光电反馈抑制掺铒光纤激光器的低频强度噪声  

Intensity noise of erbium doped fiber laser at low frequency suppression through optoelectronic feedback

作　　者：张飞[1] 朱军[1] 汪辉[1] 杨珂[1] 马良川[1] 俞本立[1] 

机构地区：[1]安徽大学光电信息获取与控制教育部重点实验室,安徽合肥230039

出　　处：《量子电子学报》2012年第3期311-315,共5页Chinese Journal of Quantum Electronics

基　　金：国家自然科学基金(60940022);教育部博士点基金(20093401110002);高校省级优秀青年人才基金(2011SQRL015)资助项目

摘　　要：通过光电反馈电路对掺铒光纤激光器的中低频噪声进行了抑制。根据速率方程理论,分析了影响掺铒光纤激光器强度噪声的因素,通过电路仿真分析优化反馈电路参数,重点讨论反馈信号的相位对噪声抑制的影响。实验表明:激光器的低频(小于20 kHz)强度噪声平均降低了10 dB,中频弛豫振荡峰处(30 kHz附近)抑制达35 dB,并且克服了光电反馈抑制强度噪声使弛豫振荡峰向高频移动,导致高频噪声增大的问题。优异的噪声特性使光纤激光器在光传感领域具有很高的实用价值。Abstract： The low and medium frequency intensity noise of the erbium doped fiber laser （EDFL） is suppressed by using optoelectronic feedback. The factors affecting the intensity noise of the EDFL axe analyzed by the rate equations. The importance of the phase of feedback signal in noise suppression are discussed by simulating and optimizing the feedback circuits. The experiment results show that the peak relaxation oscillation （about 30 kHz） is reduced to about 35 dB, at the low frequency band （below 20 kHz） falls to about 10 dB averagely and the relaxation oscillation peak moving to the higher frequency is suppressed. The excellent noise property indicates that the laser source has important applications in optical sensors.

关 键 词：激光技术 掺铒光纤激光器 强度噪声 光电反馈 

分 类 号：TN248[电子电信—物理电子学]