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.

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2007 (1)

2005 (1)

2004 (1)

2003 (2)

2002 (2)

1997 (1)

1996 (1)

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 ,