> How many different modes can you put on a fiber???
  Singlemode fiber supports, as it's name indicates, one fundamental mode, 
which consists of two orthogonal polarization modes.
  Multimode fibers support more than 100 modes. 

  The problem is, we don't have the MIMO technology to deal with more than a 
few modes, so can't just use multimode fiber with all it's modes. 
  Most research concentrates of so called few-mode fibers with a total of six 
polarization and spatial modes. 


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