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Ge‐doped microstrutured fiber design by genetic algorithm for directional coupling

A new design of a microstructured optical fiber using cylindrical perfectly matched layers is proposed and analyzed through the vectorial beam propagation method (VBPM) in conjunction with genetic algorithm (GA). The fiber is made up from silica doped with germanium and it contains two and three identical horizontals cores surrounded by air holes. First, the signal power launched in the left core is completely transferred to the neighbor core with 100% of the coupling ratio. Next, the signal power launched in the central core is equally divided between the two neighboring cores with 50% of the coupling ratio. Through numerical simulations, it is demonstrated that the optical power can be completely transferred for a propagation distance around 6000 μm to the first application and 4000 μm to the second application. The behavior of the resulting geometry has been optimized by a genetic algorithm in conjunction with an efficient vectorial finite element formulation (GE‐VBPM). © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:281–285, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27308