【作者】 付婧；

【导师】 刘迎；

【作者基本信息】 天津大学 ， 光学， 2007， 硕士

【摘要】 可调谐光纤激光器不仅是波分复用光纤通讯系统中的关键器件,还可以运用于相干光通信、光纤传感器和光谱分析等领域。声光可调谐掺铒光纤激光器利用集成光学声光可调谐滤波器(IAOTF)为调谐元件,具有调谐范围大,输出线宽窄,调谐速度快,调谐方便可靠并能直接与光纤匹配等优点。本课题是在声光可调谐滤波器尚未成熟的情况下,以光纤布拉格光栅作为滤波元件,进行的掺铒光纤激光器的研究。内容主要分三部分:1、介绍声光可调谐掺铒光纤激光器的基础理论和应用;2、根据光纤布拉格光栅的滤波特性,分析其在掺铒光纤激光器中分别作为饱和吸收体和滤波元件这两方面的应用;3、掺铒光纤激光器的实验研究,对基于光纤光栅滤波的线形腔和环形腔掺铒光纤激光器的实验结果进行对比和分析,由于两种连接的腔损耗不同,因此环形腔的阈值高于线形腔。但由于环形腔中泵浦光能充分得到吸收,转化效率高,因此输出激光功率值明显好于线形腔。得出在光纤长度一定时,腔结构的改变导致腔损耗及激光产生阈值的改变,进一步导致激射中心波长FWHM变化的结论。实验结果在理论上得到了验证。更多还原

【Abstract】 Tunable fiber laser is not only an important kind of device in wavelength-division-multiplexing fiber communication system, but also can be used in the fields of coherent communication, fiber sensor and spectrum analysis. Tunable erbium-doped fiber laser using an integrated optics acousto-optical tunable wavelength filter is studied, which has many advantages such as wide tunable range, narrow line width.The research is based on FBG as the filter by reason of acousto-optical tunable filter is during the experiment .The research is composed of three main parts: 1.Introduce the theory of acousto-optical tunable Erbium-doped fiber laser .2.Research on fiber bragg grating, what is analyzed is the application of FBG in Tunable Er3+-Doped Fiber Laser, which is based on the filter charactor. The application is about the saturated absorber part and the filter part.3.The experiment about the tunable Er3+-Doped Fiber Laser. Analyse the result of line-frame and circle-frame experiment. Because the losses are difference, the threshold of circle- frame is higher than line- frame. The light can be absorbed sufficiently, so the output of circle-frame is better than line-frame. The conclusion is that, when the length of fiber is fixed, different frames lead to different threshold, and the FWHM is different. The result of experiment is proved theoretically.更多还原