Arrayed waveguide gratings 1550 nm 1 Beam-steering 1 Bismuth 1 Broadband amplifiers 1 Continuous Wave 1 Data transfer 1 Data-transmission speed 1 Erbium 1 Erbium-doped optical amplifier 1 Experimental approaches 1 Four wave mixing 1 Indoor optical wireless communications 1 Line of Sight 1 Lines-of-sight 1 Mixing 1 Multiple outputs 1 Nonlinear medium 1 Optical fiber communication 1 Optical fibers 1 Optical switches 1 Optical waveguides 1 Optical wireless communication systems 1 Optical-wireless communications 1 Semiconductor optical amplifiers 1 Source arrays 1 Surface emitting lasers 1 Tunables 1 Two wavelength 1 Ultra-fast 1