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Supercontinuum generation in solid-core photonic bandgap fibers

Solid-core Photonic BandGap Fibers (PBGFs) exhibit exotic spectral and dispersion properties, making them particularly interesting for nonlinear fiber optics experiments. The presence of one zero dispersion wavelength (ZDW) in each transmission window allows pumping in the anomalous dispersion regime in the visible and designing fibers with multiple ZDWs. Nonlinear propagation experiments in solid-core PBGFs have been previously reported only in the femtosecond pumping regime: soliton propagation and dispersive wave generation have been observed in a liquid filled photonic crystal fiber with high index contrast [1] and in a hybrid photonic crystal fiber, which guides light by a combination of total internal reflection and bandgap effects [2]. Moreover, degenerate four-wave mixing between different bandgaps has been investigated only numerically [3]. Here, we report a significant supercontinuum generation in a solid-core PBGF (in which light is guided by a photonic bandgap effect), with low-index contrast resonators, in the nanosecond pumping regime.