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首页> 外文期刊>Optical fiber technology >Investigation on the impact of irregular fringe patterns of a single-fiber Mach-Zehnder interferometer on its sensing capabilities
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Investigation on the impact of irregular fringe patterns of a single-fiber Mach-Zehnder interferometer on its sensing capabilities

机译：研究单纤维马赫曾德尔干涉仪的不规则条纹图案对其感测能力的影响

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摘要

A novel single-mode single-fiber (SMSF) MZI formed by cascading of two non-adiabatic fiber tapers, with stable and repeatable spectrum, has been found to be useful in sensing applications in recent times. A multimode interference based novel simulation approach is proposed to predict the sensing characteristics of SMSF-MZI and is validated with experimental observation. The proposed method includes solving of simultaneous non-homogenous equations for determining the amplitudes of the interfering modes excited in the tapered section of the interferometer. The simulated fringe pattern and the experimental spectral response converge to some important comprehension reported for the first time. A linear shift in output spectral response, of SMSF-MZI, due to change in optical path length induced by temperature/strain etc., is likely to be characterized by three modes interference occurring in the interference region of the interferometer. Whereas if the spectral shift starts saturating at moderately higher temperature/strain, then the formation of interference fringes are possibly governed by two modes interference. Further, it was also explained that a SMSF-MZI with variable fringe widths in its spectral pattern exhibits higher sensitivity than that of the SMSF-MZI having wavelength spectrum with uniform free spectral range. These findings are useful in selecting and predicting the sensitivity of a given SMSF-MZI, based on its spectrum, for sensing applications.
机译：由两个非绝热纤维锥级联而成的新颖单模单纤维（SMSF）MZI，具有稳定和可重复的光谱，已被发现在近代传感应用中很有用。提出了一种基于多模干扰的新型仿真方法来预测SMSF-MZI的传感特性，并通过实验观察进行了验证。所提出的方法包括求解联立的非齐次方程，以确定在干涉仪的锥形部分中激发的干涉模的振幅。模拟的条纹图案和实验光谱响应收敛到首次报告的一些重要理解。由于温度/应变等引起的光程长度变化，SMSF-MZI的输出光谱响应线性变化很可能以干涉仪的干涉区域中发生的三种模式干涉为特征。而如果频谱偏移在较高的温度/应变下开始饱和，则干涉条纹的形成可能受两种模式的干涉支配。此外，还解释了其光谱图案中具有可变条纹宽度的SMSF-MZI比具有具有均匀自由光谱范围的波长光谱的SMSF-MZI具有更高的灵敏度。这些发现可用于根据其频谱为传感应用选择和预测给定SMSF-MZI的灵敏度。

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