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In the term mode coupling, as used in physics and electrical engineering, the word "mode" refers to eigenmodes of an idealized, "unperturbed", linear system. The superposition principle says that eigenmodes of linear systems are independent of each other: it is possible to excite or to annihilate a specific mode without influencing any other mode; there is no dissipation. In most real systems, however, there is at least ''some'' perturbation that causes energy transfer between different modes. This perturbation, interpreted as an interaction between the modes, is what is called "mode coupling". Important applications are: * In fiber optics〔See e.g. J. Zhao, X. Liu, ''Fiber acousto-optic mode coupling between the higher-order modes with adjacent azimuthal numbers'', Opt. Lett. 31, 1609-11 (2006); J. Thomas et al., ''Cladding mode coupling in highly localized fiber Bragg gratings: modal properties and transmission spectra'', Optics Express 19, 325-341 (2011).〕 * In lasers (compare mode-locking)〔See e.g. R. Paschotta, ''Mode coupling'', in the online ''Encyclopedia of Laser Physics and Technology'', https://www.rp-photonics.com/mode_coupling.html〕 * In condensed-matter physics, critical slowing down can be described by a Coupled mode theory.〔See e.g. W. Götze, ''Complex Dynamics of glass forming liquids. A mode-coupling theory'', Oxford: Oxford University Press (2009).〕 ==See also== *Nonlinear optics *Nonlinear acoustics *Equilibrium mode distribution 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「mode coupling」の詳細全文を読む スポンサード リンク
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