全光纤超短脉冲掺铒光纤自相似放大系统研究

Research on the Self Similarity Amplification System of All Fiber Structure Ultra Short Pulse Erbium-Doped Fiber

摘要: 本文研究了1.5 μm波段基于全光纤结构的超短脉冲掺铒光纤自相似放大器。采用正常色散的掺铒增益光纤分析脉冲在放大过程中的自相似演化过程。实验将种子源输出的重复频率为44 MHz，脉冲宽度为797 fs的信号光经预放大级，用高增益正色散掺铒光纤将种子源输出的孤子脉冲整形成抛物线型脉冲，整形后的信号光通过主放大级使用双向泵浦方式将0.43 mW的种子光输出功率放大到60.14 mW，实现主放大级功率放大且光谱宽度为61.69 nm，脉冲宽度1.82 ps。最后经2.3 m长的普通单模光纤(SMF)进行压缩。最终实现了平均输出功率60.14 mW，脉冲宽度83 fs，峰值功率16.85 kW的高功率自相似超短脉冲输出。

Abstract: This article studied 1.5 μm band ultra short pulse erbium-doped fiber self similarity amplifier based on all fiber structure, and analyzed the self similarity evolution process of pulses during amplification using erbium-doped gain fibers with normal dispersion. In the experiment, the signal light output by the seed source with a repetition frequency of 44 MHz and a pulse width of 797 fs was subjected to a pre amplification stage. The soliton pulse output by the seed source was formed into a parabolic pulse using a high gain positive dispersion erbium-doped fiber. The shaped signal light was amplified from 0.43 mW to 60.14 mW using a bidirectional pump method in the main amplification stage, achieving power amplification in the main amplification stage with a spectral width of 61.69 nm and a pulse width of 1.82 ps. Finally, it was compressed using a 2.3-meter-long ordinary single-mode fiber (SMF). Ultimately, a high-power self similar ultra short pulse output was achieved with an average output power of 60.14 mW, a pulse width of 83 fs, and a peak power of 16.85 kW.