100-Gbit/s 100-km Physical-Layer Secure Fiber-Optic Communication Using Wideband Chaotic Semiconductor Lasers
Xiaoxin Mao, Anbang Wang, Longsheng Wang, Songnian Fu, Yuncai Wang, Yuwen Qin
Abstract
Optical chaos communications have been proposed for secure data transmission with the potential of high bit rate and compatibility with existing fiber-optic systems. Semiconductor lasers are excellent candidate of chaotic transceivers thanks to their easy-to-integrate structures and high chaos complexity, but still encounter a key challenge that the transmission rate is lagged far behind the fiber-optic communication. Here, we experimentally demonstrate 100-Gbit/s optical chaos communication towards secure metropolitan transmission. State-of-the-art broadband chaos synchronization with a carrier bandwidth of 31.7 GHz is obtained by employing discrete-mode semiconductor lasers under the three-laser scheme, where two lasers are commonly driven by a third chaotic laser. The three-laser scheme also breaks the frequency limitation of laser relaxation oscillation on chaos cancellation decryption. Experiments achieve chaos-masking communication of 25-GBaud 16-QAM message over 100 km transmission with a bit error ratio of 1.6×10<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">−2</sup>, under assistance of digital signal processing. This work provides a solution to high-speed laser-chaos communication and facilitates the practical application of optical chaos communication in metropolitan area networks.