Home Forums SYSTEM difference in BER values in same optisystem file

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    • #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

    • #42860
      adnan sabbar
      Participant

      sorry, you can find the file below

      +1
    • #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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