Bragg gratings in multimode and few-mode optical fibers
Bragg gratings in multimode and few-mode optical fibers
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DOI：
10.1109/50.822797
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发表时间：
2000-02-01
影响因子：
4.7
通讯作者：
Gupta, S
中科院分区：
文献类型：
--
作者：
Mizunami, T;Djambova, TV;Gupta, S
对多模传输光纤中的布拉格光栅进行了实验和理论研究。在多模传输光纤中形成的布拉格光栅在反射或透射光谱中分别呈现出多个反射峰或多个透射谷。对于标准渐变折射率多模光纤，布拉格光栅的反射峰数量取决于传输模式的激发条件。在1.55μm左右，对于高度多模激发，布拉格光栅的反射峰数量为19个，对于低阶模式激发为3 - 4个。我们分析了传输模式的相位匹配条件，并确定一半的反射峰是对同一模式的反射，其余的是对相邻模式的反射。在色散位移光纤中，在三模传输下0.8μm左右的布拉格光栅在反射光谱中呈现出三个反射峰。每个反射峰的温度依赖性与单模光纤中常规布拉格光栅的相似。在渐变折射率多模光纤中的布拉格光栅上测量到的偏振依赖性可忽略不计。讨论了多模光纤（MMF）中布拉格光栅的一个优点及其应用。
Bragg gratings in optical fibers in multimode propagation are investigated experimentally and theoretically, Bragg gratings formed in optical fibers in multimode propagation show multiple reflection peaks or multiple transmission dips in the reflection or transmission spectra, respectively. For standard graded-index multimode fiber, the number of reflection peaks of a Bragg grating depends on excitation condition of propagating modes. The number of reflection peaks of a Bragg grating at around 1.55 mu m is 19 for highly multimode excitation and 3-4 for lower order mode excitation. We analyze the phase-matching conditions of the propagating modes and identify half of the reflection peaks as the reflection to the same mode and the rest as the reflection to the neighboring modes. In dispersion-shifted fiber, a Bragg grating at around 0.8 mu m in three-mode propagation shows three reflection peaks in the reflection spectrum, The temperature dependence of each reflection peak is similar to that of a conventional Bragg grating in single-mode fiber. Polarization dependence measured on a Bragg grating in multimode graded-index fiber is negligible. An advantage of Bragg gratings in multimode fiber (MMF) and the applications are discussed.