相位调制信号对窄线宽光纤放大器线宽特性和受激布里渊散射阈值的影响  

Effect of phase modulation on linewidth and stimulated Brillouin scattering threshold of narrow-linewidth fiber amplifiers

作　　者：刘雅坤 王小林[1,2] 粟荣涛 马鹏飞[1,2] 张汉伟 周朴[1,2] 司磊 

机构地区：[1]国防科学技术大学光电科学与工程学院,长沙410073 [2]大功率光纤激光湖南省协同创新中心,长沙410073

出　　处：《物理学报》2017年第23期143-153,共11页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:61505260);科技部重点研发计划(批准号:2016YFB0402200)资助的课题~~

摘　　要：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.Stimulated Brillouin scattering （SBS） currently limits the power scaling of narrow-linewidth amplifiers. To date, several techniques have been employed to suppress SBS. Within these SBS suppressing techniques, the phase modulation technique is a preferable approach to obtaining kilowatt-level narrow-linewidth laser sources. In this manuscript, we numerically investigate the influence of phase modulation signals on linewidth and SBS threshold, and discuss how to choose an appropriate modulation signal for suppressing SBS with less linewidth broadening. Three types of signals are studied, including sinusoidal signal, white noise signal （WNS）, and pseudo-random binary sequence signal （PRBS）. Signal parameters such as modulation frequency and modulation depth are also optimized. It is found that the linewidth increases linearly with the modulation frequency, and the linewidth is largest for WNS modulation for the same modulation frequency. Specially, the linewidth is approximate to the modulation frequency for PRBS modulation. In the case of sinusoidal modulation, the spectra exhibit a series of discrete sidebands at integer multiples of the modulation frequency while the spectral power density is almost continuous for WNS modulation. In the case of PRBS modulation, the spectra contain periodic features that are distributed as a function of modulation frequency and pattern length. The SBS threshold grows to a maximum at^100 MHz modulation frequency for the case of sinusoidal signal modulation, which can be further increased by increasing the modulation depth. The SBS threshold can be further increased by implementing the cascade sinusoidal signal modulation. When WNS modulation is employed, the SBS threshold increases almost linearly with the modulation frequency and has an S-shaped increase with the modulation depth. For the PRBS modulation, the pattern length has an optimal value for SBS suppressing：the SBS threshold increases almost linearly below a frequency, but keeps stable above that frequency. T

关 键 词：光纤放大器 受激布里渊散射 窄线宽 相位调制 

分 类 号：TN722[电子电信—电路与系统]