Design Of Distributed Optical Switching System Based On ZYNQ

With the advent of the Internet 5G era,data center needs to continuously improve its ability to centrally process large-volume services.Network architecture and implementation method need to be updated and optimized to improve their transmission rate,transmission bandwidth,and transmission delay.This article introduces the distributed optical switching system based on ZYNQ technology,and develops a complete development from the upper computer software to the embedded device.The whole system adopts an expandable distributed optical network topology to realize all-optical switching,combined with 25 G tunable optical modules and cyclic arrayed waveguide grating routers to apply business switching based on seconds or hundreds of milliseconds.The main research contents are as follows:(1)Designed and produced a whole distributed optical switching system based on tunable optical modules and cyclic arrayed waveguide grating routers.It can automatically perceive the global wavelength status during deployment,perform intelligent wavelength configuration,and automatically bundle wavelength transmission according to node traffic requirements,and each port can feedback unconnected information(fiber break or plug-in/out module).The system has five nodes,and each node has 16 network ports and can be expanded to 32 ports to achieve up to 800 G high-speed service transmission and reception.Combining the top adjustment service to achieve interconnection between nodes to build a reflection path,to achieve flexible expansion and wavelength reconstruction of the network architecture.(2)Compared with the traditional switch using MCU and FPGA external interconnection,this system uses ZYNQ as the main control,dual-core ARM Cortex-A9 processing system as the core,FPGA programmable logic as peripherals,and makes full use of the features of fully programmable So C to realize the collaborative work between software and hardware.The switch adopts parallel data processing,and the overall exchange performance is increased by 16 times to achieve task exchange within 1ms.The data exchange bandwidth of PL and PS can reach up to Gbit/s,which is much higher than the data bandwidth of external PCIE bus interconnection.(3)The embedded hardware including the system board-level hardware circuit and the IP core is designed by using Verilog HDL language.It can realize the design of board-level circuits such as power supply,network port,DDR,25 G high-speed signal,control system peripheral configuration.It also can design the IP core which is to realize the Manchester decoding,interrupt control logic,and system synchronization trigger control.Designed embedded software development based on Free RTOS real-time operating system.It used C language upward to complete the command frame data interaction with the top-level application through the TCP/IP network protocol,and downward through the internal AXI bus to complete the top adjustment signal data interaction with the logic end.Designed the prototype development of embedded switching equipment.