Home Forums BPM Coupling efficiency – overlap integral

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      Didier Duprat

      Hello everyone,

      In the first part of a project I am modeling a butt coupling between two single mode fibers in 2D et 3D.
      The first part is really simple, I observe the coupling efficiency versus the gap length between the two fibers. This is a well known configuration, there are even analytical solutions for Gaussian beams.
      The problem is that in this simple case the results of analytical solutions and those obtained with BPM are very different: for a gap of 150µm, the calculations give me 30% of efficiency whereas OptiBPM is around 60%.
      In the analyzer I look at the “power in output waveguides”.
      Do you know why these results could be so different?
      Thanks for your help.

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