单频光纤激光器是光纤通信中最具前途的一种光源, 在光纤传感、激光雷达和激光测距等方面具有重要的应用, 而相位噪声是衡量其性能的关键指标之一。采用示波器和动态信号分析仪方法对单频光纤激光器的相位噪声进行测量。利用功率谱、积分谱对不同泵浦源功率、种子源功率和波长的光纤激光器的相位噪声进行定性分析, 结果表明: 泵浦功率越大, 低频相位噪声所占比重越大; 而对于不同种子源功率, 相位噪声在测试频段的比例基本处于同一水平; 对于测试的不同种子的波长, 相位噪声高频段所占比例不同, 其中种子波长为1 560.48 nm比例最大。

Single frequency fiber laser is the most promising optical source in fibre optic communication, which plays an important role in fibre optic sensor, laser radar and laser range finde. Generally, the performance of the single frequency fiber laser was evaluated by the phase noise. The oscilloscope and dynamic signal analyzer method were adopted to design phase noise of single frequency fiber laser. Using power spectrum and the integral sources of different pump power, seed source power and wavelength of the fiber laser phase noise were analyzed qualitatively, the results show that, the greater pump power can get the low frequency phase noise. For the different seed source powers, phase noise is in the proportion of basic test frequency at the same level. For testing seeds of different wavelengths which is different proportions of high frequency phase noise, the biggest percentage of seed wavelength is 1 560.48 nm.