Abstract
Photonic crystal fiber (PCF) with a double-cladded coaxial core (CC) is proposed and analyzed to obtain propagation characteristics such as chromatic dispersion, field distribution, and effective area. Only by doubling the number of air holes to 12 in the inner hexagonal cladding layer with one pitch (Λ) value can the chromatic dispersion shift close to zero be achieved at 1.55 μm operation wavelength. The fundamental mode field for the double-cladded CCPCF is tightly confined to the central core region. Therefore, the effective area is normally very small, while it tends to be larger rather rapidly as the operating wavelength is longer than around 1.7 μm.
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