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Keywords = helical microstructure optical fiber

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12 pages, 5226 KB  
Communication
Refractive Index Sensing Using Helical Broken-Circular-Symmetry Core Microstructured Optical Fiber
by Mingjie Cui, Zhuo Wang and Changyuan Yu
Sensors 2022, 22(23), 9523; https://doi.org/10.3390/s22239523 - 6 Dec 2022
Cited by 1 | Viewed by 1935
Abstract
Helical twist provides an additional degree of freedom for controlling light in optical waveguides, expanding their applications in sensing. In this paper, we propose a helical broken-circular-symmetry core microstructured optical fiber for refractive index sensing. The proposed fiber consists of pure silica and [...] Read more.
Helical twist provides an additional degree of freedom for controlling light in optical waveguides, expanding their applications in sensing. In this paper, we propose a helical broken-circular-symmetry core microstructured optical fiber for refractive index sensing. The proposed fiber consists of pure silica and its noncircular helical core is formed by a broken air ring. By using finite element modeling combined with transformation optics, the modal characteristics of the fiber are investigated in detail. The results show that for the core located at the fiber center, the confinement loss of fundamental core modes increases with twist rate, whereas for a sufficiently large core offset the modes can be well confined owing to the twist-induced light guidance mechanism, showing decreases with rising twist rate in the loss spectra. Moreover, we have found that for large twist rates and core offsets, resonant peaks occur at different twist rates due to the couplings between the fundamental core modes and the highly leaky modes created by the helical structure. The refractive index sensing performance is also studied and the obtained results show that the proposed fiber has great potential in fiber sensing. Full article
(This article belongs to the Special Issue Novel Optical Fiber Sensors)
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9 pages, 4555 KB  
Communication
A Designed Twist Sensor Based on the SPR Effect in the Thin-Gold-Film-Coated Helical Microstructured Optical Fibers
by Mengwei Zhang, Lei Zhang, Qiang Chen, Ge Bai and Shuguang Li
Sensors 2022, 22(15), 5668; https://doi.org/10.3390/s22155668 - 28 Jul 2022
Cited by 14 | Viewed by 2381
Abstract
The traditional optical fiber-based twist sensing has the disadvantage of low sensitivity and difficulty of distinguishing the twist direction. Moreover, chiral isomerism may lead to sensing errors. In this paper, a six-hole helical microstructured optical fiber (HMSF) with a thin-gold-film-coat based on the [...] Read more.
The traditional optical fiber-based twist sensing has the disadvantage of low sensitivity and difficulty of distinguishing the twist direction. Moreover, chiral isomerism may lead to sensing errors. In this paper, a six-hole helical microstructured optical fiber (HMSF) with a thin-gold-film-coat based on the surface plasmon resonance (SPR) effect was designed. The twist sensing characteristics of this fiber were further analyzed. Numerical calculation and analysis show that the combination of helical effect and SPR effect can design an HMSF-based sensor that is very sensitive to distortion. In the torsion range of ±300°, the distortion sensitivity can reach 2470.7 pm/(rad/m), and the linear correlation coefficient is 0.99996. Based on the special sensing mechanism, it has a good linear coefficient over a large range. Additionally, the direction of the twist can be easily discerned. The HMSF in this work not only has high sensitivity, high linearity, high fault tolerance rate, and a wide range of measurement, but is also easy to manufacture. Therefore, it is promising in the field of twist sensing and has a good application prospect. Full article
(This article belongs to the Special Issue Enhanced Optical Fiber Based Surface Plasmon Resonance Sensors)
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25 pages, 6110 KB  
Review
Generation of Orbital Angular Momentum Modes Using Fiber Systems
by Hongwei Zhang, Baiwei Mao, Ya Han, Zhi Wang, Yang Yue and Yange Liu
Appl. Sci. 2019, 9(5), 1033; https://doi.org/10.3390/app9051033 - 12 Mar 2019
Cited by 49 | Viewed by 10175
Abstract
Orbital angular momentum (OAM) beams, characterized by the helical phase wavefront, have received significant interest in various areas of study. There are many methods to generate OAM beams, which can be roughly divided into two types: spatial methods and fiber methods. As a [...] Read more.
Orbital angular momentum (OAM) beams, characterized by the helical phase wavefront, have received significant interest in various areas of study. There are many methods to generate OAM beams, which can be roughly divided into two types: spatial methods and fiber methods. As a natural shaper of OAM beams, the fibers exhibit unique merits, namely, miniaturization and a low insertion loss. In this paper, we review the recent advances in fiber OAM mode generation systems, in both the interior and exterior of the beams. We introduce the basic concepts of fiber modes and the generation and detection theories of OAM modes. In addition, fiber systems based on different nuclear devices are introduced, including the long-period fiber grating, the mode-selective coupler, microstructural optical fiber, and the photonic lantern. Finally, the key challenges and prospects for fiber OAM mode systems are discussed. Full article
(This article belongs to the Special Issue Novel Insights into Orbital Angular Momentum Beams: From Fundamentals, Devices to Applications)
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