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探测系统的侧向偏移和角向倾斜对光束轨道角动量谱测量的影响研究
发表时间：2008-04-15 浏览量：2154 下载量：945
| 全部作者： | 刘义东，高春清，齐晓庆 |
| 作者单位： | 北京理工大学信息科学技术学院 |
| 摘 要： | 在利用光束轨道角动量进行自由空间光通信的时候，轨道角动量谱受探测系统相对于入射光束的侧向偏移和角向倾斜的影响比较严重，进而引起轨道角动量态误判和误码的增加。为了解决这个问题，需要分析探测系统的侧向偏移和角向倾斜对轨道角动量谱测量的影响。本文采用量子算符方法来分析自由空间光通信中系统非对准对光束轨道角动量谱的影响机理，并通过数值计算对这种影响机理给予直观地展示。这种方法具有明确的物理意义和简洁的数学表示。研究结果表明，探测系统的侧向偏移和角向倾斜对轨道角动量谱都有相似的影响，其特征服从第一类贝塞尔函数。该研究对修正利用光束轨道角动量进行自由空间通信系统的校准有重要意义。 |
| 关 键 词： | 物理电子学；轨道角动量；轨道角动量谱；自由空间光通信 |
| Title： | Influence on the orbital angular momentum spectrum caused by the misalignment of detection system |
| Author： | LIU Yidong, GAO Chunqing, QI Xiaoqing |
| Organization： | School of Information Science and Technology, Beijing Institute of Technology |
| Abstract： | When the orbital angular momentum of light beam is used in the free space optical communication, the misalignments of the detection system, i.e. lateral shift and angular tilt, will diffuse the orbital angular momentum spectrum and therefore cause the wrong orbital angular momentum states and error emergence. To deal with this problem, the affections on the orbital angular momentum spectrum of the misalignments should be clarified. In this work, a quantum operator method is used to analyse the influence on the orbital angular momentum spectrum caused by the misalignments of the detection system in free space optical communication, and the calculation is also given to directly show the mechanism of the affections. This work also gives clear physical meaning and simple mathematical expression of these two kinds of affections and the results show similar influence caused by the two kinds of misalignment which obey the rule denoted by the first kind Bessel function. The work is important in the correction of the orbital angular momentum spectrum in free space optical communication by using the orbital angular momentum. |
| Key words： | physical electronics; orbital angular momentum; orbital angular momentum spectrum; free space optical communication |
| 发表期数： | 2008年8月第7期 |
| 引用格式： | 刘义东，高春清，齐晓庆. 探测系统的侧向偏移和角向倾斜对光束轨道角动量谱测量的影响研究[J]. 中国科技论文在线精品论文，2008，1（7）：810-815. |
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