Optimization Of Chaotic Performance And Generation Of Tunable Mid-infared Laser Based On Silicon Waveguide

Silicon materials have abundant optical nonlinear effects,including fourwave mixing effect,self-phase modulation effect,cross-phase modulation effect and stimulated Raman scattering effect,and is widely used in the wavelength conversion,super continuous spectrum generation and silicon Raman laser.At the same time,due to the compatibility between silicon devices and CMOS process,there have the advantages of high integration,small size,low cost and simple process on silicon devices.As a basic silicon functional device,silicon waveguide also has abundant nonlinear effects.The nonlinear strength of the silicon waveguide can be further improved by doping in the silicon waveguide with ion implantation.The in-depth study of the nonlinear effect and application of silicon waveguide is of great significance for the further expansion of the exploration direction and application field of the silicon-based waveguide nonlinear devices.In this paper,the nonlinear effects in silicon waveguide are introduced,and the inhibition of the nonlinear effect on the time-delay suppression and bandwidth broadening of chaotic signals is analyzed by numerical simulation.Furthermore,the theoretical model of doped silicon waveguide is established to analyze the nonlinear effect on wavelength conversion.The research contents of this paper mainly include:First,based on the Lang-Kobayashi(L-K)rate equation and the non-linear Schrodinger equation,a theoretical model of the nonlinear effect of the silicon waveguide on chaotic laser performance is established.Further,the internal parameters of the silicon waveguide are analyzed,including the nonlinear coefficient ,the group velocity dispersion coefficient ,the linear loss coefficient ? and the two-photon absorption loss ?TPA,as well as external conditions,such as the waveguide length L and the power of the chaotic signal injected into the silicon waveguide.The effect of signal bandwidth and delay characteristics suppression.The bandwidth enhancement and delay suppression of chaotic laser are realized under the appropriate conditions.Second,Based on the degenerate four-wave mixing effect,a simulation model of doped silicon waveguide to achieve tunable infrared laser generation is established.By studying the doping particle dose,the length of the doped region,and the effect of the change in the size of the doped particle on the optical pulse spectrum,the following conclusions are obtained: with the doping concentration variations can achieve output of tunable wavelengths.When the doped particle density changes from 0 to 100 / ?m,the tunable wavelength conversion from the communication wavelength(1.55 ?m)to the mid-infrared region is achieved.The wavelength tuning range reaches 225 nm,and the maximum conversion wavelength is 2.85 ?m.