Novel Specialty Optical Fibers and Applications focuses on the latest developments in specialty fiber technology and its applications. The aim of this reprint is to provide an overview of specialty ...optical fibers in terms of their technological developments and applications. Contributions include:1. Specialty fibers composed of special materials for new functionalities and applications in new spectral windows.2. Hollow-core fiber-based applications.3. Functionalized fibers.4. Structurally engineered fibers.5. Specialty fibers for distributed fiber sensors.6. Specialty fibers for communications.
Orbital Angular Momentum in Fibers Wang, Jian; Zhang, Xi
Journal of lightwave technology,
04/2023, Letnik:
41, Številka:
7
Journal Article
Recenzirano
Orbital angular momentum (OAM) of light beams with helical phase front, as an alternative spatial dimension resource of photons, has attracted extensive attention over the past decades. Very ...recently, OAM in fibers has facilitated rapid development of various fiber-based applications, such as optical communications, optical manipulation, optical sensing, optical imaging, nonlinear optics, and quantum science. Comprehensive and in-depth understanding of OAM in fibers is of great interest to researchers in this area. Here, we give a tutorial overview of OAM in fibers. We first introduce the basic theories, including the eigenmode analysis method, mode coupling theory, and spin-orbit mapping of light in fibers. We then give a detailed classification of OAM fibers and discuss versatile spatial mode bases in fibers. After that, we review various OAM fiber designs, including conventional single-mode fibers, conventional multi-mode fibers, ring-core fibers, air-core fibers, photonic crystal fibers, negative-curvature hollow-core fibers, multi-core fibers, active fibers (e.g., erbium-doped fibers), etc. Besides, we describe the state-of-the-art commercial fiber manufacturing processes as well as testing and characterization methods for OAM fibers. We also review various active and passive OAM fiber devices. Moreover, we introduce several typical advanced applications based on OAM fibers, such as capacity scaling fiber-optic communications, remote vectorial Doppler velocimetry, super-resolution optical imaging, and high-dimensional quantum cryptography. Finally, we briefly discuss future challenges and prospects of OAM in fibers.
Different from traditional cavity-based fiber lasers, well-defined resonant cavities are replaced by random feedback mechanisms for lasing generation in random fiber lasers (RFLs). Ever since the ...first demonstration in 2007, RFLs with unique advantages, such as structural simplicity, high efficiency, good wavelength flexibility, and high stability have attracted plenty of attention. Due to their superior properties, RFLs have been widely used to improve system performances of optical fiber communication (OFC) and optical fiber sensing (OFS). In this article, we conducted an overview of the applications of RFLs in OFC and OFS. We initially describe the basic operation principles and the typical properties of the RFLs. Then, the scenarios of the RFLs in the OFC systems are discussed, including random fiber lasing amplification (RFLA) techniques for extending signal transmission distance in long-haul OFC and OFS systems, static and dynamic point sensing based on RFLs, and RFL-based novel light sources for OFC and OFS applications.
In order to overcome the capacity limitations of current lightwave systems based on the single-mode optical fiber, massively parallel transmission in the spatial domain space-division multiplexing ...(SDM) supported by extended parallelism in the frequency domain (ultrawideband (UWB) systems) must be used. This article reviews key aspects of parallel transmission systems as the only significant capacity scaling option going forward and discusses the various tradeoffs on an architectural level and a hardware integration level. In doing so, this article also serves as an introduction to the more detailed accounts of fiber-optic systems and their future scaling within this Special Issue of the Proceedings of the IEEE.
Natural composites exhibit exceptional mechanical performance that often arises from complex fiber arrangements within continuous matrices. Inspired by these natural systems, we developed a ...rotational 3D printing method that enables spatially controlled orientation of short fibers in polymer matrices solely by varying the nozzle rotation speed relative to the printing speed. Using this method, we fabricated carbon fiber–epoxy composites composed of volume elements (voxels) with programmably defined fiber arrangements, including adjacent regions with orthogonally and helically oriented fibers that lead to nonuniform strain and failure as well as those with purely helical fiber orientations akin to natural composites that exhibit enhanced damage tolerance. Our approach broadens the design, microstructural complexity, and performance space for fiber-reinforced composites through site-specific optimization of their fiber orientation, strain, failure, and damage tolerance.
Multicore fibers (MCFs) are expected as a good candidate for overcoming the capacity limit of a current optical communication system. This paper describes the recent progress on the MCFs for ...space-division multiplexing to be utilized in future large capacity long-distance transmission systems. Tradeoff issue between low crosstalk and high core density in MCFs is presented and prospect of large-space multiplicity of MCFs is discussed.
Mineral oxide fibers of various chemical compositions are reviewed: aluminosilicate, alumina, silica, biosoluble, fibers made from zirconium oxide, and others. Methods for manufacturing discrete and ...continuous fibers are given, such as spinning fibers from melts, sol-gel technology, spinning from solutions of metal salts, and others. The physicochemical characteristics of mineral fibers are described and their applications are indicated, such as thermal insulation up to 1150 or 1000°C and high temperature filtration for aluminosilicate and biosoluble fibers; thermal insulation up to 1600 or 2000°C, and reinforcement of composites used in the aerospace and defense industries for alumina fibers and fibers based on zirconium dioxide, and so on. Manufacturers of mineral oxide-containing fibers and products based on them in and outside of Russia are indicated.
Silica-based optical fibers with an ultra-high Yb concentration were systematically studied. Three the most commonly used in industry glass matrixes for active fiber core were investigated: ...aluminosilicate, phosphosilicate and aluminophosphosilicate. For all the glass hosts optical fibers doped with a record high concentration of Yb in a glass core were fabricated utilizing an all-gas-phase deposition based on MCVD technology. The factors limiting increase of Yb content in glasses and fibers were revealed. For the first time it was shown that highly Yb-doped fibers could nearly completely lose their active properties and the most probable reason for that is concentration quenching of luminescence.
Crescent-Shaped Anti-Resonant Hollow Core Fiber Wang, Yingying; Deng, Haoping; Hong, Yifeng ...
IEEE journal of selected topics in quantum electronics,
11/2024, Letnik:
30, Številka:
6: Advances and Applications of Hollow-Core Fibers
Journal Article
Recenzirano
Antiresonant hollow-core fibers (AR-HCFs) have emerged as a groundbreaking fiber technology. However, an inherent tradeoff exists between birefringence, loss, and bandwidth in AR-HCF. Here we propose ...a crescent-shaped core AR-HCF that achieves significant birefringence through asymmetric shaping, without compromising loss or bandwidth characteristics. Simulation results show, at birefringence of 10 −5 level, a confinement loss below 0.1 dB/km over 600 nm bandwidth can be achieved. Alternatively, at 10 −4 level birefringence, a confinement loss below 1 dB/km over 300 nm bandwidth is viable. The crescent-shaped AR-HCF intrinsically offers the coveted combination of ultralow loss, wide bandwidth, and high birefringence that has eluded previous approaches. It holds the promise of enabling polarization maintaining light transmission across long fiber length and wide bandwidths, paving the way for versatile applications in nonlinear optics, interferometric sensing, and coherent communications that hope to capitalize on the advantages offered by hollow core guidance.
Light Transmission Through a Hollow Core Fiber Bundle Sufian, Md Abu; Baleine, Erwan; Geldmeier, Jeffrey ...
IEEE journal of selected topics in quantum electronics,
2024-Nov.-Dec., Letnik:
30, Številka:
6: Advances and Applications of Hollow-Core Fibers
Journal Article
Recenzirano
Odprti dostop
This paper reports on the fabrication and performance of a fiber bundle with seven hollow cores arranged in a hexagonal pattern. The bundle shows individual core transmission with less than 0.07% ...core-to-core coupling over a length of 11 cm. Each core exhibits several transmission windows in the visible to near infrared region. These low attenuation regions with large higher order mode suppression are a result of anti-resonant guidance due to the negative curvature membranes encircling the cores. The central core exhibits the widest transmission window with a minimum loss of 4 dB/m between 1250 nm and 1450 nm. The lowest loss for the central core is estimated to be 2.5 dB/m at 600 nm. Such hollow core fiber bundles may be employed in applications including communication, imaging systems, high power laser delivery, or sensing.
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