Adaptive Power Control Scheme for Noise Suppressing in Quantum-Secured Distribution Communication Networks

To provide a future-proof security solution, we investigate the integration of quantum key distribution (QKD) with distribution communication networks and propose a QKD over TWDM-PON scheme. Some former researches reduced the launch power of classical signals to the level of error-free transmission to mitigate the noise impairments on QKD. However, this sacrifices the transmission reliability of classical signals and is not suitable for distribution communication networks whose reliability influences the distribution grid operation. In this paper, we propose an adaptive power control (APC) scheme, in which the launch power is dynamically optimized by considering different data rate of data traffics and the balance of generating and consuming key resources in quantum key pool. Simulation results verify that APC scheme can obtain a good trade-off between the secure key providing and the reliability of classical signal transmission.