Special Issue "Hollow core optical fibers"

A special issue of Fibers (ISSN 2079-6439).

Deadline for manuscript submissions: 15 September 2018

Special Issue Editor

Guest Editor
Dr. Walter Belardi

Optoelectronics Research Centre, University of Southampton, Southampton SO17 1BJ, United Kingdom
Website | E-Mail
Interests: Hollow core optical fibers, Microstructured optical fibers, Antiresonant optical fibers, Nonlinear optical fibers, Birefringent optical fibers, Mid-Infrared optical fibers, Semiconductor optical fibers.

Special Issue Information

Dear Colleagues,

Hollow core optical fibers are a specific type of glass fiber that, unlike conventional optical fibers, allow the guidance of an optical wave in air. Their most promising advantages are, therefore, directly-linked to the absence of glass material in the fiber core, which, in principle, may be expected to imply, not only lower nonlinearity and dispersion, but also lower attenuation.

Even though the concept of hollow fibers has been known since the dawn of optical fiber technology, this field of research has really attracted the interest of the scientific community only with the advent of Photonic BandGap Fibers (PBGFs) in the late 1990s. The rapid development of PBGFs at the beginning of this century led to the demonstation of hollow optical fibers for high power and short optical beam delivery with unprecedent performances, but also led to a better understanding of its fundamental physical limitations in terms of optical attenuation.

In the last decade and, more in particular, in the last few years, this field of research has been gaining a great deal of attention. Investigations into novel optical designs, fabrication approaches, optical properties and use of hollow core optical fibers are generating an incredible number of advances in fields as broad as gas fiber lasers, optical fiber communication, optical fiber sensing, high power lasers, THz waveguides, mid-infrared and ultra-violet optical fibers, polymer optical fibers, and others.

This Special Issue of Fibers intends to cover recent advances in the general field of hollow core optical fibers and solicits contributions from researchers active in the optical design, fabrication, characterization, or the use of hollow core optical fiber technology.

Dr. Walter Belardi
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Fibers is an international peer-reviewed open access quarterly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 350 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Hollow core optical fibers
  • Optical fiber design and fabrication
  • Antiresonant optical fibers
  • Optical fiber properties
  • Microstructured optical fibers
  • Kagome Optical fibers
  • Photonic Bandgap Fibers
  • Optical fiber devices
  • THz waveguides
  • Gas lasers
  • Optical fiber sensing
  • Optical fiber communication
  • Optical fiber lasers
  • Mid-infrared optical fibers
  • Optical fiber applications

Published Papers (4 papers)

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Research

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Open AccessArticle Effect of Nested Elements on Avoided Crossing between the Higher-Order Core Modes and the Air-Capillary Modes in Hollow-Core Antiresonant Optical Fibers
Fibers 2018, 6(2), 42; https://doi.org/10.3390/fib6020042
Received: 14 May 2018 / Revised: 12 June 2018 / Accepted: 13 June 2018 / Published: 18 June 2018
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Abstract
Optimal suppression of higher-order modes (HOMs) in hollow-core antiresonant fibers comprising a single ring of thin-walled capillaries was previously studied, and can be achieved when the condition on the capillary-to-core diameter ratio is satisfied (d/D0.68).
[...] Read more.
Optimal suppression of higher-order modes (HOMs) in hollow-core antiresonant fibers comprising a single ring of thin-walled capillaries was previously studied, and can be achieved when the condition on the capillary-to-core diameter ratio is satisfied (d/D0.68). Here we report on the conditions for maximizing the leakage losses of HOMs in hollow-core nested antiresonant node-less fibers, while preserving low confinement loss for the fundamental mode. Using an analytical model based on coupled capillary waveguides, as well as full-vector finite element modeling, we show that optimal d/D value leading to high leakage losses of HOMs, is strongly correlated to the size of nested capillaries. We also show that extremely high value of degree of HOM suppression (∼1200) at the resonant coupling is almost unchanged on a wide range of nested capillary diameter dNested values. These results therefore suggest the possibility of designing antiresonant fibers with nested elements, which show optimal guiding performances in terms of the HOM loss compared to that of the fundamental mode, for clearly defined paired values of the ratios dNested/d and d/D. These can also tend towards a single-mode behavior only when the dimensionless parameter dNested/d is less than 0.30, with identical wall thicknesses for all of the capillaries. Full article
(This article belongs to the Special Issue Hollow core optical fibers)
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Open AccessArticle Fabrication of Shatter-Proof Metal Hollow-Core Optical Fibers for Endoscopic Mid-Infrared Laser Applications
Fibers 2018, 6(2), 24; https://doi.org/10.3390/fib6020024
Received: 27 March 2018 / Revised: 13 April 2018 / Accepted: 14 April 2018 / Published: 18 April 2018
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Abstract
A method for fabricating robust and thin hollow-core optical fibers that carry mid-infrared light is proposed for use in endoscopic laser applications. The fiber is made of stainless steel tubing, eliminating the risk of scattering small glass fragments inside the body if the
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A method for fabricating robust and thin hollow-core optical fibers that carry mid-infrared light is proposed for use in endoscopic laser applications. The fiber is made of stainless steel tubing, eliminating the risk of scattering small glass fragments inside the body if the fiber breaks. To reduce the inner surface roughness of the tubing, a polymer base layer is formed prior to depositing silver and optical-polymer layers that confine light inside the hollow core. The surface roughness is greatly decreased by re-coating thin polymer base layers. Because of this smooth base layer surface, a uniform optical-polymer film can be formed around the core. As a result, clear interference peaks are observed in both the visible and mid-infrared regions. Transmission losses were also low for the carbon dioxide laser used for medical treatments as well as the visible laser diode used for an aiming beam. Measurements of bending losses for these lasers demonstrate the feasibility of the designed fiber for endoscopic applications. Full article
(This article belongs to the Special Issue Hollow core optical fibers)
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Review

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Open AccessReview 3D Printed Hollow-Core Terahertz Fibers
Fibers 2018, 6(3), 43; https://doi.org/10.3390/fib6030043
Received: 22 May 2018 / Revised: 14 June 2018 / Accepted: 15 June 2018 / Published: 21 June 2018
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Abstract
This paper reviews the subject of 3D printed hollow-core fibers for the propagation of terahertz (THz) waves. Several hollow and microstructured core fibers have been proposed in the literature as candidates for low-loss terahertz guidance. In this review, we focus on 3D printed
[...] Read more.
This paper reviews the subject of 3D printed hollow-core fibers for the propagation of terahertz (THz) waves. Several hollow and microstructured core fibers have been proposed in the literature as candidates for low-loss terahertz guidance. In this review, we focus on 3D printed hollow-core fibers with designs that cannot be easily created by conventional fiber fabrication techniques. We first review the fibers according to their guiding mechanism: photonic bandgap, antiresonant effect, and Bragg effect. We then present the modeling, fabrication, and characterization of a 3D printed Bragg and two antiresonant fibers, highlighting the advantages of using 3D printers as a path to make the fabrication of complex 3D fiber structures fast and cost-effective. Full article
(This article belongs to the Special Issue Hollow core optical fibers)
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Open AccessReview Revolver Hollow Core Optical Fibers
Fibers 2018, 6(2), 39; https://doi.org/10.3390/fib6020039
Received: 15 May 2018 / Revised: 4 June 2018 / Accepted: 5 June 2018 / Published: 7 June 2018
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Abstract
Revolver optical fibers (RF) are special type of hollow-core optical fibers with negative curvature of the core-cladding boundary and with cladding that is formed by a one ring layer of capillaries. The physical mechanisms contributing to the waveguiding parameters of RFs are discussed.
[...] Read more.
Revolver optical fibers (RF) are special type of hollow-core optical fibers with negative curvature of the core-cladding boundary and with cladding that is formed by a one ring layer of capillaries. The physical mechanisms contributing to the waveguiding parameters of RFs are discussed. The optical properties and possible applications of RFs are reviewed. Special attention is paid to the mid-IR hydrogen Raman lasers that are based on RFs and generating in the wavelength region from 2.9 to 4.4 μm. Full article
(This article belongs to the Special Issue Hollow core optical fibers)
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