【作者】 金晨； 杨四刚； 王小建； 陈宏伟； 陈明华； 谢世钟；

【Author】 JIN Chen;YANG Sigang;WANG Xiaojian;CHEN Hongwei;Chen Minghua;XIE Shizhong;Tsinghua National Laboratory for Information Science and Technology (TNList), Department of Electronic Engineering, Tsinghua University;

【机构】 清华大学电子工程系信息科学与技术国家实验室；

【摘要】 在一个被动锁模掺铒光纤激光器中实现了1550 nm波段超窄线宽、无啁啾的纳秒级光脉冲产生。自制的光纤布拉格光栅在腔内实现了主动滤波以获得极窄的谱宽,通过添加色散补偿光纤进行腔内色散管理,以及通过添加非零色散位移光纤优化腔长,获得了稳定的锁模脉冲,经测量其脉冲脉宽为2 ns,线宽为192 MHz,接近傅里叶变化极限。脉冲重复率为982 kHz,计算可知锁模脉冲中的振荡单纵模数约为192。研究了该类锁模脉冲随腔长和色散改变的稳定性变化和参数变化。实现的纳秒级脉冲有着良好的稳定性,将可以用于MOPA系统获得高峰值功率。更多还原

【Abstract】 A stable nanosecond pulse generation with ultra-narrow bandwidth is established from a passively mode-locked erbium-doped fiber laser. The generated pulse is nearly chirp-free. A well-designed homemade fiber Bragg grating(FBG) is applied to filter the spectrum to realize long pulse duration and ultra-narrow spectrum. DCF is added in the ring-cavity to manage the intra-cavity dispersion and True Wave fiber is added to optimize the cavity length. The measured pulse width is 2 ns and the spectral width is only 192 MHz. that is close to the Fourier transform-limit. The pulse repetition rate is 982 kHz which reveals there’re only 195 oscillating longitudinal modes. The stability and the parameters is investigated when the intra-cavity dispersion and the cavity length changed. The proposed pulse is so stable to be applied to the MOPA system.更多还原