Ultrafast Mode-Locked Fiber Laser Employing New Scheme of Cr-Doped Fiber and Reduced Graphene Oxide

The 1400-nm ultrafast mode-locked Cr-doped fiber lasers (MLCDFLs) employing new scheme of single-mode chromium-doped fiber (SMCDF) as optical gain and reduced graphene-oxide (RGO) as saturable absorber is demonstrated for the first time. The output pulse width, average output power, and repetition rate were 118-fs, 2.95-mW, and 15.9-MHz, respectively.