Figure 1

Experimental setup for wavelength conversion based on degenerate/non-degenerate FWM in graphene coated fiber device.
Inset: “sandwiched structure” graphene sample used as a nonlinear optical device. ECL: external cavity laser; AWG: arbitrary waveform generator; TF: tunable filter; OC: optical coupler; PC: polarization controller; OSA: optical spectrum analyser.