Joint PAPR Reduction and Physical Layer Security Enhancement in OFDMA PON
For joint peak to average power ratio (PAPR) reduction and physical layer security enhancement, we propose a chaos IQ encryption based optimal frame transmission technique in an orthogonal frequency division multiple access based passive optical network (OFDMA PON) The chaos IQ encryption technique is utilized to enhance the physical layer security. In encrypting, the in phase (I) and quadrature phase (Q) parts of the quadrature amplitude modulation (QAM) symbols are coded with two phase sequences separately, which are generated using a 2 D logistic map. The encrypted OFDM symbols comprise an OFDM frame, and the frame with the minimum PAPR is transmitted to the optical network unit side. Thus, the transmitted OFDM signal is of a joint low PAPR and high physical layer security. In the demonstration, an 11.32 Gb/s encrypted 16 QAM OFDM signal has been experimentally transmitted over 25 km standard single mode fiber in an intensity modulation/direct detection OFDMA PON.
IEEE Photonics Technology Letters