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Radiation mode

About: Radiation mode is a research topic. Over the lifetime, 4382 publications have been published within this topic receiving 68967 citations.


Papers
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Journal ArticleDOI
TL;DR: In this paper, the effect of the perturbation on the pulse is to excite radiation at a frequency inversely proportional to the small parameter ε, and the amplitude of the radiation is exponentially small.
Abstract: Nonlinear pulse propagation at the zero group-dispersion wavelength is studied analytically. It is discovered that, after the characteristic initial frequency splitting, evolution of the pulse envelope that is shifted down to the anomalous regime is described by the nonlinear Schr\"odinger equation with higher-order dispersion as a perturbation. The effect of the perturbation on the pulse is to excite radiation at a frequency inversely proportional to the small parameter \ensuremath{\beta}. The amplitude of the radiation is exponentially small (\ensuremath{\propto}exp(-1/\ensuremath{\beta})] and can be calculated only by the perturbation method that goes beyond all orders.

212 citations

Journal ArticleDOI
TL;DR: Numerically studying the possibilities for improved large-mode-area endlessly single-mode photonic crystal fibers for use in high-power delivery applications finds that a triangular core formed by three missing neighboring air holes considerably improves the mode area and loss properties compared with the case with a core formed with one missing air hole.
Abstract: We numerically study the possibilities for improved large-mode-area endlessly single-mode photonic crystal fibers for use in high-power delivery applications. By carefully choosing the optimal hole diameter, we find that a triangular core formed by three missing neighboring air holes considerably improves the mode area and loss properties compared with the case with a core formed by one missing air hole. In a realized fiber we demonstrate an enhancement of the mode area by ∼30% without a corresponding increase in the attenuation.

204 citations

Patent
04 Oct 2001
TL;DR: In this article, a dual-band multimode coaxial antenna feed has an inner section of longitudinal hollow waveguide having first and second orthogonal mode transducers that interface orthogonally polarized cylindrical waveguide TE11 mode signals lying in a first upper (e.g.,Ka) frequency band.
Abstract: A dual band multimode coaxial antenna feed has an inner section of longitudinal hollow waveguide having first and second orthogonal mode transducers that interface first and second orthogonally polarized cylindrical waveguide TE11 mode signals lying in a first upper (e.g.,Ka) frequency band. An outer coaxial waveguide section has a Potter horn surrounding the inner waveguide section, which terminates at a polyrod. The outer section includes third and fourth orthogonal mode transducers that interface orthogonally polarized coaxial waveguide TE11 mode signals lying in a second lower (e.g.,X) frequency band. A tracking port coupled to the outer coaxial waveguide section provides an output representative of the difference pattern of the radiation profile produced by transverse electromagnetic TEM mode signals generated and propagating in the outer coaxial waveguide. A mode supressor in the outer waveguide section adjacent its two orthogonal mode transducers locally supresses TEM signals in their vicinity.

197 citations

Journal ArticleDOI
TL;DR: This work presents a scheme to realize a controllable, scalable, low-cost, and versatile all-fiber orbital angular momentum (OAM) converter that consists of a two-mode fiber with its input terminal welded with a single- mode fiber, a mechanical long-period grating, metal flat slabs, and a fiber polarization controller.
Abstract: We present a scheme to realize a controllable, scalable, low-cost, and versatile all-fiber orbital angular momentum (OAM) converter. The converter consists of a two-mode fiber (TMF) with its input terminal welded with a single-mode fiber, a mechanical long-period grating (LPG), a mechanical rotator, metal flat slabs, and a fiber polarization controller. The LPG is employed to convert the fundamental fiber mode to higher-order modes and the flat slabs are used to stress the TMF to adjust the relative phase difference between two orthogonal higher-order modes. Selective conversion from the LP(01) mode to the LP(11a), LP(11b), OAM(-1), or OAM(+1) mode is demonstrated in the experiment.

194 citations

Journal ArticleDOI
TL;DR: It is demonstrated that it is possible to overcome the undesirable effects caused by the TE(1) mode's inherent low-frequency cutoff, making it a viable THz wave-guiding option, and that for certain applications, theTE( 1) mode may even be more desirable than the TEM mode.
Abstract: We present a comprehensive experimental study comparing the propagation characteristics of the virtually unknown TE(1) mode to the well-known TEM mode of the parallel-plate waveguide (PPWG), for THz pulse applications. We demonstrate that it is possible to overcome the undesirable effects caused by the TE(1) mode's inherent low-frequency cutoff, making it a viable THz wave-guiding option, and that for certain applications, the TE(1) mode may even be more desirable than the TEM mode. This study presents a whole new dimension to the THz technological capabilities offered by the PPWG, via the possible use of the TE(1) mode.

192 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202316
202221
20215
202021
201933
201821