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选用普通商用带尾纤的分布反馈式(DFB)半导体激光器作从激光器,测试了DFB半导体激光注入锁定的基本特性,如不同注入光功率下的锁定带宽、模式频谱、相位噪声及输出光功率,证明了相干光注入锁定具有极大改善从激光器频谱纯度同时不影响其输出光功率的特性;锁定后的从激光器可看作一个窄带、可调谐的光滤波器,并能提供一定的功率增益,滤波器的中心波长和带宽完全由注入光信号决定。将DFB半导体激光注入锁定技术应用于基于微波电光移频的布里渊光纤传感,实现了具有布里渊频移的单频信号提取放大,解决了直流工作点漂移带来的光强波动问题。
The DFB semiconductor laser with common commercial pigtail feedback (DFB) laser diode is used to test the basic characteristics of DFB semiconductor laser injection locking, such as the locking bandwidth, mode spectrum, phase noise and output optical power under different injected optical power, It is proved that coherent light injection locking can greatly improve the spectral purity of the laser without affecting its output optical power. The locked slave laser can be regarded as a narrow band tunable optical filter and can provide certain power gain, The center wavelength and bandwidth of the filter are completely determined by the injected optical signal. The DFB semiconductor laser injection locking technique is applied to the Brillouin optical fiber sensing based on the microwave electro-optical frequency shift to realize the single-frequency signal extraction and amplification with Brillouin frequency shift to solve the problem of light intensity fluctuation caused by the DC working point drift .