difference in BER values in same optisystem file - Optiwave

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This topic has 2 replies, 2 voices, and was last updated 7 years, 8 months ago by Damian Marek.

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- March 26, 2017 at 7:36 am #42859
  
  adnan sabbar
  Participant
  
  Hello
  I used two methods to calculate BER for a NRZ modulation format (attached)
  1- BER test set
  2- BER analyzer
  
  But unfortunately they give quite different values.
  May anyone help me to know the reasons and help me to solve this problem please ?
  I am using optisystem 14.1 trail version 64 bit
- March 26, 2017 at 7:38 am #42860
  
  adnan sabbar
  Participant
  
  sorry, you can find the file below
- April 7, 2017 at 9:24 am #42947
  
  Damian Marek
  Participant
  
  Adnan,
  
  Interesting! First time I have seen this pop up. The problem came from the Data Recovery component. The default parameters (or maybe parameters that you set) were not optimal. In the BER Analyzer the results show that the MIN BER can be calculated at a threshold of about ~8.3E-5 A.U. with a decision instant of ~0.53. I simply copied these settings into the Data Recovery component and got 0 Bit Errors at the BER Test Set and complete agreement.
  
  The BER Test Set works by comparing input and output bit sequences, so it does not really “know” what the signal quality is like. You have to make sure that you have all the detection side working exactly.
  
  Regards,
  Damian
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