【摘要】 为探究硅基纳米波导中自由载流子吸收效应对皮秒脉冲整形的影响,采用改进的分步傅立叶法和四阶龙格库塔法,分析了脉冲峰值功率、脉冲宽度等参数对波导中自由载流子吸收系数和脉冲波形演变的影响,并对不同峰值功率下脉宽为100ps脉冲的波形演变进行了数值模拟。数值模拟表明,脉冲宽度不变时,峰值功率越大,波导中载流子吸收系数变化越快,脉冲波形演变也越明显;当脉冲峰值功率为50W时,在短短6mm的传输距离中,脉冲经历了快速展宽和压缩过程,其脉冲宽度最大为,展宽比为44%;最小为,脉冲压缩比达36.1%。更多还原

【Abstract】 To explore the effect of free carrier absorption(FCA) on pico-second pulse shaping in silicon nanometer waveguide, the combination of improved step-split Fourier and four-order Runge Kutta method is adopted. The influences of peak power and width of pulse upon the FCA and pulse waveform evolution are analyzed, and the pulse waveform evolution of 100 Ps pulse with different peak powers is simulated numerically. The numerical simulations show that, when the pulse width unchanged, the more the peak power is, the more quickly the FCA coefficient changes, and the more strongly the pulse evolutes. When the pulse peak power is 50 W, in a 6mm short transmission distance, pulse has experienced rapid broadening and compression process. The maximum pulse broadening and compression are found to be 1.44T0 pand 0.6392T0 p, the corresponding broadening and compression rates are 44% and 36.1% respectively.更多还原