In-fibre diffraction grating based beam steering for full duplex optical wireless communication

A novel approach to achieve wavelength controlled optical beam steering using a 45° tilted fiber grating (TFG) for full-duplex indoor optical wireless transmission is proposed and experimentally demonstrated for the first time. The 45° TFG functions as an in-fiber passive diffraction device for wavelength steered light emission and reception, which enables full-duplex optical wireless transmission. The unique advantages of using an in-fiber TFG device for beam steering include high diffraction efficiency, low cost, compactness and inherent compatibility with existing fiber links. In a proof-of-concept experiment, 1.4 m freespace full-duplex transmission has been demonstrated with data rate of 9.6 Gb/s per beam using 2.4 GHz bandwidth signals.