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基于耦合非线性薛定谔方程(CNLSEs),利用分裂步长傅里叶方法(SSFM),研究了超短光脉冲在有源三芯非线性光纤耦合器中的传输和开关特性。重点分析了在一阶色散耦合系数和二阶色散耦合系数的影响下,线性增益系数和有限增益带宽对脉冲传输和开关特性的影响。研究表明,线性增益系数能增大开关陡峭性、降低开关临界能量、提高开关效率;虽然有限增益带宽使耦合器开关特性变差,但是它不仅能显著抑制由线性增益系数引起的脉冲压缩和放大,而且还能有效抑制由一阶色散耦合系数引起的脉冲展宽和分离以及由二阶色散耦合系数引起脉冲高频振荡,使光脉冲在三纤芯间呈现出类似无源光纤耦合器那样的周期性耦合传输特性。
Based on the coupled nonlinear Schr 谔 dinger equations (CNLSEs), the propagation and switching characteristics of ultrashort optical pulses in an active three-core nonlinear optical fiber coupler were studied by the split-step Fourier method (SSFM). The influence of the linear gain coefficient and the finite gain bandwidth on the pulse transmission and switching characteristics are mainly analyzed under the influence of the first-order dispersion coupling coefficient and the second-order dispersion coupling coefficient. The research shows that the linear gain coefficient can increase the switching steepness, reduce the critical energy of switching and improve the switching efficiency. Although the limited gain bandwidth deteriorates the switching characteristics of the coupler, it not only significantly suppresses the pulse compression and amplification caused by the linear gain coefficient , But also effectively suppress the pulse broadening and separation caused by the first-order dispersion coupling coefficient and the pulsed high-frequency oscillation caused by the second-order dispersion coupling coefficient so that the optical pulse exhibits a period similar to the passive fiber coupler between the three cores Sexual coupling transmission characteristics.