Abstract
A ZBLAN photonic crystal fiber (PCF) with normal dispersion is theoretically designed and investigated. The designed PCF can provide a large normal dispersion coefficient and a low confinement loss in a broad wavelength range of 1.8-3.6 μm. Especially, the PCF exhibits an ultra large normal dispersion value of -351.3 ps/km/nm and a small confinement loss of 0.05 dB/m at 2.9 μ m. By using the designed PCF as a dispersion compensator in a mode-locked ZBLAN fiber laser, stretched pulse with compressed pulse duration of 1.56 ps is numerically achieved.
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