Experimental Realization Of Multi- Granularity Optic Al Network Switch Node Supporting Quantum Key

Quantum Key Distribution (QKD) technology, based on the Heisenberg uncertainty principle, quantum uncertainty principle and no-cloning theorem, can achieve unconditionally secure communication.At present, most of QKD Systems are point-to-point or fixed routing,which is difficult to meet the demand of large quantum dynamic communication between users. The classical optical network develops fast in multi-granularity switch and elasticity of resource management, but for the reason of the particularity of quantum signal,switch node architecture in classical optical network is not suitable for QKD network.This paper focuses on the architecture of QKD switch network and the integration of QKD network and classical optical network. By researching the advanced scientific research achievements in this field and learning of theoretical knowledge, the following four innovations are obtained.A flexible multi-granularity optical switching node architecture and the routing principle are proposed. In this paper, the characteristics of the quantum signal and the working mode of the quantum signal and the classical signal co-propagating in the same fiber are fully considered, and proposed a multi-granularity switching node architecture, which can support quantum signals and classical signals switching in the same node,The quantum switching node we proposed is divided into three levels:optical fiber, waveband and wavelength. And it can reduce the port size of OXC and expand the switching capacity.Wavelength selected switching devices are introduced into the quantum switching node, making the switching node more flexible and more intelligent. In order to ensure the quantum signals keeping pace with the synchronization signals, WSS devices are introduced in the waveband-level, which greatly increasing the flexibility and intelligence of the node structure.The crosstalk and network loss in the quantum switching network are analyzed. In this paper, based on the bit error rate and the key generation rate, we simulated the crosstalk and link attenuation and analyzed the requirement of the loss isolation in the quantum switching node.The multi-granularity quantum switching prototype was realized, and based on the switching node we built a quantum key distribution experiment system. In this paper, we completed the multi-granularity quantum switching prototype from hardware, signaling, software design.Besides, we carried on related elaborate on the difficulty in the design process. Finally, we establish a QKD experimental system, and test the performance of the prototype.