Abstract

We numerically demonstrate ultraflattened chromatic dispersion with low losses in microstructured optical fibers (MOFs). We propose using two different MOF structures to get this result. Both structures are based on a subset of a triangular array of cylindrical air holes; the cross sections of these inclusions are circular, and a missing hole in the fiber’s middle forms the core. In this MOF structure the diameters of the inclusions increase with distance from the fiber axis until the diameters reach a maximum. With this new design and with three different hole diameters, it requires only seven rings to reach the 0.2dB/km level at λ=1.55 µm with a variation amplitude of dispersion below 3.0×10-2 ps nm-1 km-1 of λ=1.51.6 µm. With the usual MOF (made from holes of identical diameter), we show that at least 18 hole rings are required for losses to decrease to <1 dB/km at λ=1.55 µm.

© 2003 Optical Society of America

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References

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2003 (1)

2002 (4)

2001 (2)

2000 (2)

1998 (1)

Agrawal, G. P.

G. P. Agrawal, Nonlinear Fiber Optics (Academic, San Diego, Calif., 1989).

Andrés, M.

Andrés, P.

Birks, T.

Botten, L.

de Sterke, C.

de Sterke, M.

Ferrando, A.

Knight, J.

Kuhlmey, B.

Maystre, D.

McPhedran, R.

Miret, J.

Mogilevstev, D.

Reeves, W.

Renversez, G.

Robinson, P.

Russell, P. St. J.

Silvestre, E.

Steel, M.

White, T.

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Figures (4)

Fig. 1
Fig. 1

Dispersion decay at λ=1.55 µm as a function of the total number of hole rings Nr for several MOF structures. Λ is the hole spacing, and d is the hole diameter. The points correspond to the computed numerical dispersion; the curves, to exponential based fits.

Fig. 2
Fig. 2

Limit dispersion (solid lines, left y scale) and limit dispersion slope (dashed lines, right y scale) at λ=1.55 µm as a function of hole diameter d only, for several pitches. The chosen parameter values for Λ and d correspond to the small limit slope region. Inset, cross section of the modeled MOF with three rings of holes (holes are shown shaded), Nr=3. Λ is the hole spacing and dn is the hole diameter of the nth ring. The solid core consists of one missing hole in the center of the structure.

Fig. 3
Fig. 3

Waveguide dispersion DW, dispersion D, and sign-changed material dispersion -Dmat for three six-ring MOF structures. The line style of a MOF structure is identical for DW and D. Λ and the diameters are given in micrometers. (a) Λ=2.3, d=0.7; (b) Λ=2.45, d=0.6; (c) Λ=2.3, d=0.6.

Fig. 4
Fig. 4

Waveguide dispersion DW, dispersion D for the MOF structures that we proposed, and sign-changed material dispersion -Dmat. Unless stated, the total number of rings Nr in the MOF is three. The line style of a MOF structure is identical for DW and D. Λ and the diameters are given in micrometers. dn is the hole diameter of the nth ring, and dn1-n2 denotes the hole diameter of the n1th to n2th rings. (1) Λ=1.9, d1=0.559, d2=0.782, d3=0.894; (2) Λ=1.8, d1=0.529, d2=0.741, d3=0.847; (3) Λ=1.7, d1=0.5, d2=0.7, d3=0.8; (4) Nr=47, Λ=1.7, d1=0.5, d2=0.7, d37=0.8; (5) Λ=1.65, d1=0.485, d2=0.679, d3=0.776.

Equations (1)

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DWλ,Λ/Λref,f1,f2,,fnΛrefΛDWλΛref/Λ,1,f1,f2,,fn,

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