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I Single-mode optical fibre output not Gaussian?

  1. Apr 28, 2017 #1
    Is there anything that would make a single mode fibre's speckle pattern not look Gaussian? I've attached two images (below)

    The Fibre C speckle pattern looks multimode
    The Fibre A speckle pattern doesn't really look convincingly like multimode or like single mode.

    A HeNe laser was used to transmit light through the fibres
     

    Attached Files:

  2. jcsd
  3. May 3, 2017 #2
    Thanks for the thread! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post? The more details the better.
     
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