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利用耦合非线性薛定谔方程组(CNLSEs),研究了超短孤子脉冲在非线性三芯光纤耦合器中的传输和开关特性。分析了正常色散和反常色散对于开关特性的影响。通过调整非线性参数能够优化开关特性,降低了开关阈值功率和提高了能量转移效率。采用分步傅里叶法(SSFM)的仿真,数值模拟了在正常色散区和反常色散区的不同开关特性,以及当非线性参数从1.5增大到2.5时开关性能的变化。研究表明:在反常色散区中,耦合器具有明显的开关特性。在三芯耦合器中,当三根光纤的非线性参数同时增加时,阈值功率由Po12显著降低至Po4.12,能量转移效率由40%显著提升至65%。
The coupling and non-linear Schrödinger equations (CNLSEs) were used to study the transmission and switching characteristics of ultrashort soliton impulses in a nonlinear three-core fiber coupler. The influence of normal dispersion and anomalous dispersion on the switching characteristics is analyzed. By adjusting the non-linear parameters, the switching characteristics can be optimized, the switching threshold power is reduced and the energy transfer efficiency is improved. Using the simulation of the fractional Fourier transform (SSFM), different switching characteristics were simulated numerically in the normal and anomalous dispersion regions, and the switching performance was changed when the nonlinear parameter was increased from 1.5 to 2.5. The research shows that the coupler has obvious switching characteristics in the anomalous dispersion region. In the three-core coupler, the threshold power decreases significantly from Po 12 to Po 4.12 when the nonlinear parameters of three fibers increase at the same time, and the energy transfer efficiency increases significantly from 40% to 65%.