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Quantum cryptography uses the basic principles of quantum physics to ensure the security of information transmission. In theory, it has unconditional security and can provide new technical guarantees for information security in various fields of society. In order to save the cost of deploying the QKD network, the QKD network can be combined with the existing classical communication network, so that the quantum signal and the classical signal can be transmitted through the same fiber. However, there are still many key technical problems in the fusion network of quantum communication and classical communication. This paper proposes a technique of classical-quantum signals simultaneous transmission sharing a same fiber based on mode division multiplexing. This scheme improves the problem that a large mode gain difference between different modes caused by EDFA and leads to a decrease in the transmission capacity of the system in the existing long distance mode division multiplexing transmission system.
Cong Chen,Min Hu, andBanghong Guo
"Classical-quantum signals simultaneous transmission sharing a same fiber based on mode division multiplexing", Proc. SPIE 11763, Seventh Symposium on Novel Photoelectronic Detection Technology and Applications, 117637W (12 March 2021); https://doi.org/10.1117/12.2587491
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Cong Chen, Min Hu, Banghong Guo, "Classical-quantum signals simultaneous transmission sharing a same fiber based on mode division multiplexing," Proc. SPIE 11763, Seventh Symposium on Novel Photoelectronic Detection Technology and Applications, 117637W (12 March 2021); https://doi.org/10.1117/12.2587491