An all-fiber passively picosecond mode locked Erbium doped laser using a 45° tilted fiber grating (45° TFG) and a fiber Bragg grating (FBG) is reported in this work. Due to the strong polarization dependent loss (PDL) of 45° TFG and narrow 3-dB bandwidth of FBG, the Erbium doped fiber laser (EDFL) can generate picosecond mode locked pulse based on the nonlinear polarization rotation (NPR) effect. The laser features a repetition rate of 9.67 MHz, a pulse duration of 33 ps, a signal-to-noise ratio (SNR) of 70 dB, an average output power of 1.2 mW, and a single pulse energy of 124 pJ under the pump power of 102 mW. Besides, the central wavelength of the laser can be continuously adjusted from 1550.65 nm to 1551.44 nm. The technique of using a 45° TFG to generate picosecond pulses can be readily extended to other wavelength such as mid-infrared (mid-IR) where fiber polarizing components are either expensive or not available. To the best of our knowledge, the spectral width is the narrowest among all-fiber passively mode locked Erbium-doped laser based on NPR

中文翻译：

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使用45°倾斜光纤光栅装置的窄带宽无源锁模皮秒掺b光纤激光器

在这项工作中报道了使用45°倾斜光纤光栅（45°TFG）和布拉格光纤光栅（FBG）的全光纤被动皮秒模式锁定掺Er激光器。由于45°TFG的强偏振相关损耗（PDL）和FBG的窄3dB带宽，掺do光纤激光器（EDFL）可以基于非线性偏振旋转（NPR）效应生成皮秒锁模脉冲。该激光器的重复频率为9.67 MHz，脉冲持续时间为33 ps，信噪比（SNR）为70 dB，泵浦下的平均输出功率为1.2 mW，单脉冲能量为124 pJ功率为102毫瓦。另外，激光器的中心波长可以连续地从1550.65nm调整到1551.44nm。使用45°TFG生成皮秒脉冲的技术可以很容易地扩展到其他波长，例如中红外（mid-IR），其中光纤偏振组件价格昂贵或无法获得。据我们所知，在基于NPR的全光纤被动锁模掺mode激光器中，光谱宽度是最窄的