Simulation And Optimization Of Wavelength Selective Switch Based On Zemax

The wavelength selective switch is one of the core devices in the new generation reconfigurable optical add multiplexing.The WSS Based on Liquid Crystal on Silicon have significant advantages such as high spectral flexibility,low insertion loss,and strong signal processing capabilities.The wavelength selective switches of Liquid Crystal on Silicon have been the main direction of international WSS technology development in recent years.The current commercial WSS is mainly provided by a few foreign companies such as Finisar.The number of ports is generally less than 1 X 20.The number of ports of mainstream products is 19 and the spectral resolution is 10GHz.The development of WSS with high port number and high spectral resolution can effectively reduce the number of WSS required in ROADM optical nodes,thereby significantly reducing the construction cost,energy consumption,failure rate and operation and maintenance costs of ROADM optical networks,making the optical network full Optical signal processing capacity and network switching capacity have been greatly improved,while effectively reducing China's trade risk in the field of next-generation optical communications technology,which has important research significance and practical application value.In this thesis,using ZEMAX optical design software,through the optimization of the optical components such as the Fourier lens group and the cylindrical lens group inside the WSS optical system of the silicon-based liquid crystal and the imaging system,the 112 ports wavelength selection switch ZEMAX simulation model is established,and setting the merit function to optimize the spot quality improves the image quality and wavelength resolution on liquid crystal on silicon(LCoS).The main work completed by the paper includes:(1)The basic structure and working principle of the wavelength selective switch are discussed.The fiber microlens array,the Fourier lens group,the transmission grating(multiplexing/demultiplexer),and the liquid crystal on silicon chip(since ZEMAX has no related functions,in the simulation,the mirror is used instead,which does not affect the accuracy of the simulation result)The main optical components that constitute the WSS are analyzed.At the same time,the main optical principle of the WSS is analyzed.(2)A relatively complete wavelength selection switch ZEMAX optical simulation system is established.Model building and parameter setting of the components of the wavelength selective switch in ZEMAX.By setting the multiple configuration of the mirror,the simulation of the multi-port output of the wavelength selective switch is realized.(3)Using the established ZEMAX optical simulation system,iteratively optimizes the Fourier lens group and imaging optical system inside the wavelength selective switch,and obtains the simulation results of the 1 X 112 port wavelength selective switch(WSS).At the same time,by optimizing the cylindrical lens,a finer spot is obtained on the liquid crystal on silicon(LCoS),the spot size is compressed to 25?m,and the spectral resolution is 6.25GHz in the 1530nm-1560nm band.(4)A preliminary WSS experimental system was built,and the overall insertion loss of the C band was 5.4dB-6dB.The results of this paper provide the necessary theoretical analysis method and optimal design basis for further experimental research on WSS with high port number and high wavelength resolution.