Home Forums SYSTEM how to get the exact value of jitter

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    • #16789
      Joseph Jiang
      Participant

      hi,everyone,i want to measure the jitter of my system.i know we can see the jitter by EYE DIAGRM,HOWEVER,I WANT TO KNOW THE EXACT VALUE OF THE JITTER?IS THERE ANYONE KNOW IT?THANK YOU!

    • #16797
      Joseph Jiang
      Participant

      can anybody help me?thank you in advance!

    • #16804
      Damian Marek
      Participant

      I think the intrinsic randomness of jitter might make it tough to calculate the exact jitter of a signal. The easiest way I understand how to find jitter is as you said the eye diagram.

      Here is an intro to measuring jitter in OptiSystem.

      Signal degradation – Jitter

      +1
      • #16829
        Joseph Jiang
        Participant

        OK,Thank you Damian.In my application(optical time transfer) ,i just want to measure the exact jitter of a signal.in many papers,they get the jitter using SNR with a function.however ,how can we achieve the SNR in a digital communication system.Damian,i really need your help!thank you!

        • #16834
          Damian Marek
          Participant

          Yea I think I read about that sort of empirical method for finding jitter. You can calculate the OSNR/SNR from the WDM Analyzer/Carrier Analyzer for both Optical and Electrical signals. Or you could do it from the spectrums and calculate it by hand.

          Regards

        • #16848
          Joseph Jiang
          Participant

          thank you!Damian!i just want to know how the optisystem calculate the electrical SNR when the signal is digital.as we know,in digital communication systems,we often use BER to calculate the performance rather than SNR.SO HOW THE optisystem calculate the SNR?thank you
          !

        • #16852
          Damian Marek
          Participant

          OptiSystem would only measure the BER of a digital signal. I am not sure how it is possible to calculate the SNR from a digital signal, except perhaps having some sort of plot of BER vs SNR as a reference.

          OptiSystem will calculate the SNR by directly comparing the spectral power distribution at the signal wavelength to the power distribution far away from the signal wavelength and thus representing noise.

        • #16855
          Joseph Jiang
          Participant

          hi damian,as we know ,if i moudulate the digital signal to the laser and demodulate with a PD,it is a digital communication system.i want to calculate the electrical SNR after receiving from PD.i know there is a device’Electrical Carrier Analyzer (ECAN)’which can calculate the electrical SNR.SO,can it calculate the SNR i want?or is it just calculate the SNR of anolog singal!thank you!

        • #16960
          Joseph Jiang
          Participant

          HI,damian,I am waitting for your reply?thank you!

        • #16986
          Damian Marek
          Participant

          Yes you can. The Electrical Carrier analyzer will directly compare the signal power to the noise bins power. Note: For the case of electrical SNR you need noise bins to run the calculation and so the global parameter “Convert Noise Bins” should not be checked.

          Sorry for the later reply the office was closed for the holidays.

          Regards

    • #17854
      mohammed mostafa
      Participant
    • #42894
      shivakumar rjgr
      Participant

      hello everyone,
      i HAVE BEEN WORKING ON WDM SYSTEMS.I WANT TO MEASURE THE TIMING JITTER OF THE SYSTEM. PLEASE EXPLAIN TO MEASURE THE JITTER VALUE FROM EYE DIAGRAM. IN RESULTS OF BER ANALYSER, THERE IS A VALUE NAMED ” RMS JITTER AT USER DEFINED THRESHOLD”, COULD IT BE THE JITTER VALUE OF THE SYSTEM.PLEASE HELP

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