| 多模干涉器的精确计算及弱限制下的损耗分析 |
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| 引用本文： | 龚姣丽,李志扬.多模干涉器的精确计算及弱限制下的损耗分析[J].应用光学,2008,29(5):684-688. |
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| 作者姓名： | 龚姣丽 李志扬 |
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| 作者单位： | 1. 湖北工业大学,理学院,湖北,武汉,430068
2. 华中师范大学,物理科学与技术学院,湖北,武汉,430079 |
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| 基金项目： | 教育部科学技术研究项目 |
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| 摘 要： | 对多模干涉器的模场传播常数和光场分布进行了精确计算，并与解析近似计算结果进行了比较，发现在弱限制条件下出现输出光能量降低的真正原因：一方面是波导支持的导模数量较少，导致高频成分丢失，自映像质量下降，形成大的弥散斑，造成输出耦合损失；另一方面是由于高频辐射模直接辐射带走了一部分能量。该分析结果纠正了传统的模糊观念。
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| 关 键 词： | 多模干涉器 自映像原理 能量损耗 |
| 收稿时间： | 2008/3/3 |
Precise calculation for multimode interferometer and its energy loss analysis under weak constrain |
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| GONG Jiao-li,LI Zhi-yang.Precise calculation for multimode interferometer and its energy loss analysis under weak constrain[J].Journal of Applied Optics,2008,29(5):684-688. |
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| Authors: | GONG Jiao-li LI Zhi-yang |
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| Institution: | 1. School of Science, Hubei University of Technology, Wuhan 430068, China; 2. College of Physical Science and Technology, Central China Normal University, Wuhan 430079, China |
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| Abstract: | The propagation constant and the optical field distribution of the multimode interferometer were calculated precisely,and the results were compared with the results of the analytical approximate calculation. From the results,it is founded that there are two reasons for the decrease of output optical power under weak constrain. Firstly,the quantity of guided modes supported by the waveguide is small,which causes the poor self-imaging quality and great loss of the high-frequency components,forms the big dispersed spots,and results in the loss of the output coupling. Secondly,the partial energy is taken away by the direct radiation of the high-frequency radiating mode. |
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| Keywords: | multimode interferometer self-imaging principle energy loss |
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