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High-index-core Bragg fibers: dispersion properties

Juan A. Monsoriu, Enrique Silvestre, Albert Ferrando, Pedro Andrés, and Juan J. Miret

Open Access Open Access

Abstract

We study the group-velocity-dispersion properties of a novel type of Bragg fibers. These new structures are cylindrically symmetric microstructured fibers having a high-index core (silica in our case), like in conventional photonic crystal fibers, surrounded by a multilayered cladding, which is formed by a set of alternating layers of silica and a lower refractive-index dielectric. The combination of the unusual geometric dispersion behavior shown by the multilayered structure and the material dispersion corresponding to the silica core allows us to design nearly-constant chromatic dispersion profiles. In this work we focus our attention on flattened dispersion fibers in the 0.8 µm wavelength window and even on ultraflattened dispersion structures about the 1.55 µm point. We include configurations owning positive, negative, and nearly-zero dispersion in both wavelength ranges.

©2003 Optical Society of America

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Figures (6)
Fig. 1.
Fig. 1. Schematic diagram of a high-index-core Bragg fiber.

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Fig. 2.
Fig. 2. Band-gap structure and modal dispersion relation curves for two angular sectors: (a) ν=1 (HE modes), and (b) ν=0 (only TE modes). In both cases, Λ=1.190 µm and a=0.248 µm. Conduction bands are represented by the shaded regions.

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Fig. 3.
Fig. 3. Transverse intensity distribution for: (a) the fundamental guided mode HE11 in Fig. 2, and (b) the first intraband guided mode TE01 in Fig. 2. In both cases, λ=0.8 µm.

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Fig. 4.
Fig. 4. Positive (Λ=1.170 µm and a=0.266 µm), nearly-zero (Λ=1.190 µm and a=0.248 µm), and negative (Λ=1.210 µm and a=0.232 µm) flattened dispersion curves near 0.8 µm.

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Fig. 5.
Fig. 5. Positive (Λ=4.900 µm and a=0.115 µm), nearly-zero (Λ=4.210 µm and a=0.094 µm), and negative (Λ=3.600 µm and a=0.082 µm) ultraflattened dispersion curves near 1.55 µm.

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Fig. 6.
Fig. 6. Dispersion (solid curves) and relative dispersion slope (broken curves), defined as RDS=(dD/dλ)/D, corresponding to three different selections of the structural parameters to achieve zero four-ordered dispersion at 1.55 µm: red curve (Λ=4.710 µm and a=0.090 µm), blue curve (Λ=4.570 µm and a=0.094 µm), and green curve (Λ=4.465 µm and a=0.096 µm).

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Equations (2)

Equations on this page are rendered with MathJax. Learn more.

D g ( λ ) = − ( λ c ) d 2 n g d λ 2 .
D ( λ ) = − ( λ c ) d 2 n d λ 2 ,
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