基于QD-SOA级联XGM与XPM全光逻辑或门的研究

QD-SOA Cascaded XGM and XPM All-Optical Logic OR Gate

为了提高全光逻辑门性能,对基于量子点半导体光放大器(Quantum Dot Semiconductor Optical Amplifier,QD-SOA)提出了一种级联XGM与XPM全光逻辑或门的设计方法。在QDSOA三能级模型的基础上,将QD-SOA细化分段,使用牛顿迭代法和四阶龙格-库塔法求解速率方程,对这种全光逻辑或门进行仿真分析。计算结果表明:增大电流强度和有源区宽度,减小最大模式增益和损耗系数,可以提高对比度、Q因子、消光比和转换效率;增大泵浦光功率可以提高消光比和对比度,但是会减小Q因子和转换效率。当泵浦光功率为10 dB、最大模式增益为2500 m^-1、电流强度为60 mA、有源区宽度为2.0μm以及损耗系数为3.2时,全光逻辑或门具有较好的性能。因此,为了提高全光逻辑门的性能,必须优化并选取合适的参数,这对全光逻辑门性能具有一定的指导意义。

In order to improve the performance of all optical logic gates,a design method of cascaded XGM and XPM all-optical logic OR gate based on QD-SOA(quantum dot semiconductor optical amplifier)is proposed.On the basis of QD-SOA three-level model,the QD-SOA is refined into segments,and the rate equation is solved by Newton iteration method and fourth-order Runge-Kutta method.Simulation analysis and calculation of the all-optical logic OR gate indicate that the contrast ratio,Q factor,extinction ratio and conversion efficiency can be improved by increasing current intensity and active region width and decreasing maximum mode gain and loss coefficient,while the extinction ratio and contrast ratio can be improved by increasing pump power,but Q factor and conversion efficiency would be reduced.When the pump power is 10 dB,the maximum mode gain is 2500 m^-1,the current intensity is 60 mA,the active region width is 2.0μm and the loss coefficient is 3.2,the all-optical logic OR gate has better performance.Therefore,in order to improve the performance of all-optical logic gates,appropriate parameters must be selected and optimized,and all this has certain guiding significance for the performance of all-optical logic gates.