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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, the effect of the mode structure of the pump waves and the length of the optical waveguide on phase conjugation quality with degenerate four-photon interaction in a parabolic waveguide with Kerr nonlinearity was studied.
Abstract: The effect of the mode structure of the pump waves and the length of the optical waveguide on phase conjugation quality with degenerate four-photon interaction in a parabolic optical waveguide with Kerr nonlinearity is studied. It is shown that the dependence of the overlap integral on the mode numbers of the interacting waves eliminates the possibility of ideal phase conjugation in “long” optical waveguides. As the length of the waveguide increases, the point-spread function, describing the quality of phase conjugation, is broadened and approaches some limiting form, determined by the mode structure of the pump waves. In “long” waveguides, if one of the pump waves is single-mode and the other is multimode, an increase in the mode numbers of multimode pumping affects only the contrast and symmetry of the converted image of a point. If, however, both pump waves are identical and multimode, then an increase of their mode number results in narrowing of the point-spread function.
Proceedings ArticleDOI
21 Dec 2022
TL;DR: In this paper , a mode stability map of the EDFRL scaled by pump coefficient is measured and discussed completely through the interferometer scheme, which helps to evaluate the mode stability dependent on pump power in a form of global visualization.
Abstract: Mode instability phenomenon acts as a common feature in single-frequency fiber ring lasers. Pump power and cavity length are two important control parameters affecting the output SLM stability. In this work, mode instability of an EDFRL has been experimentally investigated by utilizing two effective methods. On the whole, a mode stability map of the EDFRL scaled by pump coefficient is measured and discussed completely through the interferometer scheme, which helps to evaluate the mode stability dependent on pump power in a form of global visualization. Besides, real-time and detailed detection of various mode instability behaviors, including occasional mode hopping, periodic mode hopping and intermittent MLM oscillation, is carried out using the optical heterodyne scheme. The dynamics of mode instability can also be visualized by on-line time-frequency diagrams. This work will contribute to the analysis, understanding and suppression of mode hopping in fiber ring lasers.
Proceedings ArticleDOI
21 Apr 2008
TL;DR: In this article, a new simulation method for optical pulse distortion in macro-bends of single-mode optical fiber with coating layer is presented, showing that the pulse distortion can make bit errors for optical communication systems with high bit rate.
Abstract: A new simulation method for optical pulse distortion in macro-bends of single-mode optical fiber with coating layer is presented. The pulse distortion in macro-bends of standard single mode fibers are investigated theoretically, showing that the pulse distortion in macro-bends can make bit errors for optical communication systems with high bit rate. The simulation technique is validated by comparison with exact solution for macro-bend losses of standard single mode fiber.
Proceedings ArticleDOI
09 Jun 1999
TL;DR: In this article, a numerical analysis of the imperfect nonlinear optical fiber using the coupled mode theory and the split-step Fourier method is described, where the nonlinear fiber is divided into a large number of appropriate cylindrical segments, and the analysis of light propagation between two segments of various diameters is used.
Abstract: Numerical analysis of the imperfect nonlinear optical fiber using the coupled mode theory and the split-step Fourier method, is described. The nonlinear optical fiber is divided into a large number of appropriate cylindrical segments. In the analysis of light propagation between two segments of various diameters, the coupled mode theory is used. Propagation of a pulse, in the cylindrical nonlinear segment, is analyzed using the split-step Fourier method. Some results of computation of the real nonlinear optical fibers are also presented.
Journal ArticleDOI
TL;DR: In this paper, the authors analyzed the electromagnetic field distribution in a coupled waveguide system with two rectangular dielectric waveguides having one and two modes, respectively, in a parallel orientation.
Abstract: When Waveguide I supporting several guided modes and Waveguide II supporting a single mode are coupled in a parallel orientation, the electromagnetic field distributions in this coupled guided system are analyzed in such a way that the mode coupling is represented as a weighted sum of the guided modes. In general, when two waveguides are placed closer so that the coupling becomes stronger, the existence of one guide can no longer be neglected by the guided eigenmode of another guide, and its field distribution is perturbed. The method of analysis presented in this paper takes into account this effect by way of weighted expansion coefficients of the mode. Hence, the analysis can be applied even when the coupling is rather dense. As an example, the field distribution of the coupled guided system is analyzed for the case where two rectangular dielectric waveguides having one and two modes, respectively, are placed in parallel. Next, the field distribution along the coupled waveguide is measured and the spatial spectrum is analyzed. A characteristic spatial spectrum is found which is proportional to the difference of the phase constants of the three eigenmodes. It is found that this corresponds to the difference of phase constants of each mode obtained analytically. The present analysis method can readily be extended to the case in which each of the coupled waveguides has multiple guided modes, including the case where both have only one mode. The theory can be used for the design of couplers, dividers, and mode filters made of dielectric waveguides.

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