Wavelength shift of four-wave mixing bands in photonic crystal fibers pumped in the normal dispersion regime

The generation of correlated photon pairs plays a central role in several quantum mechanics applications, such as quantum information, and cryptography. Correlated photon pairs can be generated inside an optical fiber through the parametric process of degenerated four-wave mixing (FWM). In this paper the authors report the results of two different experiments where wavelength shift of FWM bands in normal dispersive PCFs is investigated.