Abstract
A pure silica photonic crystal fiber with a group velocity dispersion (β2) of 4 ps2/km at 1.55μm and less than 7 ps2/km from 1.32μm to the zero dispersion wavelength (ZDW) 1.80μm was designed and fabricated. The dispersion of the fiber was measured experimentally and found to agree with the fiber design, which also provides low loss below 1.83μm due to eight outer rings with increased hole diameters. The fiber was pumped with a 1.55μm, 125fs laser and, at the maximum in-coupled peak power (P0) of 9kW, a 1.34-1.82μm low-noise spectrum with a relative intensity noise below 2.2% was measured. The numerical modeling agreed very well with the experiments and showed that P0 could be increased to 26kW before noise from solitons above the ZDW started to influence the spectrum by pushing high-noise dispersive waves through the spectrum.
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