Abstract

We propose a novel optical fiber design that consists of a uniform core and a segmented cladding formed by alternate regions of high and low refractive indices in the azimuthal direction. The structure is analyzed by use of the radial effective-index method, and the propagation characteristics of the structure are studied. The fiber has a highly dispersive cladding and shows characteristics similar to those of photonic-crystal fibers and holey fibers. The novel fiber offers the possibility of single-mode operation over a wide range of wavelengths with a large core diameter.

© 2001 Optical Society of America

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References

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1999

1998

1997

1987

1981

K. Morishita, IEEE Trans. Microwave Theory Technol. MTT-29, 348 (1981).
[CrossRef]

Andres, M. V.

Andres, P.

Barkou, S. E.

Bennett, P. J.

Birks, T. A.

Bjarklev, A.

Broderick, N. G. R.

Broeng, J.

S. E. Barkou, J. Broeng, and A. Bjarklev, Opt. Lett. 24, 46 (1999).
[CrossRef]

J. C. Knight, J. Broeng, T. A. Birks, and P. St. J. Russell, Science 282, 1476 (1998).
[CrossRef] [PubMed]

Chiang, K. S.

De Sandro, J. P.

Ferrando, A.

Knight, J. C.

Miret, J. J.

Mogilevtsev, D.

Monro, T. M.

Morishita, K.

K. Morishita, IEEE Trans. Microwave Theory Technol. MTT-29, 348 (1981).
[CrossRef]

Richardson, D. J.

Russell, P. St. J.

Silvestre, E.

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Figures (5)

Fig. 1
Fig. 1

Segmented cladding fiber with core radius a and cladding radius b. n1 and n2 are the refractive indices of the segments, and 2θ1 and 2θ2 are the corresponding angular widths.

Fig. 2
Fig. 2

Effective-index profile of the fiber at the wavelength 632.8  nm. The fiber parameters are n1=1.46, n2=1.455, a=6 μm, b=25 μm, and γ=2.4/π. The dashed lines show the mode indices of the first few quasi-cylindrically symmetric modes.

Fig. 3
Fig. 3

(a) Radial parts of the field profiles of the fundamental mode and the higher-order mode of the segmented cladding fiber at the wavelength 632.8  nm for γ=2.4/π. Also shown are the contour plots of the intensity distributions for (b) the fundamental mode and (c) the higher-order mode.

Fig. 4
Fig. 4

Dispersion curve (solid curve) for the fundamental mode of a segmented cladding fiber with physical parameters as in Fig.  2. The dashed line shows the refractive index of the core, and the dotted curve shows the effective cladding index.

Fig. 5
Fig. 5

Variation of V with wavelength λ for different duty cycles γ. The horizontal dotted line marks the single-mode limit of a step-index fiber (i.e., V=2.4048). The case of γ=1 corresponds to a conventional step-index fiber.

Equations (4)

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2ϕr2+1rϕr+1r22ϕθ2+k2n2r,θ-neff2ϕ=0,
ϕr,θ=ϕrrϕθr,θ.
d2ϕθri,θdθ2+k2n2ri,θ-neffr2riri2ϕθri,θ=0
d2ϕrdr2+1rdϕrdr+k2neffr2r-neff2ϕr=0.

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