Abstract
With the continuous development of 5G technology, the security of signal transmission in this digital era has attracted more attention. Quantum Key Distribution (QKD) technology takes quantum mechanics as the theoretical support, which provides a reliable security guarantee for 5G optical network. This paper proposes a 5G fronthaul optical network architecture based on QKD security to ensure the security of 5G fronthaul optical network. The spontaneous Raman scattering noise on the quantum channel caused by the bidirectional classical signal is analyzed. The impact of the bidirectional noise on the performance of the QKD system is studied. Finally, the performance of QKD in the proposed architecture is evaluated by simulation. It is found that the backward Raman noise is greater than the forward Raman noise. The Secure Key Rate (SKR) decreases with the increase of transmission distance. Small QKD detection gate width and high QKD detection efficiency are conducive to SKR.
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