Results 261 to 270 of about 316,985 (297)

Multiple coupling length nonlinear directional couplers with variable coupling coefficient

Optics Communications, 2003
Multiple coupling length nonlinear directional couplers (NLDCs) with variable coupling coefficient (VCC) are investigated. As examples, two kinds of VCC NLDCs, exponential and Gaussian VCC NLDCs, are numerically simulated. Both couplers show multiple-switching feature and have eminent digital switching characteristic. In addition, the Gaussian VCC NLDC
Gang Jun Liu, Bin Min Liang, Qu Li, Guo Liang Jin   +3 more
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Coupling length and coupling loss in AlGaAs photonic crystal waveguides

Journal of Optics, 2016
In this work, we present the theoretical simulation results of a two parallel plasmonic waveguides structure with same geometries. There is a low-index semiconductor AlGaAs layer between the GaAs layer and the metal layer. The coupling length and coupling loss are calculated at the telecom wavelength (1550 nm) for different structures by employing the ...
openaire   +1 more source

Optimum coupling junction and cavity lengths for coupled-cavity semiconductor lasers

Journal of Applied Physics, 1985
In this paper we investigate the dependence of the mode suppression in coupled-cavity semiconductor lasers on coupling junction parameters and cavity lengths. An effective mirror formalism is developed and combined with exact numerical analysis to explore the mode behavior across the entire relative cavity gain operating range of coupled-cavity ...
T. L. Koch, L. A. Coldren
openaire   +1 more source

System Benefits of Coupled-Core Multicore Fibers with Different Coupling Lengths

Conference on Lasers and Electro-Optics, 2018
We study the impact of the linear coupling length and the number of cores on the nonlinear benefit of the coupled-core multicore fiber having up to 19 cores. Coupling lengths as short as a few meters improves transmission.
René-Jean Essiambre, Roland Ryf, Georg Rademacher   +2 more
openaire   +1 more source

Concurrent coupling of length scales: Methodology and application

Physical Review B, 1999
A strategic objective of computational materials physics is the accurate description of specific materials on length scales approaching the meso and macroscopic. We report on progress towards this goal by describing a seamless coupling of continuum to statistical to quantum mechanics, involving an algorithm, implemented on a parallel computer, for ...
Jeremy Q. Broughton, Farid F. Abraham, Noam Bernstein, Efthimios Kaxiras   +3 more
openaire   +1 more source

Ferrite coupled-line circulator with reduced length

IEEE Transactions on Microwave Theory and Techniques, 2005
A method to design a circulator based on a ferrite coupled line (FCL) with reduced length is presented. This is achieved by appropriate matching networks. Using ferrite perturbation theory, we derive closed-form expressions for the required matching impedances and the resulting bandwidth of the matched device. Based on this analysis, a realistic design
null Meng Cao, R. Pietig
openaire   +1 more source

Theory of mode-coupling in the length-modulated laser

1967 International Electron Devices Meeting, 1967
Laser mode coupling induced by internal time-varying perturbation of the optical cavity has been the object of much interest in recent years. It has been shown also that a laser can be phase locked by moving one of its mirrors at a frequency near the axial made interval.
O.P. McDuff, A.L. Pardue
openaire   +1 more source

Asymptotic and finite-length performance of irregular spatially-coupled codes

2014 IEEE International Black Sea Conference on Communications and Networking (BlackSeaCom), 2014
The newest family of low-density parity-check (LDPC) codes, spatially-coupled (SC) codes, is shown to have several desirable characteristics including low implementation complexity and close-to-optimal performance over a range of channels. Furthermore, because of their ribbon-shaped parity-check matrices, window decoding can be used to decode these ...
Reza A. Ashrafi, Abdullah Sariduman, Ali Emre Pusane   +2 more
openaire   +1 more source

Enhancing coupling efficiency and propagating length for surface plasmon polaritons

Applied Optics, 2010
A high coupling efficiency and long propagating length technique is suggested for surface plasmon polaritons (SPPs). An attenuated total reflection (ATR) mode is employed to enhance the coupling efficiency by SPPs resonating with the incident light in the SPP launching zone. In the SPP transmitting zone, a step-metal film is embedded in a dielectric to
Huimin, Liang, Jingquan, Wang
openaire   +2 more sources

Theoretical Analysis of Run Length Distributions for Coupled Motor Proteins

The Journal of Physical Chemistry B, 2019
Motor proteins, also known as biological molecular motors, play important roles in various biological processes. In recent years, properties of single-motor proteins have been intensively investigated using multiple experimental and theoretical tools. However, in real cellular systems biological motors typically function in groups, but the mechanisms ...
Qian Wang, Anatoly B. Kolomeisky
openaire   +3 more sources