QPSK CONSTELLATION - Optiwave

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This topic has 3 replies, 2 voices, and was last updated 5 years, 2 months ago by Ahmad Atieh.

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- February 6, 2019 at 4:11 am #50463
  KRISHIKA NANDHINI N
  Participant
  HELLO EVERYONE
  I HAVE USED QPSK MODULATOR FROM EXAMPLES GIVEN IN OPTISYSTEM 15 TO MODULATE OPTICAL FREQUENCY COMB. I AM NOT GETTING A PROPER CONSTELLATION DIAGRAM.I HAVE REPLACED CW LASER WITH OPTICAL FREQUENCY COMB.
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- February 6, 2019 at 7:13 am #50466
  
  Ahmad Atieh
  Moderator
  
  Hello,
  Do you have DSP in your example?
  
  It looks that the DSP is not there or it is not set properly.
  Regards,
  Ahmad
- February 6, 2019 at 10:31 pm #50470
  
  KRISHIKA NANDHINI N
  Participant
  
  Thanks for your reply.
  
  we have used dsp. what are the properties to be set?
- February 7, 2019 at 8:49 am #50474
  
  Ahmad Atieh
  Moderator
  
  Hello,
  As I don’t have your project layout. I would guess that you need to make sure that the DSP is set correctly to compensate for dispersion and nonlinearity if there is fiber in the system and experience these physical effects. Also, you may adjust the parameters in the adaptive filtering in the DSP component.
  
  Regards,
  Ahmad
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