Robust and Secure Indoor Optical Wireless Communications Supporting Multiple Users

We experimentally demonstrate a robust and secure multiple-access mechanism for indoor optical wireless communications using time-slot-coding and chaotic phase. Results show that it is secure against eavesdropper's exhaustive searching accuracy as high as 1e-10 and is robust against 67% (4-QAM) and 23% (16-QAM) code misalignment.