Figure 3. Passively mode-locked EDFL performances by reflection-type graphene saturable absorber.
(a) The photograph of gold-coated patchcord end-face with and without hydrogen-free and low temperature synthesized graphene on the surface. The inset: AFM image of gold film. (b) The oscilloscope trace of passively mode-locked EDFL. (c) and (d) The optical spectra and autocorrelation traces of reflection-type passively mode-locked EDFL system under different pumping current. (e) The varied pulsewidth and FWHM of reflection-type passively mode-locked EDFL system under different pumping current. (f) The time-bandwidth products of reflection-type passively mode-locked EDFL system under different pumping current.