Secure OFDM-PON Bandwidth-limited System Precoded by Chaotic Frank Sequence-Based Circulant Matrix

We propose chaotic frank sequence-based circulant matrixes with ∼10
⁸⁸
key space. Encryption of 21.67-Gb/s-20km bandwidth-limited OFDM-PON has been experimentally demonstrated, which confirms the superior performance of the proposed scheme over the chaotic-DFT and chaotic-DHT.