Continuous-wave supercontinuum generation in a 100-m high nonlinear photonic crystal fiber

To our best knowledge, the most supercontinuum sources generated by use of cw pump lasers were obtained with fiber interaction lengths of the order of 100 m to a few kilometers to enhance the optical nonlinearity. However, the material loss was accumulated and the price cost was boosted in the long fibers. In this paper, CW supercontinuum generation by use of a 1480-nm fiber-Raman laser (FRL) in a 100-m high-nonlinear photonic crystal fiber (PCF) together with a 76-km single mode fiber (SMF) was demonstrated. The broadband supercontinuum was obtained with 10-dB bandwidth of 124 nm spanning from 1476 to 1600 nm. It was shown that the principal mechanism of the broadening could be assigned to stimulated Raman scattering, four-wave mixing (FWM) and modulation instability (MI).