中文摘要：

在得到串联光纤Bragg光栅（FBG）光纤环形激光器双波长输出的基础上，通过提取单个波长并加入了反馈，实现了光纤环形激光器的波分复用（WDM）及有源传感。理论分析了双波长光纤激光器的工作原理及通道间的增益竞争机制，并推导得出了带有光反馈的输出信号。实验，结果显示，本文系统可用于实时测量多路振动靶的运动情况；通过研究不同条件下的系统输出，可以得出系统的输出信号与自混合干涉有着相同的灵敏度，可根据条纹的倾斜情况辨识待测物体的运动方向，同时可依据输出信号得到反馈靶面的运动情况。

英文摘要：

a dual-wavelength fiber ring laser with FBGs in series and its active sensing by extracting a single wavelength and adding feedback to the system are presented. The principle of the dual-wavelength fiber laser with gain competition among the applied channels and the output power with optical feedback are theoretically analyzed. We demonstrate this system for the measurement of the movement of vibrational targets and investigate the effect on output signals under different feedback conditions. The experimental results show that this system has the same sensitivity as the self-mixing interference,the dirocfion of the movement can be distinguished from the inclination of the fringes, and we can get information of the feedback targets from the output signals.