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Optics Letters

32 Gb/s physical-layer secure optical communication over 200 km based on temporal dispersion and self-feedback phase encryption

Zhensen Gao, Qihua Li, Lihong Zhang, Bin Tang, Ying Luo, Xulin Gao, Songnian Fu, Zhaohui Li, Yuncai Wang, Yuwen Qin

Published Jan 12, 2022• 50 citations
Publisher

Abstract

Providing physical layer security at the lowest network layer in fiber-optic communication systems is a technical challenge worldwide. Here, we propose and experimentally demonstrate a pure hardware optical encryption scheme based on temporal spreading and self-feedback phase encryption for high-speed and long-distance physical-layer secure optical communication. A record high bit-rate-distance product of 6400 Gb/s km is successfully achieved by the secure transmission of a 32 Gb/s on-off-keying modulated confidential signal over a 200 km optical fiber link. The demonstrated scheme is fully compatible with conventional optical transmission systems and can be operated in a pluggable manner, which may pave a new path to ultra-high-speed physical-layer secure optical communication in the future.

DOI
10.1364/ol.451314

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Providing physical layer security at the lowest network layer in fiber-optic communication systems is a technical challenge worldwide. Here, we propose and experimentally demonstrate a pure hardware optical encryption scheme based on temporal spreading and self-feedback phase encryption for high-speed and long-distance physical-layer secure optical communication. A record high bit-rate-distance product of 6400 Gb/s km is successfully achieved by the secure transmission of a 32 Gb/s on-off-keying modulated confidential signal over a 200 km optical fiber link. The demonstrated scheme is fully compatible with conventional optical transmission systems and can be operated in a pluggable manner, which may pave a new path to ultra-high-speed physical-layer secure optical communication in the future.
To guarantee information security from the lowest level of optical networks, it is essential to provide physical layer security in fiber-optic communication systems. However, it is challenging to realize high speed physical secure optical communication based on advanced optical modulation formats and pure commercial hardware components. In this work, we report an experimental demonstration of a high-speed 56 Gb/s PAM4 physical-layer secure optical communication system by employing an electro-optic self-feedback hardware module for temporal self-phase encryption and decryption without consuming any additional encryption channel. An encrypted 56 Gb/s PAM4 confidential signal is successfully decrypted after transmitting over 60 km single-mode fiber. The demonstrated scheme can not only be integrated with existing optical communication networks, but can also be used as a pluggable module, which may provide a promising solution for ultra-high speed physical secure optical communication by combining with advanced multiplexing technology in future.
Ensuring high speed physical layer confidential data exchange in classical optical fiber channels is a critical challenge. In this letter, we experimentally demonstrated a physical secure optical communication system based on temporal spreading-then-random phase encryption scheme for secure transmission of 25 Gb/s intensity-modulated signal. Commercial low cost continuous-wave laser is employed as the optical source, and a chirped fiber Bragg grating followed by a phase modulator is utilized as a two-dimensional encryption module. Successful encryption and decryption of 25 Gb/s confidential data have been achieved by optimizing optical hardware parameters. The demonstrated system can combine the advantages of hardware and digital encryption, exhibiting great potential for providing physical layer security in future high-speed secure optical communication systems.
Abstract In this paper, a novel secure communication scheme based on temporal spreading and dual-phase perturbation is proposed to improve security at the physical layer. For one thing, the traditional electro-optical feedback phase encryption system is significantly sophisticated by the introduction of additional synchronized chaotic phase encryption. Besides, more keys in this system are available, with the attendance of dispersion and optical chaos, the key space is notably enhanced to ∼2 36 , resisting the eavesdropping attacks. After passing through a series of encryption devices, the information is ultimately displayed as a noise-like signal. A 32 Gb s −1 on-off keying signal is successfully transmitted over a 100 km standard single-mode fiber. Simulation results show that by selecting the appropriate system parameters, a bit error rate as low as 10 −10 can be obtained for legitimate terminals, and the effect of different hardware parameter mismatches on the decryption performance is also investigated which indicates a certain tolerance range for the mismatch of each parameter. This paper provides a new idea to combine an electro-optical feedback system with optical chaos to establish optical secrecy communication.
Abstract We propose and numerically demonstrate a novel high-speed physical layer secure optical communication system based on a dual-path mutual feedback phase encryption scheme, which comprises two coupled electro-optic phase modulation feedback branches. The proposed scheme is able to randomly scramble the phase of a confidential message without any additional encryption signal and eliminate the time delay signature (TDS) that exists in a conventional electro-optic phase feedback loop. The TDS concealment is accomplished by the nonlinear transformation produced by the dual-path mutual feedback optical phase encryptor. As a proof-of-principle demonstration, a 32 Gbps differential phase shift keying signal is encrypted and secretly transmitted over a span of 330 km standard single-mode fiber with a bit error rate lower than the hard-decision forward-error correction threshold. Both the sensitive delay time and dispersion values in the feedback loop are employed as hardware keys to guarantee system security. It is envisioned that the proposed scheme may provide an attractive approach for future hardware encryption based high-speed secure optical communication.
In the current context of information explosion, securing the physical layer in the backbone networks of coherent optical communication is vitally important. In this letter, we experimentally validate a secure communication scheme for coherent optical communication systems based on electro-optic phase feedback encryption, thereby successfully transmitting a 40 Gb/s dual-polarization quadrature phase shift keying (DP-QPSK) signal over a distance of 180 km. By strategically incorporating a delay line interferometer and a dispersion component within the electro-optic feedback loop, it is possible to generate random phase scrambling at a moderate modulation depth. With the utilization of commercial hardware, the encryption of DP-QPSK signals can be seamlessly accomplished in a plug-and-play manner, removing the necessity for additional synchronization or key distribution systems. The proposed scheme paves a new way to protect the polarization-multiplexing signals and offers a promising approach for secure coherent optical communication system.