Research On Simulation Technology Of Wavelength Selective Switch Based On VirtualLab

The wavelength selective switch(WSS)is one of the core optical devices in the new generation of reconfigurable optical add-drop multiplexing(ROADM)all-optical network.Wavelength-selecti-ve switches based on liquid crystal on silicon(LCoS)have wavelength-independent,direction-independent,non-competitive,grid-free(CDCG)and rich all-optical signal processing functions,becoming the main direction of the development of wavelength selective switch technology.At present,the number of ports for mainstream WSS products is only 1× 9 ports.By improving the design of the optical system and optimizing its internal optical components,designing and developing a liquid crystal on silicon WSS with a high port count is important for further reducing the construction and operation and maintenance costs of ROADM optical networks,improving network performance and its all-optical switching capabilities It has important research significance and practical value.In this paper,for the design of a WSS optical system based on fiber microlens array and liquid crystal on silicon,a wavelength selective switch simulation model based on VirtualLab optical simulation software is established,and the beam transmission and port interpolation in the 1 × 76 port wavelength selective switch are established.Loss and other key factors were studied by numerical simulation,and a preliminary experimental system was built.The main work completed by the thesis are as follows:1.The design of the overall optical system,the main optical components involved and the basic working principle of the wavelength selective switch based on fiber microlens array and liquid crystal on silicon are discussed in detail.2.The simulation model of wavelength selective switch based on VirtualLab optical simulation software is established.By appropriately setting the simulation parameters of the main optical components in the system such as microlens array,Fourier transform lens,cylindrical lens,etc.,the microlenses are simulated more accurately.The incident Gaussian beam of the array passes through the collimating lens and the cylindrical lens,is redirected by the silicon-based liquid crystal,and then returns to the entire beam control and transmission evolution process of the output microlens array port.The simulation results are basically consistent with the experimental results.3.On the basis of the above work,the high-port-number wavelength-selective switch based on fiber microlens array and liquid crystal on silicon was carried out,and the numerical simulation based on VirtualLab was carried out at three wavelengths of 1530nm,1545nm and 1560nm.The research results show that in the C-band,this structure design can realize the wavelength selective switch function of 1 × 76 ports,and the insertion loss between ports caused by the spot mismatch is in the range of 3.0?9.5dB.The spot size of 39.28m width can be obtained on the liquid crystal on silicon,and the corresponding spectral resolution of WSS is 9.8GHz.4.On the basis of the above simulation results,a preliminary WSS experimental system based on 4K liquid crystal on silicon and 1200 line transmission phase diffraction grating was built and tested.