Method for calculating coupling coefficient in W-type multimode optical fibers

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Original languageEnglish
Article number055102
Journal / PublicationLaser Physics
Issue number5
Online published20 Apr 2021
Publication statusPublished - May 2021


A simple method is proposed for determining the mode coupling coefficient D in W-type (double clad) multimode optical fibers. It only requires the observation of the far-field output pattern for one fiber length with the input light launched centrally along the fiber axis (θ0 = 0). For illustration, the coupling coefficient determined by this simple method for a W-type multimode glass optical fiber was used to calculate the coupling length Lc at which the equilibrium mode distribution is achieved.

Research Area(s)

  • mode coupling, coupling length, power flow equation, W-type optical fibers

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