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Equilibrium mode distribution

About: Equilibrium mode distribution is a research topic. Over the lifetime, 928 publications have been published within this topic receiving 14939 citations.


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Journal ArticleDOI
TL;DR: In this article, a bypass waveguide mode order converter, whose structure is a dielectric waveguide which divides into two branches that later unite with small dividing and uniting angles, is studied experimentally.
Abstract: The mode conversion characteristics of a bypass waveguide mode order converter, whose structure is a dielectric waveguide which divides into two branches that later unite with small dividing and uniting angles, are studied experimentally. The working principle of the mode order converter is based on adiabatic mode propagation in the branching waveguide. The features of the device are: 1) it can realize multimode order conversions at the same time, and 2) it does not require phase matching between coupled modes, which relieves the severe tolerance restriction placed on the conventional mode converter with uniform waveguide parameters.

11 citations

Journal ArticleDOI
TL;DR: In this paper, the conditions of excitation and the waveguide characteristics were determined in an analytical form for the TM0 mode of a planar waveguide with metal substrate, which has a surface character, in contrast to other (bulk) modes excited in the system.
Abstract: The conditions of excitation and the waveguide characteristics are determined in an analytical form for the TM0 mode of a planar waveguide with metal substrate. This mode has a surface character, in contrast to other (bulk) modes excited in the system. The propagation and damping constants and the energy flux density distributions are compared for the TM0 and TE0 modes.

11 citations

Journal ArticleDOI
TL;DR: In this paper, the authors theoretically investigate optical coupling between a waveguide and a localized mode arising in a cavity resonator of a two-dimensional photonic crystal and evaluate coupling efficiency by observing whispering gallery mode decaying through the waveguide.
Abstract: We theoretically investigate optical coupling between a waveguide and a localized mode arising in a cavity resonator of a two-dimensional photonic crystal. By carrying out two-dimensional finite-difference time-domain calculations, we evaluate coupling efficiency by observing whispering gallery mode decaying through the waveguide. Calculated coupling efficiency shows periodical change with change of waveguide width. We found that the coupling becomes strong when group velocity of the relevant waveguide mode is small. This correlation between the coupling efficiency and waveguide mode indicates that we can widely tune the coupling efficient by small change of structural parameters.

11 citations

Proceedings ArticleDOI
28 Jun 2004
TL;DR: In this article, an initial value problem is formulated for a threedimensional wave packet in a hypersonic boundary layer flow, and the problem is solved using a Laplace transform with respect to time and Fourier transforms in respect to the streamwise and spanwise coordinates.
Abstract: An initial-value problem is formulated for a threedimensional wave packet in a hypersonic boundary layer flow. The problem is solved using a Laplace transform with respect to time and Fourier transforms with respect to the streamwise and spanwise coordinates. The solution can be presented as a sum of modes consisting of continuous and discrete spectra of temporal stability theory. Two discrete modes, known as Mode S and Mode F, are of interest since they may be involved in a laminar -turbulent transition scenario. The continuous and discrete spectrum are analyzed numerically, and the following features are revealed: (1) the synchronism of Mode S with acoustic waves at low wave number is primarily twodimensional; (2) at high angles of dis turbance propagation, Mode F is no longer synchronized with entropy and vorticity waves; (3) at high angles of di sturbance propagation, the synchronism between Mode S and Mode F no longer leads to a Mode S instability, and at even higher angles of disturbance propagation, Mode S and Mode F are not synchronized.

11 citations

Journal ArticleDOI
TL;DR: In this paper, an analytic connector loss model for step-index polymer optical fibers (SI-POF) is presented, which describes the non-linear dependencies for combinations of the most important intrinsic and extrinsic influence parameters like Fresnel reflections, mismatches in numerical aperture (NA) and core diameters, as well as lateral, longitudinal and angular offsets.
Abstract: The authors report on an analytic connector loss model for step-index polymer optical fibers (SI-POF). The model describes the non-linear dependencies for combinations of the most important intrinsic and extrinsic influence parameters like Fresnel reflections, mismatches in numerical aperture (NA) and core diameters, as well as lateral, longitudinal and angular offsets. As connector losses strongly depend on the mode distribution, expressions for the mode-dependent coupling efficiencies for the various influence parameters are derived. This way, the model can handle any rotationally symmetric mode distribution including the uniform mode distribution (UMD) and the equilibrium mode distribution (EMD) in the steady-state. It is shown that for step-index fibers, lateral and longitudinal offsets can be handled in a similar way, which reduces the overall effort for the mathematical description. For the typical case of identical fibers, the authors also derive easy-to-apply approximations for a combination of lateral and longitudinal offsets under UMD and EMD conditions. The results are in good agreement with ray-tracing simulations and are evaluated for the cases of identical fibers and the worst case parameter constellation for the SI-POF in the IEC A4a.2 fiber class.

11 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20235
202212
20218
20205
20191
20183