| 摘要: |
| 为了提高无芯光纤在折射率方面的灵敏度,并针对无芯光纤的结构参数优化尚不够深入的问题,提出了一种无芯光纤结构参数的优化方法,研究了单模-无芯-单模（SNCS）的“三明治”光纤在折射率（RI）传感中的灵敏度等性能指标. 基于Rsoft光学仿真软件,利用光束传播法对SNCS光纤进行仿真研究,模拟了光场分布和输出透射谱特性. 为了提高传感灵敏度,在保证透射谱不重叠的条件下,通过计算自成像周期和波长偏移量等指标,系统地优化了长度和直径等无芯光纤的结构参数. 仿真结果表明,当无芯光纤长度为6.55 mm且直径为20 μm时,RI在1.380~1.390内,SNCS光纤的灵敏度可达到2 200.92 nm/RIU,也验证了所提出的无芯光纤结构参数优化方法的有效性,为基于无芯光纤用于高灵敏RI传感的“三明治”光纤的结构设计与应用提供了理论支撑. |
| 关键词: 折射率（RI）传感 无芯光纤 “三明治”光纤 参数优化 |
| DOI：10.3969/J.ISSN.1000-5137.2024.03.002 |
| 分类号:TN253 |
| 基金项目:上海交通大学区域光纤同行网与新型光通信系统国家重点实验室开放课题（2022GZKF009）；上海师范大学校一般科研项目（KF2021104） |
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| Parameter optimization of the "sandwich" fiber based on no-core fiber in refractive index sensing applications |
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WANG Xiong, WU Xiangnong
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College of Information, Mechanical and Electrical Engineering, Shanghai Normal University, Shanghai 201418, China
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| Abstract: |
| In order to improve the sensitivity of no-core fiber in refractive index and to address the problem that the optimization of structural parameters of no-core fibers was not sufficient, the optimization method for the structure parameters of no-core fiber was proposed, and the performance of the sensitivity of single mode-no-core-single mode （SNCS） fibers in refractive index（RI） sensing was investigated in this paper. The fibers were simulated using Rsoft optical simulation software through the beam propagation method, by which the optical field distribution and output transmission spectra were simulated. To enhance sensing sensitivity, the geometrical parameters of no-core fiber, including length and diameter, were systematically optimized by calculating the self-imaging period and wavelength shift under the condition that the transmission spectra did not overlap. It was demonstrated that SNCS fiber could reach a sensitivity of 2 200.92 nm/RIU in the refractive index range of 1.380-1.390 with the length of the no-core fiber 6.55 mm and the diameter 20 μm. It also verified the effectiveness of the proposed parameter optimization method for the no-core fiber structure. Through structural optimization, theoretical support was provided for designing structure and application of sandwich fiber based on no-core fiber in highly sensitive refractive index sensing. |
| Key words: refractive index （RI） sensing nocore fiber “sandwich” fiber parameter optimization |
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