Efficiency 2 Four wave mixing Optical frequency conversion 2 Pumping (laser) Amplified spontaneous emissions 1 Atomic system 1 Atoms 1 Cesium 1 Cesium atom 1 Continuous wave lasers 1 Conversion efficiency 1 Degenerate four wave mixing 1 Dual-wavelength 1 Dual-wavelength fibre laser 1 Entanglement generation 1 Erbium 1 Erbium-doped fibre lasers 1 Experimental realizations 1 FWM conversion efficiency 1 Fibers 1 Fibre lasers 1 Four-wave mixing (FWM) 1 Frequency conversions 1 Generation frequency 1 High-power 1 Highly non-linear fibres 1 Highly nonlinear fibre (HNLF) 1 Nondegenerate four wave mixing 1 Optical data processing 1 Phase matching 1