dispersion-compensating photonic-crystal fibers using a genetic algorithm |
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Authors: | RR Musin |
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Institution: | Physics Department, International Laser Center, M.V. Lomonosov Moscow State University, Vorob’evy gory, Moscow 119992, Russia |
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Abstract: | A genetic algorithm is combined with a fully vectorial finite-element solver to design photonic-crystal fibers (PCFs) for a broadband dispersion compensation in a generic stretcher-compressor system of an ytterbium fiber laser. Two types of PCFs are compared in terms of their dispersion-compensation capability, optical nonlinearity, and confinement loss. Fibers of the first type are standard PCFs where a solid core is surrounded by a triangular uniform lattice of identical air-holes. In PCFs of the second type, the solid core is surrounded by a dual-scale cladding, where the inner part comprises air-holes of different diameters, while the outer cladding consists of large-diameter air-holes. Second-type PCFs are shown to provide a much more accurate dispersion compensation. The influence of fiber-fabrication tolerances on the precision of dispersion compensation in short-pulse fiber laser systems is examined. |
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Keywords: | 42 65 Wi 42 81 Qb |
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