【作者】 夏兰叶； 谢栋； 文建国； 文双春；

【Author】 Lanye Xia Dong Xie Jianguo Wen Shuangchun Wen (School of computer dan communication,Hunan University,Changsha,Hunan 410082,China)

【机构】 湖南大学计算机与通信学院；

【摘要】 本文采用微结构硫化物光纤,以非线性薛定谔方程为理论模型,利用分步傅里叶计算方法,研究输入脉冲的中心频率和脉宽对中红外超连续谱的影响。本文采用的微结构硫化物光纤具有较高的非线性效应和两个零色散波长,且第二个零色散波在中红外波段,有利于中红外超连续谱的产生。通过仿真发现,输入脉冲的中心频率和脉宽对连续谱的产生都有很大的影响。数值仿真中,输入具有不同频率和脉宽的脉冲,观察并比较模拟结果发现,输入波长接近零色散点时较远离色散点时产生的中红外超连续谱要宽,而且,在保持峰值功率不变的情况下,脉宽对对频谱展宽程度没有影响,但是较短脉冲产生的中红外超连续谱更为平坦。更多还原

【Abstract】 In this paper,microstructured chalcogenide fibers are used.By using the modified nonlinear Schrodinger equation (NLSE) and split-step Fourier algorithm,we analyze the effects of wavelength and seed pulse duration on mid-IR supercontinuum (SC) generation.The microstructured chalcogenide fibers used here are highly nonlinear and have two zero-wavelength wavelengths (ZDW).The longer one is mid-IR,which is helpful to mid-IR SC generation.There are marked differences when we change the frequency and duration of the seed pulse though stimulation.In the numerical stimulation,we seed pulses with different frequencies and duration,observing and comparing the results.We find that the width of mid-IR SC generating from pulses whose center wavelength near the ZDWs is more than that from pulse whose center wavelength distance from the ZDWs.Keep the peak power invariable,the width of the SC is steady.However,the shorter pulse can generate smoother mid-IR SC.更多还原