Abstract: We introduce a novel high average power (>100 mW) fiber optic source, using a wavelength converter based on optical parametric amplification in a nonlinear fiber. In the most fundamental embodiment, light at two different wavelengths is used to generate light at a third wavelength through optical parametric amplification in a highly non-linear fiber. The method provides high average output power at wavelengths that are not accessible by other means. The source has high optical conversion efficiency (>20%), and it can be tuned over tens of nanometers.