High-speed physical key distribution based on mode-keying chaos synchronization of Fabry-Perot lasers

We propose and experimentally demonstrate a high-speed physical key distribution scheme based on chaos synchronization between a pair of multi-longitudinal-mode Fabry-Perot lasers commonly driven by a super-luminescent diode. Synchronization of modes with same wavelength in two lasers and desynchronization of the modes with difference wavelength are demonstrated. In the scheme, two modes are filtered as the entropy source. The legitimate users select one of the modes randomly and independently as output signals. The rules of selections are exchanged as private keys. When the selection of mode is same, the output signals are synchronized. By sampling and quantizing chaotic signals and comparing modulation information, we get consistent keys. In this work, key distribution with high speed of 1.67Gb/s are realized over 160km optical fiber with dispersion compensation.

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