Abstract
The modal properties of index-guiding photonic crystal fibers (IGPCFs) with and without interstitial air holes (IAHs) are numerically investigated by the multipole method. It is shown that the IAHs can favorably decrease the confinement loss and the effective mode area of IGPCFs, and simultaneously increase the nonlinear coefficient in the IGPCFs. In addition, at the same air hole diameter d and pitch Λ, IGPCFs with IAHs can shift the position of the zero-dispersion wavelengths to the shorter wavelengths and make the group-velocity dispersion more flattened in the region of anomalous dispersion. By comparing the optical properties of the PCFs in the presence/absence of IAHs and at the same air-filling fractions, it is shown that the change in the optical properties induced by the presence of IAHs is different from those achieved by a simple increase of the air-filling fraction, a result attributed to stronger scattering by IAHs.
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42.81.-I; 42.81.Bm; 42.81.Qb
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Li, S., Li, Y., Zhang, H. et al. Influence of interstitial air holes in index-guiding photonic crystal fibers on their basic properties. Appl. Phys. B 87, 71–74 (2007). https://doi.org/10.1007/s00340-006-2522-5
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DOI: https://doi.org/10.1007/s00340-006-2522-5