Physical secure key distribution based on chaotic self-carrier phase modulation and time-delayed shift keying of synchronized optical chaos

Author:

Gao Zhensen1ORCID,Ma Ziyang1,Wu Sile1,Gao Hua2,Wang Anbang2,Fu Songnian1ORCID,Li Zhaohui3,Qin Yuwen1ORCID,Wang Yuncai1

Affiliation:

1. Guangdong University of Technology

2. Taiyuan University of Technology

3. Sun Yat-sen University

Abstract

High speed physical secure key distribution in a classical optical fiber channel is unprecedentedly desired for modern secure communication, but it still remains a worldwide technical challenge. In this paper, we propose and experimentally demonstrate a novel high-speed physical secure key distribution scheme based on chaotic optical signal processing and private hardware modules, which employs chaotic self-carrier phase modulation for chaotic bandwidth expansion and time-delayed shift keying of commonly driven synchronized optical chaos for physical layer security. In this scheme, the entropy source rate of synchronized chaos output from two remote response lasers is greatly expanded by chaotic self-carrier delayed nonlinear phase disturbance, which facilitates high speed key extraction from the entropy source with guaranteed randomness. Moreover, a synchronization recovery time of sub-nanosecond is achieved by dynamic keying of the chaotic delay time after chaos synchronization to accelerate the key distribution rate. Based on the proposed scheme, a high physical key distribution rate of 2.1 Gb/s over 40 km is successfully demonstrated in the experiment. The proposed solution provides a promising strategy for future high-speed key distribution based on chaotic optical signal processing and classical fiber channel.

Funder

National Key Research and Development Program of China

National Natural Science Foundation of China

Basic and applied basic research project of Guangzhou basic research program

Guangdong Introducing Innovative and Enterpreneurial Teams of “The Pearl River Talent Recruitment Program”

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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