红外与激光工程, 2018, 47 (8): 0803007, 网络出版: 2018-08-29  

基于45°倾斜光栅的重复频率可切换被动谐波锁模光纤激光器

Passively harmonic mode-locked fiber laser with switchable repetition rate based on a 45° tilted fiber grating
作者单位
1 上海大学 特种光纤与光接入网重点实验室 上海先进通信与数据科学研究院 上海大学特种光纤与先进通信国际合作联合实验室, 上海 200444
2 华中科技大学 光学与电子信息学院 下一代互联网接入系统国家工程实验室, 湖北 武汉 430074
摘要
基于非线性偏振旋转(NPR)技术, 搭建了一台重复频率可切换的被动谐波锁模掺铒光纤激光器。腔内45°倾斜光纤光栅(45° TFG)作为一种理想的光纤型起偏器, 与两侧偏振控制器(PC)一起实现非线性偏振旋转效应, 实现激光器的稳定锁模输出。在673 mW恒定泵浦功率下, 通过调节腔内的PC, 观测到了从基频到37阶谐波等多种锁模状态。该激光器可产生稳定的最高重复频率脉冲为783 MHz, 对应的谐波阶数是37阶, 且具有41 dB的边模抑制比(SSR)。高重复频率且稳定性好的脉冲可用于特定的应用中, 如现代光通信系统、光学传感等。
Abstract
A passively harmonic mode-locked erbium-doped fiber laser was built up based on nonlinear polarization rotation(NPR) technique with switchable repetition rates. A 45° tilted fiber grating(45°TFG) integrated in the cavity was considered as an ideal polarizer, which was combined with two polarization controllers to realize NPR mechanism. Under fixed pump power of 673 mW, a group of harmonic mode-locked pulses from 1st to 37th could be obtained only through adjusting the two polarization controllers carefully. The laser can produce stable pulses with the maximum repetition rate of 783 MHz which corresponds to 37th harmonic order, and the sidemode suppression ratio (SSR) of 37th harmonic mode is 41 dB. High repetition rate and stable pulses can be used in applications, such as modern optical communication system and optical sensors.

凌远达, 黄千千, 邹传杭, 闫志君, 牟成博. 基于45°倾斜光栅的重复频率可切换被动谐波锁模光纤激光器[J]. 红外与激光工程, 2018, 47(8): 0803007. Ling Yuanda, Huang Qianqian, Zhou Chuanhang, Yan Zhijun, Mou Chengbo. Passively harmonic mode-locked fiber laser with switchable repetition rate based on a 45° tilted fiber grating[J]. Infrared and Laser Engineering, 2018, 47(8): 0803007.

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