摘要
采用自适应分步傅里叶法求解包含自发拉曼散射噪声的广义非线性薛定谔方程，通过改变抽运脉冲的脉冲宽度和中心波长，利用单光子随机噪声模型，从光谱的频域演化相干度和相位角演化方面，理论研究了噪声对光子晶体光纤产生超连续谱的相干性影响。结果表明，要获得高相干度的超连续谱光源，孤子裂变的距离必须小于调制不稳定性距离，以抑制调制不稳定性对噪声的放大。因此，采用较短的抽运脉冲、抽运脉冲在正常色散区或在反常色散区距离零色散波长较远，二阶色散系数绝对值较大，可以获得高相干度的超连续谱光源。
Based on single-photon noise model and generalized nonlinear Schrodinger equation including spontaneous Raman scattering noise, the coherence properties of supercontinuum under various pulse widths of the pump pulse and input pulse wavelength are theoretically analyzed from the coherence and phase angle evolution of spectra in the frequency domain. The results show that, in order to obtain a high degree of coherence supercontinuum light source and suppress the modulation instability to noise amplification, the soliton fission of distance must be smaller than the modulation instabilities distance. Using shorter pump pulse, the pump pulses in the normal dispersion region or in the region of anomalous dispersion far from zero-dispersion wavelength, the absolute value of the second-order dispersion coefficient is added to obtain highly coherent supercontinuum.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2013年第F06期252-257,共6页
Acta Optica Sinica
基金
国家自然科学基金（60978028）、北京市教育委员会项目（Km200910005019）、北京市教委科研计划重点项目（Kz201110005010）、山东省自然科学基金（R2009AL013）和山东省教育厅科技计划（J08L114）资助课题.
关键词
非线性光学
相干特性
自适应分步傅里叶法
调制不稳定性
nonlinear optics
coherence properties
adaptive step Fourier method
modulation instability
