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We numerically and experimentally demonstrated the generation flat-spectrum wideband chaos with efficient bandwidth of several tens of GHz and perfect time delay signature suppression using external-cavity semiconductor laser subject self-phase modulation and dual optical feedback.

A physical encryption scheme converting messages into noise-like signals is proposed, whose features include inherent transparency to modulation formats, bidirectional transmission suitability, plug-and-play in conventional optical communication systems and use of existing dispersion compensation modules.

We experimentally demonstrate a broadband chaos generation using semiconductor laser subject to self-phase-modulation and microsphere resonator, and a subsequent fast physical random bit generation beyond 300-Gbps by using the broadband chaos as entropy source.

We propose a new stream-cipher generation scheme based on the correlated physical random bit generation with synchronized chaotic lasers and pseudo-random bit extension RC4 algorithm. The proposed scheme shows high-security, extensible rate and strong robustness.

Chaos generated by a semiconductor laser subject to self-phase-modulated optical feedback is proposed, where the time-delay-signature is concealed and complexity is enhanced. Fascinatingly, the probability density distribution of its output intensity is close to symmetry.

We have experimentally demonstrated a novel security enhanced OFDM-PON based on DFT and chaos subcarrier scramble in an 8.85Gb/s@25km SSMF transmission system. The key space is over 1090 to be against exhaustive attack effectively.

We propose a security-enhanced communication scheme with time delay signature suppression and phase encryption, by using cascaded random phase modulation for the feedback. Moreover, the low frequency signature is well hidden in the frequency spectrum.

An energy-efficient and robust optical access network structure is proposed and investigated. By adopting the ring structure with network interconnection, substantial energy saving is achieved and all access links are simultaneously protected.

An energy-efficient ONU interconnection scheme is proposed for electronic switch based optical access networks. By separately performing traffic aggregation in downstream and upstream, substantial energy is saved and elastic capacity can be provided.

A new scheme for key distribution based on variant properties of chaos synchronization in cascaded semiconductor lasers with phase-modulation feedback. The security of the scheme relies on the practical difficulty of completely observing chaotic signals.

A novel passive optical network configuration based on synchronization of WDM chaotic signals and symmetrical subcarrier modulation multiplexing is introduced. The proposed scheme can greatly improve the physical layer security and enhance the communication capacity.