Flat Supercontinuum Generation in Tellurite Fiber Pumped in Deep Normal Dispersion Region

We demonstrate flat supercontinuum (SC) generation in a piece of step-index tellurite fiber pumped by a noise-like mode-locked fiber laser in the deep normal dispersion region. The noise-like pulse emitted from a simple all-fiber mode-locked laser is used as the pump directly and the cascaded stimulated Raman scattering leads to the spectral broadening to the long wavelength region. Flat SC spanning from~1570 nm to ~1900 nm is obtained and no obvious spectral defects are observed. These results show the great advantage of noise-like pulse pumping in the deep normal dispersion region and the potential of noise-like pulse pumped mid-infrared SC generation.