| 用焦散面半径方法计算双包层光纤的吸收效率 |
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| 引用本文： | 张辉,王子华.用焦散面半径方法计算双包层光纤的吸收效率[J].上海大学学报(自然科学版),2002,8(5):396-399. |
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| 作者姓名： | 张辉 王子华 |
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| 作者单位： | 上海大学,通信与信息工程学院,上海,200072 |
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| 基金项目： | 国家自然科学基金面上项目资助 (60 2 770 2 5 ) |
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| 摘 要： | 采用一种基于射线理论和模式理论相结合的方法 ,用模式理论计算焦散面半径 ,以此半径为判据用射线方法确定穿过纤芯的模式 ,即能被吸收的模式 .该模式的总数与总模数的比值即为泵浦吸收效率 .用此方法计算了两种圆形内包层截面的双包层光纤的纤芯对内包层中泵浦光的吸收效率与纤芯半径和偏芯距离的关系 .计算结果表明 :圆形内包层截面的双包层光纤激光器和放大器可以通过将纤芯偏离中心位置来提高吸收效率 .该结果与用 2维几何光学射线法的结果一致 .
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| 关 键 词： | 吸收效率 焦散面半径 双包层光纤 |
| 文章编号： | 1007-2861(2002)05-0396-04 |
| 修稿时间： | 2002年4月22日 |
Calculation of Absorption Efficiency for Double-Clad Optical Fiber by Using Radius of Caustic Surface |
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| ZHANG Hui,WANG Zi hua.Calculation of Absorption Efficiency for Double-Clad Optical Fiber by Using Radius of Caustic Surface[J].Journal of Shanghai University(Natural Science),2002,8(5):396-399. |
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| Authors: | ZHANG Hui WANG Zi hua |
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| Abstract: | Combining the mode analysis and ray optic theory, a new method to calculate absorption efficiency for double clad optical fibers is presented. The caustic surface is determined by using mode analysis. Taking the radius of caustic surface as a threshold, one can estimate whether or not an individual mode is absorbable. The ratio of the number of solvable modes to the total number of guided modes is then taken as absorption efficiency. Numerical examples are given, and compared with results of 2 D ray optics analysis. Dependence of absorption efficiency on core size and off set distance has also been investigated. |
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| Keywords: | absorption efficiency the radius of caustic surface double clad optical fiber |
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