中文摘要：

通过直流磁控溅射镀膜，将磁致伸缩材料——铽镝铁被覆在一段去掉保护层的保偏光纤上，得到铽镝铁被覆保偏光纤结构的磁传感单元。采用保偏光纤及保偏光纤器件，建立马赫-曾德尔光纤干涉仪，将铽镝铁被覆保偏光纤结构的磁传感部分接在干涉仪的一臂中间，另一臂中接入保偏光纤绕制的压电陶瓷调制器进行光纤干涉系统的相位控制。该系统通过压电陶瓷调制器将相位控制在正交工作点上，解决了系统的相位衰落；全保偏光纤结构有效控制了系统偏振诱导的信号衰落，实现了系统对信号的稳定检测。实验得到了系统在不同大小直流偏置磁场作用下的磁场响应特性，结果表明，较大直流偏置磁场可使系统响应灵敏度提高约20倍，最小可测的交流磁场信号达到2．2×10^-8T。

英文摘要：

Optical fiber magnetic field sensor is obtained by coating the TbDyFe film around the naked polarization maintaining fiber by mean of DC magneton sputter technology. An all polarization maintaining fiber（PMF） M-Z interferometer has been manufaefured with PMF and PMF components, which has succeeded in controlling the phase and the polarization induced signal fading. Responses to magnetic field of the system have been measured with weak and strong DC bias magnetic field, proving that the strong DC bias magnetic field can raise the response of this system to the level of about twentyfold. The smallest AC magnetic field signal of 2.2 × 10^-8 T can be obtained in this system.