全正色散被动锁模光纤激光器中滤波器效应的研究  

Study of the Filter Effect in All-Normal-Dispersion Mode-Locked Fiber Lasers

作　　者：徐中巍[1] 张祖兴[1] 

机构地区：[1]江西师范大学物理与通信电子学院江西省光电子与通信重点实验室,江西南昌330022

出　　处：《激光与光电子学进展》2013年第2期167-172,共6页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(60807014;60967002);江西省教育厅科学基金(GJJ12170)资助课题

摘　　要：全正色散被动锁模光纤激光器以其能产生高能量、高线性啁啾耗散孤子脉冲而备受关注。全正色散耗散孤子产生的机理是激光腔内多种效应,包括增益、损耗、增益饱和、非线性和滤波等综合作用的结果。研究了全正色散耗散孤子光纤激光器中有无滤波器和滤波器带宽对激光输出性能的影响。通过数值模拟发现,加入带通滤波器后输出耗散孤子脉冲的时域脉宽较无滤波器时变窄,对应的光谱半峰全宽变宽,脉冲稳定锁模所需的时间减小。脉冲的峰值功率会随着滤波器带宽减小而增加,脉冲能量则在一定带宽变化范围内保持不变,但是过窄带宽的滤波器会带来额外的损耗,从而使得脉冲能量快速下降。这些结论为设计搭建高能超快全正色散耗散孤子光纤激光器提供理论参考。All-normal-dispersion mode-locked fiber lasers can generate high-energy and high-linear-chirp dissipative soliton pulses, so they have attracted much attention. The generation of dissipative solitons is attributed to an integrated result of all kinds of effects in the laser cavity, such as gain, loss, gain saturation, nonlinear effects and filtering. The effect of filter on the performance of output dissipative soliton pulses is detailedly investigated. Numerical simulation shows that dissipative solitons obtained in the fiber lasers with band-pass filter have narrower pulse duration and broader spectrum width than those from the lasers without a filter. Moreover, the establishing time of stable mode locking is shorter. The peak power of dissipative soliton pulses increases with the filter bandwidth decreasing, while the pulse energy almost keeps invariable within certain range of filter bandwidth. But in the limiting case of narrow filter bandwidth, the pulse energy decreases abruptly due to the large induced loss.

关 键 词：激光器 全正色散 被动锁模 耗散孤子 

分 类 号：TN253[电子电信—物理电子学]