分布反馈光纤激光器弯曲特性的实验研究

为了研究分布反馈光纤激光器的弯曲特性,对光纤激光器输出波长和弯曲半径的关系进行了理论分析和实验研究.理论分析表明,光纤激光器输出波长变化量与弯曲半径平方的倒数为线性相关,并且随着弯曲半径的增大布拉格波长向短波长方向移动|实验中通过对3支不同波长的光纤激光器在弯曲半径分别为10 mm、20 mm、90 mm时输出波长的测量,验证了理论分析的正确性.实验中采用参考光纤激光器法排除环境干扰,对光纤激光器的激射功率进行了耐弯曲测试,并验证了光纤激光器斜率效率优越的抗弯曲特性.结果表明,在测试的32天内,待测光纤激光器激射功率变化量均小于2 dB,为分布反馈光纤激光器做为弯曲类传感应用的研究提供了重要的参考依据.

Experimental Investigation of Bending Characteristics of Distributed Feed Back Fiber Lasers

The bending characteristics of distributed feed back fiber lasers were investigated.Firstly,a theoretical model of fiber lasers output wavelength and bending radius was presented.It shows a linear correlation between the output wavelength variation of fiber lasers and the inverse square of the bending radius,and as the bending radius increases,the Bragg wavelength experiences a blue shift.In corresponding experiments,3 fiber lasers were used to test output wavelength with bending radii between 10 mm and 90 mm|these experiments demonstrate the accuracy of the theoretical analysis.Secondly,fiber lasers output power and bending radius were studied.One fiber laser was used as reference to eliminate environmental interference.The experiment shows fluctuation ranges of fiber lasers output power are less than 2 dB during the experimental time in 32 days.Finally,the slope efficiency is investigated,showing excellent bending insensitivity.The results provide an important reference for DFB fiber lasers in applications of bending sensing.