强泵浦条件下光纤放大器相位噪声的测量
Measurement of phase noise in strong pumped fiber amplifier
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摘要: 利用多抖动法对强泵浦条件下光纤放大器引入的相位噪声进行了测量。利用功率谱、积分谱对具体泵浦条件下的相位噪声特性进行定性分析，结果表明，泵浦功率越大，高频成分占的比例越大。利用结构函数定量分析相位噪声的变化特性，得出相位噪声控制系统的带宽需求指标。实验测得在71，181和230 W泵浦条件下，所需相位控制系统带宽最小值分别为830 Hz，3.1 kHz和10 kHz。Abstract: The phase noise in a strong pumped fiber amplifier is measured using multi-dithering method. Its fluctuation property is qualitatively characterized by the power spectral density and integral spectral density, and it is concluded that the ratio of high frequency phase noise increases with the increase of pump power. The bandwidth requirement of the active phase control system is quantificationally estimated through evaluating the structure function of the measured phase noise. The experimental measurement and analysis show that the minimum bandwidths of the system are 830 Hz, 3.1 kHz and 10 kHz under the pump powers of 71 W, 181 W, and 230 W, respectively.
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Key words:
- fiber amplifier /
- coherent beam combining /
- phase noise /
- multi-dithering technique /
- structure function
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