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Chromatic dispersion profile optimization of dual-concentric-core photonic crystal fibers for broadband dispersion compensation

Takeshi Fujisawa, Kunimasa Saitoh, Keisuke Wada, and Masanori Koshiba

Open Access Open Access

Abstract

Chromatic dispersion profile of dual-concentric-core photonic crystal fibers is optimized for broadband dispersion compensation of single mode fibers (SMFs) by using genetic algorithm incorporated with full-vector finite-element method. From the numerical results presented here, it is found that by increasing the distance between central core and outer ring core, larger negative dispersion coefficient and better dispersion slope compensation are possible. There is a tradeoff between the magnitude of negative dispersion coefficient and dispersion slope compensation due to the concave dispersion profile of dual-concentric-core photonic crystal fibers. In spite of the tradeoff, dual-concentric-core photonic crystal fibers having larger negative dispersion coefficient as well as compensating for dispersion slope of SMFs in the entire C band with large effective area can be designed.

©2006 Optical Society of America

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Figures (6)
Fig. 1.
Fig. 1. Cross sections of (a) type 1, (b) type2, and (c) type 3 dual-concentric-core photonic crystal fibers.

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Fig. 2.
Fig. 2. Dispersion curves of type 1 DCPCF with Λ = 2.5 μm, d/Λ = 0.65, dr /Λ = 0.22 (solid curve), type 2 DCPCF with Λ = 1.8 μm, d/Λ = 0.45, dr /Λ = 0.25 (dashed curve), and type 3 DCPCF with Λ = 1.6 μm, d/Λ = 0.4, dr /Λ = 0.25 (dash-dot curve).

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Fig. 3.
Fig. 3. (a) Optimized chromatic dispersions of type 1 DCPCF for different values of X and (b) corresponding residual dispersion after compensating for 80-km SMF.

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Fig. 4.
Fig. 4. (a) Optimized chromatic dispersions of type 2 DCPCF for different values of X and (b) corresponding residual dispersion after compensating for 80-km SMF.

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Fig. 5.
Fig. 5. (a) Optimized chromatic dispersions of type 3 DCPCF for different values of X and (b) corresponding residual dispersion after compensating for 80-km SMF.

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Fig. 6.
Fig. 6. (a) Confinement losses of the optimized DCPCF as a function of the number of the rings. (b) Bending losses of the optimized DCPCF as a function of bending radius.

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Tables (4)

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Table 1. Searching areas for each parameter in GA analysis.

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Table 2. Optimized structural parameters for type 1 DCPCF and values of DDCPCF and Aeff 1.55 μm.

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Table 3. Optimized structural parameters for type 2 DCPCF and values of DDCPCF and Aegat 1.55 μm.

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Table 4. Optimized structural parameters for type 3 DCPCF and values of DDCPCF and Aegat 1.55 μm.

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Equations (4)

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F ( Λ , d / Λ , d r / Λ ) = exp ( w 1 f 1 ) + f 2
f 1 = − ∑ λ = 1.53 μ m 1.565 μ m ∣ D t arg et ( λ ) + D DCPCF ( λ ) ∣
f 2 = { − 0.9 exp ( w 1 f 1 ) if A eff @ 1.55 μ m < 20 μ m 2 0 else
D t arg et ( λ ) = X × D SMF ( λ )
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