We have investigated the validity of the V parameter to identify the single-mode operation regime for photonic quasi-crystal fibers. Our results show that the V parameter can be considered only for smoothly changing fibers. On the other hand, for fibers showing isolated high refractive regions around the core, only a mode area analysis can allow the estimation of the threshold for the single-mode operation regime. Finally, these findings can be generalized to any kind of optical fiber.

© 2010 Optical Society of America

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Atkin, D. M.

Birks, T. A.

de Sterke, C. M.

Folkenberg, J. R.

Hansen, K. P.

Hansen, T. P.

Jakobsen, C.

Kee, C.-S.

Kim, S.

Knight, J. C.

Koshiba, M.

Kuhlmey, B. T.

Lee, J.

McPhedran, R. C.

Mortensen, N. A.

Nielsen, M. D.

Russell, P. St. J.

Saitoh, K.

Simonsen, H. R.

Tsuchida, Y.

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Figures (4)

Fig. 1
Fig. 1

Cross section of three kinds of PQFs: (a) sixfold, (b) eightfold, and (c) tenfold. Gray filled circles denote air holes drilled in silica fiber. The central hole (empty circle) is absent in the fibers. The quantities A and d represent the lattice constant and the hole diameter, respectively.

Fig. 2
Fig. 2

Effective V parameter (black squares and curves) and the second-order mode normalized area (red circles and curves) as a function of A λ for (a) sixfold, (b) eightfold, and (c) tenfold quasi-crystal fibers. The dashed lines are drawn at π.

Fig. 3
Fig. 3

Simulation results for the second-order modes for (a), (b) eightfold PQF and (c), (d) sixfold PQF, at indicated wavelengths.

Fig. 4
Fig. 4

Simulation results for the second-order mode of a traditional coaxiallike fiber at indicated wavelengths.

Equations (1)

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V eff ( λ ) = 2 π A λ [ n co , eff 2 ( λ ) n cl , eff 2 ( λ ) ] 1 2 ,