Constellation map phase shift - Optiwave

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This topic has 1 reply, 2 voices, and was last updated 9 years, 5 months ago by Damian Marek.

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- November 12, 2014 at 10:51 am #15265
  boldoo
  Participant
  Hi all,
  
  I configured 16QAM transmitter and fiber, filter, DCFiber and receiver. But in receiver, constellation map phase shifted.
  
  i think reason is dispersion of fiber. right?
  
  how to restore square 16QAM? which parameter affecting to phase shift? please share me your idea.
  
  please check photo
  Attachments:
  phase-shifted.png
- November 12, 2014 at 11:36 am #15279
  
  Damian Marek
  Participant
  
  Rotation of the diagram is due to an ordered phase shift. You can use a Digital Signal Processing component to reset the phase or you could manually add your own phase shift component and set it to rotate the constellation back to the correct position.
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