Widely tunable optical parametric generation in a photonic crystal fiber

We report on the observation of widely tunable optical parametric generation in a photonic crystal fiber. The frequency shift of the generated sidebands that arise from modulational instability is strongly dependent on the detuning of the pump from the fiber’s zero-dispersion wavelength. We are able to demonstrate experimentally more than $450\mathrm{nm}$ of sideband tunability as we tune the pump wavelength over $10\mathrm{nm}$. Excellent agreement has been found between the experimentally measured and theoretically predicted shifts.