Chaos-based communications at high bit rates using commercial fiber-optic links. A team of researchers from various institutions demonstrated high-speed, long-distance optical communications using chaos synchronization over a commercial fiber-optic channel. The system used a chaotic laser to encode a message, which was then transmitted over 120 km of fiber-optic cable in the Athens metropolitan area network. The message was decoded via synchronization with a second laser, which performed chaotic filtering of the encoded signal. Transmission rates of up to 3 Gb/s were achieved with bit-error rates below 10^-7. The system used matched pairs of semiconductor lasers and off-the-shelf fiber-optic components. The results showed that information can be transmitted at high bit rates using deterministic chaos in a robust manner, even under real-world conditions. Chaos-based communications use broadband chaotic signals as information carriers, offering robustness and privacy. This technology has potential applications in secure communications, complementing classical and quantum cryptography. The study demonstrated that chaos-based communications can achieve high transmission rates and low bit-error rates over long distances. The system used two different schemes: an electro-optical scheme where the message was added to the chaotic carrier inside the feedback loop, and an all-optical scheme where the chaotic carrier amplitude was modulated with the message. Both schemes achieved synchronization, with the all-optical scheme requiring careful tuning of the feedback phase. The researchers tested the system under real-world conditions using an installed optical network infrastructure. The system achieved bit-error rates below 10^-7 for transmission rates up to 3 Gb/s. The study also explored the effects of increasing code length and transmission rates on bit-error rates, finding that only a minor increase in BER was observed for longer code lengths. The results demonstrated the potential of chaos-based communications for high-speed, secure data transmission over commercial fiber-optic networks. The study highlights the potential of chaos-based communications for future secure and efficient data transmission systems.Chaos-based communications at high bit rates using commercial fiber-optic links. A team of researchers from various institutions demonstrated high-speed, long-distance optical communications using chaos synchronization over a commercial fiber-optic channel. The system used a chaotic laser to encode a message, which was then transmitted over 120 km of fiber-optic cable in the Athens metropolitan area network. The message was decoded via synchronization with a second laser, which performed chaotic filtering of the encoded signal. Transmission rates of up to 3 Gb/s were achieved with bit-error rates below 10^-7. The system used matched pairs of semiconductor lasers and off-the-shelf fiber-optic components. The results showed that information can be transmitted at high bit rates using deterministic chaos in a robust manner, even under real-world conditions. Chaos-based communications use broadband chaotic signals as information carriers, offering robustness and privacy. This technology has potential applications in secure communications, complementing classical and quantum cryptography. The study demonstrated that chaos-based communications can achieve high transmission rates and low bit-error rates over long distances. The system used two different schemes: an electro-optical scheme where the message was added to the chaotic carrier inside the feedback loop, and an all-optical scheme where the chaotic carrier amplitude was modulated with the message. Both schemes achieved synchronization, with the all-optical scheme requiring careful tuning of the feedback phase. The researchers tested the system under real-world conditions using an installed optical network infrastructure. The system achieved bit-error rates below 10^-7 for transmission rates up to 3 Gb/s. The study also explored the effects of increasing code length and transmission rates on bit-error rates, finding that only a minor increase in BER was observed for longer code lengths. The results demonstrated the potential of chaos-based communications for high-speed, secure data transmission over commercial fiber-optic networks. The study highlights the potential of chaos-based communications for future secure and efficient data transmission systems.