Real-time stealth optical transmission via fast laser frequency dithering

Author:

Wang Yuanxiang,Ao Xueyuan1,Zhong Linsheng1ORCID,Zhao Ruiyan2,Ma Jianjun2,Dai Xiaoxiao13ORCID,Yang Qi13,Deng Lei13ORCID,Liu Deming13,Cheng Mengfan13ORCID

Affiliation:

1. School of Optical and Electronic Information, Huazhong University of Science and Technology

2. Wuhan Bianfu Optoelectronic Technology

3. Jinyinhu Laboratory

Abstract

We report a real-time 150 kbps stealth transmission within public optical communication of 10 Gbps dual polarization QPSK. The stealth data is modulated onto the frequency tuning signals of a fast-tuning laser source in the transmitter, which causes slight frequency dithering for the transmitted optical signal. In the receiver, the stealth receiver recovers the stealth data from the estimated frequency offset by the QPSK DSP algorithm. The experiments show the stealth transmission has few impacts on the public channel over a 300 km distance. The proposed method is fully compatible with existing optical transmission systems, and the only hardware change is to upgrade the transmitter laser to support frequency tuning through an external analog port for receiving stealth signal. The proposed stealth scheme can combine with cryptographic protocols to improve the integrated security of the system, and can be used as signaling transport for low level network control to reduce the communication overhead.

Funder

National Key Research and Development Program of China

National Natural Science Foundation of China

Key Research and Development Program of Hubei province

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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