摘要
从非线性薛定谔方程出发,采用分步傅立叶分析方法数值模拟光子晶体光纤中超连续谱的产生,计算、模拟并分析初始啁啾在光子晶体光纤的零色散点对超连续谱演变和带宽的影响。结果表明,非线性作用使频谱分裂成多峰不对称的结构,初始啁啾C的引入能明显的改善超连续谱的带宽和平坦性。由于二阶色散β2=0,三阶色散β3对超连续光谱的展宽影响较大。当β3>0时,C取正值时,随着C的增大,带宽减小;C取负值时,带宽有所增大,平坦性也有改善;β3<0时,无论C取正取负,频谱带宽增大,且平坦性较好。
The generation of supercontinuum（SC） in photonic crystal fiber（PCF） is simulated with the split- step Fourier method according to the Schrodinger equation, and the influence of initial chirp C on the evolution and bandwidth of SC at the zero dispersion wavelength of PCF are analyzed. The numerical results show that the nonlinear effects split .the frequency spectrum into multiple-peaks and dissymmetric configurations, and the bandwidth and the flatness of SC can be improved by the initial chirp. The third-order dispertion β3 has greater impacti on the SC because β2=0. For β3〉0, when C〉0, the bandwidth is reduced with the increase of C, and when C〈 0, the bandwidth is increased and the spectrum flatness is improved. For β3 〈0, no matter what C is positive or negative, the spectrum bandwidth is increased and the spectrum flatness is improved.
出处
《中国海洋大学学报（自然科学版）》
CAS
CSCD
北大核心
2008年第6期1021-1024,共4页
Periodical of Ocean University of China
关键词
超连续谱
光子晶体光纤
初始啁啾
零色散点
supercontinuum
photonic crystal fiber
initial chirp
zero-dispersion wavelength
