Abstract
高功率窄线宽光纤放大器的输出功率主要受限于受激布里渊散射（SBS）效应，通过相位调制进行线宽展宽可以有效抑制SBS效应.基于窄线宽光纤放大器中的SBS动力学模型，研究了正弦信号、白噪声信号和伪随机编码信号（PRBS）对窄线宽光纤放大器光谱特性与SBS阈值的影响.研究发现，采用不同信号进行相位调制时，调制频率和调制深度等参数对调制后激光光谱的谱线间隔、谱线数目与光谱平整度的影响存在较大差异，进而影响放大器的线宽特性和SBS阈值.通过对比分析，给出了调制信号的类型选择和参数优化原则，能够为窄线宽光纤放大器的相位调制系统设计提供参考.
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