Effects of twisting and bending on LP21 mode propagation in optical fiber |
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Authors: | Yuan Yufeng Wu George Li Xian Fan Yuqiang Wu Xingkun |
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Institution: | Department of Optical Engineering, Zhejiang University, Hangzhou, 310027, China. yuanyf@zju.edu.cn |
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Abstract: | Twisting and bending characteristics of low-multimode LP21 mode propagation in optical fibers is presented for the first time. Theoretical fiber mode modeling, combining geometrical rotation with opto-elastic effects, demonstrates that the propagation of the LP21 mode is bending-effect-immune. Experimental testing verifies that the LP21 mode specklegram rotates 0.9112 of the fiber twist angle in a fused silica fiber, independent of any fiber bending. This characteristic allows for the LP21 mode to be highly applicable in fiber specklegram sensors. |
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