Optical Network Switching Technology Based On Quantum Key

With the rapid increasing of computer operation ability and constant research on quantum computer, the traditional cryptography now is facing the formidable challenge of being cracked more and more easily. Quantum cryptography is a combination of cryptography and quantum mechanics. By using the secure key distribution, combined with the method of "one time pad" encryption, absolutely secure communication can be achieved. As the security properties of quantum cryptography, it will be the next generation of secure communication technology. At present, the point-to-point quantum key distribution scheme is already mature, how to solve the primary task of classical optical network and quantum key distribution network convergence problem is to select the appropriate transmission schemes for quantum signal, the core task is to design of function and structure of switched nodes.As the characteristic of quantum signal, the quantum signal is very weak and can’t be cloned, we analyzed the influence of nonlinear effects in quantum signal and classical optical signal co-fiber transmission, and simulated the process of quantum signal and the classical optical signal co-fiber transmission, we also proposed a co-fiber transmission wavelength channel allocation strategy to reduce the nonlinear effect. Based on the distribution strategy, we analyzed the quantum switching node structure for DWDM system, and proposed a quantum switching node structure which can support both the classical signal and quantum signal.On the realization of quantum key distribution network platform, we realized a promotion of key distribution rate and stability of quantum key distribution network platform. In the promotion of quantum key distribution rate, we used USB instead of serial communication, and used1phase scanning with multiple key distribution process, the quantum key generation rate was promoted to the average of400bps; in the promotion of stability, we used cyclic software process control, which can help implement a long-term stable quantum key distribution system.