少模光纤长周期光栅——从模式转换到高灵敏度光纤传感

doi:10.3969/j.issn.0255-8297.2020.02.007

Abstract

Abstract: Few-mode fber (FMF) long-period grating (LPG) with advantages of good wavelength selectivity, low insertion loss, flexible structure, high integration and compatibility with optical fber systems,is an effective means to realize mode conversion and vortex mode regulation in the FMF, which have great potential for applications in the optical fber communications and fber-optic sensing. This paper presents the research progress of FMF-LPG in mode conversion and optical fber sensing. Firstly, the mode coupling principle and fabrication methods of FMF-LPG are introduced. Then, the mode converters based on FMF-LPG including standard LPG and helical LPG are investigated. Finally, the working principle and implementation method of fber-optic sensors based on FMF-LPG are demonstrated.

Key words: few-mode fber, long-period grating, mode converter, fber-optic sensing

CLC Number:

P751.1

ZHAO Yunhe, LIU Yunqi. Few-Mode Fiber Long-Period Gratings—From Mode Conversion to High Sensitivity Fiber-Optic Sensing[J]. Journal of Applied Sciences, 2020, 38(2): 310-338.

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Few-Mode Fiber Long-Period Gratings—From Mode Conversion to High Sensitivity Fiber-Optic Sensing

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