| 声光光纤模式耦合的分析 |
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| 引用本文： | 肖彦萍,吴亚明,薛时光.声光光纤模式耦合的分析[J].上海大学学报(自然科学版),2001,7(6):481-486. |
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| 作者姓名： | 肖彦萍 吴亚明 薛时光 |
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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(69777014)资助项目;上海科委启明星(98QD14020)资助项目 |
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| 摘 要： | 光纤声光器件是基于光纤中的超声光栅引起的两个光波同向模式间的耦合，此文比较了声切变波和疏密波激发的光纤超声光栅对双模光纤中对称模LP01,非对称模LP11间模式耦合的影响，得到一个重要结论：除了光纤超声光栅的周期必须满足这两个耦合模式间的相位匹配条件小，该光纤超声光栅还必须要破坏这两个模式间径向电场的正交性，这一结论为光纤声光器件控制光纤超声光栅产生有效的模式耦合提供了理论依据。
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| 关 键 词： | 模式耦合 光纤声光器件 光纤超声光栅 相位匹配 波分复用光纤通信网 切变声波 声疏密波 |
| 文章编号： | 1007-2861(2001)06-0481-06 |
| 修稿时间： | 2000年11月5日 |
Analysis of Acousto-Optic Fiber Mode Coupling |
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| XIAO Yan ping,WU Ya ming,XUE Shi guang.Analysis of Acousto-Optic Fiber Mode Coupling[J].Journal of Shanghai University(Natural Science),2001,7(6):481-486. |
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| Authors: | XIAO Yan ping WU Ya ming XUE Shi guang |
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| Abstract: | Fiber acousto optic devices are based on coupling between two copropagating modes caused by ultrasonic grating in the fiber. The different fiber ultrasonic gratings made of acoustic transverse and longitudinal wave result in the different mode coupling between LP 01 and LP 11 modes with different properties. This leads to an important result, that is, in order to make the two modes couple effectively, the fiber ultrasonic grating must disturb the orthogonality between the two modes in addition to the phase match condition. According to the result, the fiber ultrasonic grating caused by ultrasonic wave in the fiber can be selected to achieve effective coupling of the two fiber optic modes. |
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| Keywords: | mode coupling fiber acouso optic device fiber ultrasonic grating |
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