Equilibrium mode distribution
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The equilibrium mode distribution of light travelling in an optical waveguide or fiber, is the distribution of light that travels in the medium without any disturbance or leakage/gain.
The equilibrium length is the length of multimode optical fiber necessary to attain the equilibrium mode distribution for a specific excitation condition. Equilibrium length is sometimes used to refer to the longest such length, as would result from a worst-case, but undefined, excitation. Other terms for equilibrium length are equilibrium coupling length and equilibrium mode distribution length.
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