Research On Broadband And Scalable Microwave Photonic Switching Techniques

Switching systems is one of the most used subsystems of communication systems,they are used to switch different input signals to designated output ports.The inevitable trend of developing future switching systems is high-frequency,broadband,scalable,flexible and light-weight.But at present,switching systems is mostly implemented using RF switch matrixes,which have shortcomings in terms of frequency,isolation,size and scalability,and can not meet the increasing demands for switching.Therefore,building a high-performance,flexible switching system is of great importance to the development of communication techniques.In this paper,a new broadband and scalable microwave photonic switching system based on microwave photonic switching techniques is proposed.The proposed system has advantages of high-frequency,broadband and scalable,which can meet the development needs of future switching systems.The proposed system is made up of one main module and many extension modules.The main module and extension modules are independent and connected by some optical input and output interfaces.When the switching demand increases,only the number of extension modules in the system needs to be increased,while the structure of the rest of the system does not change,thus the system can really achieve scalable.In this paper,the feasibility of the proposed system is analyzed theoretically.Some simullations and experiments are carried out to test the link performance of the proposed system with link gain,SFDR,crosstalk,NF and EVM.The simulation results show that the link gain is greater than-43dB and the SFDR is greater than 103dB·Hz2/3.The experimental results show that the link gain is greater than-44dB,the SFDR is greater than 96dB-Hz2/3,the EVM is less than 3%and the crosstalk is less than 80dB.All the results show that the system has good link performance.