scholarly journals Control of the mode composition of optical radiation in a microstructured fiber

2021 ◽  
Vol 2086 (1) ◽  
pp. 012158
Author(s):  
G A Pchelkin ◽  
V B Fadeenko ◽  
V V Davydov ◽  
V Yu Rud
Keyword(s):  
Optical Fibers ◽  
Optical Radiation ◽  
Optical Vortex ◽  
Fiber Structure ◽  
Microstructured Fiber ◽  
Microstructured Fibers ◽  
Mode Composition ◽  
Technological Cycle

Abstract The construction structure of microstructured fibers is considered. A research scheme of the mode composition and defects control in optical fibers is developed. A microstructured fiber for studying optical vortex fields has been developed and manufactured. The results of studies of the same fiber structure and the distribution of optical radiation depending on the parameters of the technological cycle of its production are presented.

Interfacial Energy and Materials Selection Criteria in Composite Microstructured Optical Fiber Fabrication

2003 ◽  
Vol 797 ◽  
Author(s):  
Shandon D. Hart ◽  
Yoel Fink
Keyword(s):  
Optical Fibers ◽  
Interfacial Energy ◽  
Photonic Bandgap ◽  
High Energy ◽  
Fused Silica ◽  
Organic Polymer ◽  
Microstructured Fiber ◽  
Microstructured Fibers ◽  
Fiber Fabrication ◽  
Single Material

ABSTRACTThe recently expanding field of microstructured optical fibers relies on the controlled fabrication of sub-micron features in a fiber drawn in the viscous fluid state. Microstructured fibers have generated great interest owing to their potential in areas such as photonic bandgap guidance of light in low-index media; high-energy laser transmission; and unique control over waveguide non-linearities, dispersion and modal properties [1–6]. These fibers have been made from a single material with air holes [7, 8] and as multi-material ‘composite’ fibers where air is not a part of the microstructured region [6, 9]. While single-material microstructured fibers generally rely on the established technology base of fused silica, the use of less conventional materials may enable applications not possible using silica [6]. Multi-material fibers may also present certain fabrication advantages due to their incompressible domains and simple cylindrical geometries. However, the use of more than one material raises questions about which types of materials can be combined in the drawing of a microstructured fiber. This problem can be approached by analyzing the relative importance of different materials properties such as viscosity, interfacial energy, and thermal expansion. In this study we focus on the effects of interfacial energy in composite microstructured fibers. We measure the interfacial energies at high temperature of a chalcogenide glass and an organic polymer recently employed in the fabrication of composite photonic bandgap optical fibers. We discuss the effect of interfacial energy during fiber draw, as well as the interplay between surface and viscous forces. Finally, we comment on the implications of this analysis for understanding what classes of materials can be used in composite microstructured fiber fabrication.

"Hybrid mode – linearly polarized optical vortex" transformation in multihelical optical fibers

2021 ◽  
Author(s):  
E. V. Barshak ◽  
D. V. Vikulin ◽  
B. P. Lapin ◽  
D. L. Puzankov ◽  
C. N. Alexeyev ◽  
...  
Keyword(s):  
Optical Fibers ◽  
Optical Vortex ◽  
Hybrid Mode ◽  
Linearly Polarized

scholarly journals Influence of attenuation on the generation of optical vortices in multihelicoidal optical fibers

2021 ◽  
Vol 2103 (1) ◽  
pp. 012149
Author(s):  
C N Alexeyev ◽  
S S Alieva ◽  
E V Barshak ◽  
B P Lapin ◽  
M A Yavorsky
Keyword(s):  
Optical Fibers ◽  
Fundamental Mode ◽  
Optical Vortex ◽  
Conversion Process ◽  
Exceptional Point ◽  
Optical Vortices ◽  
Attenuation Coefficients ◽  
Enhanced Sensitivity ◽  
Scalar Approximation ◽  
The Difference

Abstract In this paper we have studied influence of attenuation on conversion processes of the fundamental mode (FM) in multihelicoidal optical fibers (MHF) in the vicinity of the point of accidental spectrum degeneracy within the framework of the scalar approximation. To this end, we have obtained expressions for modes of the MHF, which consist of the FM and an optical vortex (OV), and shown that conversion of the FM into the OV takes place. The difference in the attenuation coefficients for the partial fields of MHF’s modes leads to deterioration in the conversion process even with an ideal system’s tuning. At sufficiently large values of attenuation coefficients the conversion of the incoming FM into the vortex vanishes. Also we have shown the presence of exceptional point (EP) in the spectra of modes of the MHF and demonstrated enhanced sensitivity of the fiber in the vicinity of the EP to perturbations.

scholarly journals Chalcogenide Microstructured Optical Fibers for Mid-Infrared Supercontinuum Generation: Interest, Fabrication, and Applications

2018 ◽  
Vol 8 (9) ◽  
pp. 1637 ◽  
Author(s):  
Yiming Wu ◽  
Marcello Meneghetti ◽  
Johann Troles ◽  
Jean-Luc Adam
Keyword(s):  
Optical Fibers ◽  
Infrared Imaging ◽  
Supercontinuum Generation ◽  
Mid Infrared ◽  
Microstructured Fibers ◽  
Research Fields ◽  
Infrared Spectral ◽  
Purification Methods ◽  
Imaging And Spectroscopy ◽  
High Coherence

The mid-infrared spectral region is of great technical and scientific importance in a variety of research fields and applications. Among these studies, mid-infrared supercontinuum generation has attracted strong interest in the last decade, because of unique properties such as broad wavelength coverage and high coherence, among others. In this paper, the intrinsic optical properties of different types of glasses and fibers are presented. It turns out that microstructured chalcogenide fibers are ideal choices for the generation of mid-infrared supercontinua. The fabrication procedures of chalcogenide microstructured fibers are introduced, including purification methods of the glass, rod synthesis processes, and preform realization techniques. In addition, supercontinua generated in chalcogenide microstructured fibers employing diverse pump sources and configurations are enumerated. Finally, the potential of supercontinua for applications in mid-infrared imaging and spectroscopy is shown.

7- and 19-Element-Core Bend-Resistant Microstructured Fibers

2008 ◽  
Vol 39-40 ◽  
pp. 261-264 ◽  
Author(s):  
K.V. Dukel`skii ◽  
A.V. Komarov ◽  
A.V. Khokhlov ◽  
E.V. Ter-Nersesyantz ◽  
V.S. Shevandin
Keyword(s):  
Optical Fibers ◽  
Short Wavelength ◽  
Main Role ◽  
Large Core ◽  
Optical Losses ◽  
Microstructured Fibers ◽  
Fiber Core ◽  
Central Elements

The conception of main role of the lattice pitch value in bend-induced short-wavelength optical losses is presented. There is shown that creation of the fiber core by substitution with seven or nineteen central elements leads to the essential expansion of spectral working range in microstructured large core optical fibers.

scholarly journals Stack and draw fabrication of soft glass microstructured fiber optics

2014 ◽  
Vol 62 (4) ◽  
pp. 667-682 ◽  
Author(s):  
D. Pysz ◽  
I. Kujawa ◽  
R. Stępień ◽  
M. Klimczak ◽  
A. Filipkowski ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Fiber Optics ◽  
Electronic Materials ◽  
Photonic Crystal Fibers ◽  
Microstructured Fiber ◽  
Microstructured Fibers ◽  
Soft Glass ◽  
Highly Nonlinear ◽  
Crystal Fibers ◽  
Light Guides

Abstract A broad review is given of microstructured fiber optics components - light guides, image guides, multicapillary arrays, and photonic crystal fibers - fabricated using the stack-and-draw method from various in-house synthesized oxide soft glasses at the Glass Department of the Institute of Electronic Materials Technology (ITME). The discussion covers fundamental aspects of stack-and-draw technology used at ITME, through design methods, soft glass material issues and parameters, to demonstration of representative examples of fabricated structures and an experimental characterization of their optical properties and results obtained in typical applications. Specifically, demonstrators include microstructured image guides providing resolution of up to 16000 pixels sized up to 20 μm in diameter, and various photonic crystal fibers (PCFs): index-guiding regular lattice air-hole PCFs, hollow core photonic bandgap PCFs, or specialty PCFs like highly birefringent microstructured fibers or highly nonlinear fibers for supercontinuum generation. The presented content is put into context of previous work in the area reported by the group of authors, as well as other research teams.

Optical vortices in fiber

Nanophotonics ◽  
2013 ◽  
Vol 2 (5-6) ◽  
pp. 455-474 ◽  
Author(s):  
Siddharth Ramachandran ◽  
Poul Kristensen
Keyword(s):  
Angular Momentum ◽  
Optical Fibers ◽  
Orbital Angular Momentum ◽  
Optical Vortex ◽  
Optical Vortices ◽  
New Class ◽  
Phase Singularities ◽  
Vortex Beams ◽  
Exotic Beams

AbstractOptical vortex beams, possessing spatial polarization or phase singularities, have intriguing properties such as the ability to yield super-resolved spots under focussing, and the ability to carry orbital angular momentum that can impart torque to objects. In this review, we discuss the means by which optical fibers, hitherto considered unsuitable for stably supporting optical vortices, may be used to generate and propagate such exotic beams. We discuss the multitude of applications in which a new class of fibers that stably supports vortices may be used, and review recent experiments and demonstration conducted with such fibers.

Heat Transfer Modeling of the Capillary Fiber Drawing Process

2017 ◽  
Vol 139 (7) ◽  
Author(s):  
Shicheng Xue ◽  
Geoffrey Barton ◽  
Simon Fleming ◽  
Alexander Argyros
Keyword(s):  
Heat Transfer ◽  
Optical Fibers ◽  
Analytical Study ◽  
Model Development ◽  
Fiber Surface ◽  
Experimental Program ◽  
Multiphase Model ◽  
Fiber Drawing ◽  
Microstructured Fibers ◽  
Two Stages

Considerable recent research has focused on the ability of microstructured fibers to exhibit diverse optical functionalities. However, accurately preserving the structure imposed at the preform stage after drawing it down to fiber, while avoiding Rayleigh–Plateau style instabilities, has proven to be a major fabrication challenge. This modeling/analytical study was carried out in support of an experimental program into possible fabrication options for various microstructured optical fibers and considers the generic case of the nonisothermal drawing of a capillary preform to fiber. Model development was carried out in two stages. Initially, a fully conjugate multiphase model, which includes all heat transfer modes within an operational fiber drawing furnace, was validated against available experimental data. To evaluate the external radiative heat flux using the net-radiation method, a Monte Carlo ray-tracing (MC-RT) method was coupled to the commercial polyflow package to obtain all view factors between the various furnace walls and the deforming preform/fiber. A simplified model was also developed (to shorten simulation run times) by explicitly calculating the convective heat transfer between the air within the furnace and the preform/fiber surface using a heat transfer coefficient determined by matching predicted results with those obtained from the multiphase model.

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