An asymmetric STNS-MZI structure and its applications in temperature and Cd2+ monitoring

IF 2.6 3区计算机科学 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

Optical Fiber Technology Pub Date : 2024-09-29 DOI:10.1016/j.yofte.2024.103987

Huiyu Li , Qiqi Tu , Zhang Zhang , Jin Tao , Changyuan Yu , Xuguang Huang , Wei Xu

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引用次数: 0

Abstract

In this paper, an asymmetric fiber Mach-Zehnder interferometer (MZI) is presented and investigated. The proposed asymmetric MZI structure is mainly constructed with thin core fiber (TCF) and no core fiber (NCF), sandwiched between single mode fibers (SMFs). Note that the TCF is spliced with a slight offset such that higher order cladding modes could be effectively exited. The SMF-TCF-NCF-SMF (STNS) structure is adjusted by a finite-difference beam propagation method simulation to achieve an optimal interference spectrum. Temperature monitoring performance is addressed and the calculated sensing resolution is about 0.28 ℃ with high precision of ± 0.3 °C. Moreover, as for the Cd²⁺ monitoring application, the TCF is further etched and then coated with 1-allyl-2-thiourea (ATU) forming cross-linked “-S-Cd-S-” structure. The results show that the resolution of Cd²⁺ could reach 2.37 × 10⁻¹¹mol /L, which shows a four order of magnitude improvement compared with our previous work. Therefore, the proposed asymmetric STNS-MZI interference structure has great potential in future applications.

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不对称 STNS-MZI 结构及其在温度和 Cd2+ 监测中的应用

本文介绍并研究了一种非对称光纤马赫-泽恩德干涉仪（MZI）。所提出的非对称 MZI 结构主要由夹在单模光纤（SMF）之间的薄芯光纤（TCF）和无芯光纤（NCF）构成。需要注意的是，TCF 在拼接时略有偏移，这样可以有效地输出高阶包层模式。SMF-TCF-NCF-SMF (STNS) 结构通过有限差分光束传播方法模拟进行调整，以获得最佳干涉频谱。温度监测性能得到了解决，计算得出的传感分辨率约为 0.28 ℃，精度高达 ± 0.3 ℃。此外，在 Cd2+ 监测应用中，TCF 被进一步蚀刻，然后镀上 1- 烯丙基-2-硫脲（ATU），形成交联的"-S-Cd-S-"结构。结果表明，Cd2+ 的分辨率可达 2.37 × 10-11mol /L，与我们之前的工作相比提高了四个数量级。因此，所提出的非对称 STNS-MZI 干涉结构在未来的应用中大有可为。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Optical Fiber Technology 工程技术-电信学

CiteScore

4.80

自引率

11.10%

发文量

327

审稿时长

63 days

期刊介绍： Innovations in optical fiber technology are revolutionizing world communications. Newly developed fiber amplifiers allow for direct transmission of high-speed signals over transcontinental distances without the need for electronic regeneration. Optical fibers find new applications in data processing. The impact of fiber materials, devices, and systems on communications in the coming decades will create an abundance of primary literature and the need for up-to-date reviews. Optical Fiber Technology: Materials, Devices, and Systems is a new cutting-edge journal designed to fill a need in this rapidly evolving field for speedy publication of regular length papers. Both theoretical and experimental papers on fiber materials, devices, and system performance evaluation and measurements are eligible, with emphasis on practical applications.