Wavelength Assignment And Switching Technology Supporting Co-Fiber-Transmission Of Quantum And Classical Signals

With the rapid development of computer technology, the encryption systems based on the computational’complexity are facing severe challenges. Meanwhile, the modern society has given more and more priority to the information security. There are certain fields that demand higher of information security, such as national defense, military and finance, they are in badly need of an encryption system which can provide adequate safety. The information of quantum communication take some characters of the photon as the carriers, this technology is supported by the foundation of quantum mechanics, making sure that any eavesdropping can be detected if it happens. We call this feature as unconditional security, and quantum communication has become a research hotspot for the security.Since the quantum signal is composed of single photon, the signal intensity is pretty weak, thus the transmission and switching in the network should be different from the classic signal. Although the quantum communication technology has made a lot of achievements, it cannot satisfy the need of practical quantum communication network. At present, the quantum key distribution network model existing are built on the base of classical optical network, so we focus on the combination of quantum signal and classic signal in the same fiber. This paper comes up with a method of channel resource assignment after the research of its feasibility, and also proves its effectiveness. After that this paper proposes a model of quantum switching nodes, which can be used with the assignment method mentioned above, and they can indeed contribute to the communication efficiency.This paper also introduces the point-to-point quantum key distribution system for function verification, including its structure and working principle. Then we design some experiments on the system. The proposal in this paper can also be verified by certain experiment. Despite of the progress achieved in the quantum communication field, there are still exist some problem to be settled, this paper prospected the future of the quantum communication.