Journal ArticleDOI
Helical core optical fibers maintaining propagation of a solitary optical vortex
TLDR
In this article, the authors studied the mode structure of few-mode core optical fibers with small (up to a wavelength order) values of the helix pitch and showed that at certain values of pitch, the fundamental $H{E}_{11}$ mode strongly hybridizes with $l=1$ optical vortices and the forbidden zone appears in the spectra of such hybrid modes, which results in their attenuation.Abstract:
We study theoretically the mode structure of few-mode helical core optical fibers with small (up to a wavelength order) values of the helix pitch. We demonstrate that in such fibers, at certain values of pitch the fundamental $H{E}_{11}$ mode strongly hybridizes with $l=1$ optical vortices and the forbidden zone appears in the spectra of such hybrid modes, which results in their attenuation. We have shown that within the spectrum gap, the only forward-propagating guiding modes are represented by two circularly polarized optical vortices with opposite polarization and the same topological charge so that upon excitation of such a fiber with a circularly polarized beam, only a solitary optical vortex could be excited in it. Such ``monovortex'' fibers are found to be analogous to conventional monomode fibers that maintain the propagation of the $H{E}_{11}$ mode.read more
Citations
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Journal ArticleDOI
Generation and Conversion of Higher Order Optical Vortices in Optical Fiber With Helical Fiber Bragg Gratings
TL;DR: In this paper, the authors proposed an effective method to generate high-order optical vortices (OVs) using H-FBG written in a multimode fiber with conversion efficiency as high as 97%.
Journal ArticleDOI
Generation and conversion of optical vortices in long-period helical core optical fibers
C N Alexeyev,Maxim A. Yavorsky +1 more
TL;DR: In this paper, the authors theoretically study the generation and conversion of optical vortices in long-period helical core fibers (HCFs) produced by drawing from a perform with an eccentric core.
Journal ArticleDOI
Flexible generation/conversion/exchange of fiber-guided orbital angular momentum modes using helical gratings.
Liang Fang,Jian Wang +1 more
TL;DR: In this article, the authors proposed a method of generation, conversion, and exchange of fiber-guided OAM modes using helical gratings (HGs), which is flexible and well compatible with OAM fibers, featuring a high conversion efficiency close to 100% and a conversion bandwidth about 10nm in transmission spectra, while less than 1nm in reflection spectra.
Journal ArticleDOI
Mode-division multiplexing in fibre-optic communications based on orbital angular momentum
TL;DR: In this article, the authors investigated the possibility of using optical vortices with different values of topological charge l, and hence with different value of the orbital angular momentum (OAM), for mode-division multiplexing in optical fibres.
Journal ArticleDOI
Flexible generation conversion and exchange of fiber guided orbital angular momentum modes using helical gratings
Liang Fang,Jian Wang +1 more
TL;DR: In this article, a method of generation, conversion, and exchange of fiber-guided orbital angular momentum (OAM) modes using helical gratings (HGs) is proposed.
References
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Journal ArticleDOI
Three-dimensional horizontal circular spiral photonic crystals with stop gaps below 1μm
TL;DR: In this paper, three-dimensional photonic crystals with a circular spiral architecture were fabricated by direct laser writing (DLW) in a photoresist with a laser beam having the direction of propagation and elongation of the ellipsoidal focal region perpendicular to the spirals orientation.
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Double-helix chiral fibers.
Victor I. Kopp,Azriel Z. Genack +1 more
TL;DR: A polarization-selective photonic stop band is demonstrated in a new chiral fiber structure with double-helix symmetry and observations in single-mode fibers are in good agreement with one-dimensional simulations of a dispersive cholesteric material.
Journal ArticleDOI
Bandwidth-tunable band-rejection filter based on helicoidal fiber grating pair of opposite helicities
TL;DR: In this article, a new type of all-fiber band-rejection filter consisting of a helicoidal long-period fiber grating pair of opposite helicities, which provides highly flexible spectral control over the rejection bandwidth was developed.
Journal ArticleDOI
Light coupling by a vortex lens into graded index fiber
TL;DR: In this paper, a diffractive optical element in conjunction with a single mode fiber to match a graded index fiber was used to improve the coupling into the skew rays of the SIFT.
Journal ArticleDOI
Optical vortices and the higher order modes of twisted strongly elliptical optical fibres
C N Alexeyev,Maxim A. Yavorsky +1 more
TL;DR: In this paper, the structure of the higher order modes in uniformly twisted weakly guiding strongly elliptical optical fibres is investigated based on the effective reduction of a twisted fibre equation to a straight fibre one.