Design of dispersion-compensating fibers based on a dual-concentric-core photonic crystal fiber

A photonic crystal fiber based on a particular periodic arrangement of airholes and pure silica is designed for chromatic dispersion compensation. A two-concentric-core structure is obtained by introducing two different sizes of capillaries (for the airholes) and exhibits very high negative chromatic dispersion $[-2200 \mathrm{ps}/\left(\mathrm{nm} \mathrm{km}\right)$ at $1550 \mathrm{nm}]$. The variation of optogeometric parameters is also investigated to evaluate the tolerance of the fabrication. Finally, the bending influence on the modal characteristics shows that it is possible to tune the phase-matching wavelength over the $C$ band by adjusting the diameter of the fiber.