摘要
以三、四阶色散项的耦合非线性薛定谔方程为基础,考虑光纤损耗及高阶色散,研究了双光束在零色散附近的交叉相位调制不稳定性.理论上导出描述交叉相位调制不稳定性的色散方程,并进行数值模拟计算.结果表明:由于四阶色散的影响,在光纤的正常、反常色散区,交叉相位调制不稳定性均发生在两个频谱区.如光脉冲工作在最小群速度色散附近时,四阶色散对光纤的交叉相位调制不稳定性将起决定性作用,可使增益谱出现一个新的峰值.光纤损耗使增益的谱宽变窄.对给定的传输距离,随着光纤向零色散附近靠近,两个频谱区谱宽增加直到相互重叠.数值分析了两光波有差别时的交叉相位调制不稳定性.
Cross-phase modulational instability created by two beams of lights in the region of minimum group-velocity dispersion is investigated based on extended nonlinear Schrdinger equation with the fiber loss and high-order dispersion considered. The dispersion equation which describes the cross-phase modulational instability is obtained,and the numerical simulation is done. It is shown that because of the fourth-order dispersion, cross-phase modulational instability occurs at two spectrum regions in both anomalous and normal dispersion regimes of fiber. When second-order dispersion approaches the minimum value at the so-called zero dispersion wavelength, fourth-order dispersion dominates the cross-phase modulational instability and makes a new crest in the gain spectrum. Research also shows that fiber loss reduces the frequency range of the gain spectrum. For a given dispreading distance, the widths of the two spectrum regions increase until overlay when second-order dispersion approaches zero. When two beams of lights have difference, the cross-phase modulational instability is analyzed numerically.
出处
《光子学报》
EI
CAS
CSCD
北大核心
2006年第9期1367-1373,共7页
Acta Photonica Sinica
基金
南京林业大学科技创新基金(163070019)资助
关键词
交叉相位调制不稳定性
四阶色散
光纤损耗
Cross-phase modulational instability
Fourth-order dispersion
Fiber loss
