高信噪比多波长2μm主动锁模光纤激光器  

High SNR multi-wavelength 2μm actively mode-locked fiber laser

作　　者：赵铭 王天枢[2] ZHAO Ming;WANG Tianshu(School of Information Science and Technology,Xiamen University Tan Kah Kee College,Zhangzhou 363105,China;National and Local Joint Engineering Research Center of Space Optoelectronics Technology,Changchun University of Science and Technology,Changchun 130022,China)

机构地区：[1]厦门大学嘉庚学院信息科学与技术学院,福建漳州363105 [2]长春理工大学空间光电技术国家地方联合工程研究中心,吉林长春130022

出　　处：《应用光学》2021年第1期194-199,共6页Journal of Applied Optics

基　　金：国家自然科学基金(61975021)。

摘　　要：介绍一种多波长掺铥主动锁模光纤激光器,增益介质为长2 m的掺铥光纤,主动锁模通过铌酸锂强度调制器实现。腔内加入基于双折射的光学滤波器,利用保偏光纤双折射滤波效应在滤除腔内多余超模噪声的同时,还可以实现多波长输出。基频下的锁模脉冲频谱信噪比可达68.48 dB,在稳定的锁模状态下波长信道数最大为5。此外,腔内偏振无关隔离器被替换为偏振相关隔离器后,将锁模脉冲加载数字信号同步调制,测得的眼图光信噪比提高了8.67 dB。测试结果表明,锁模脉冲的时间稳定性得到有效提升。A multi-wavelength thulium-doped actively mode-locked fiber laser was introduced,in which the gain medium was a 2 m thulium-doped fiber,and the active mode-locking could be realized by LiNbO3 intensity modulator.An optical filter based on birefringence was added into cavity,the birefringence filter effect of polarization maintaining fiber was used to filter out the superfluous supermode noise in cavity,and also the multi-wavelength output could be realized.The mode-locked pulse frequency spectrum signal-to-noise ratio could reach to 68.48 dB at fundamental frequency,and the maximum number of wavelength channels was 5 in a stable mode-locked state.Furthermore,the polarization independent isolator in cavity was replaced by polarization dependent isolator,and mode-locked pulse was modulated by digital signal.The optical signal-tonoise ratio of eye diagram can be increased by 8.67 dB,which indicates that time stability of mode-locked pulse can be improved effectively.

关 键 词：光纤激光器 主动锁模 多波长 高信噪比 

分 类 号：TN248[电子电信—物理电子学]