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Why BER Analyzer is not showing graph for all sweep values

Home › Forums › SYSTEM › Why BER Analyzer is not showing graph for all sweep values

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    • December 3, 2014 at 2:25 am #16355
      Ibn Aziz
      Participant

      Hi every one !
      Hope u r fine !

      I am working on a project in which i have to find BER. i m attaching the file below.

      Problem is that when i sweep optical fiber distance from 0.5 to 3 km then BER analyzer do not show any graph for all values except 3Km.

      I am not getting Y this happening ?? (i.e Y BER analyzer not showing graph for all sweep values)

      I have also done sweep between 3 to 5 km, the same behaviour happens except this time i got min BER graph from BER analyzer for just two instances i.e 3 km and 3.444 km.

      if anyone know Y this happens ? and Y BER analyzer is behaving like that plz share, it wil be useful for all.

      I wil be very thak ful u.

      Best Regards

    • December 3, 2014 at 9:07 pm #16390
      Joseph Jiang
      Participant

      I HAVE TRIED IT AS THE RUSULT ATTACHEND

    • December 3, 2014 at 11:47 pm #16394
      Ravil
      Participant

      Are you using bidirectional fibers? Can you also attach the scheme you are using?

    • December 4, 2014 at 5:28 am #16396
      Ibn Aziz
      Participant

      No ravil i m not using bidirectional fibers. i am just using NRZ , u can see every thing in attachment as above

    • December 4, 2014 at 5:32 am #16397
      Ibn Aziz
      Participant

      Ravil have u any info hw to solve this problem, as stated in below topic link…….

      How to Enhance Resolution of measured values in "RF Spectrum Analyzer"

      i.e hw can i see side bands in Rf spectrum analyser, as i have 3 bands in optical spectrum analyzer but rf spectrum analyzer shows only one ??

      kindly go through this above link and share ur knowlegde if u know how to solve this problem.

      Regards

    • December 5, 2014 at 8:50 am #16419
      Damian Marek
      Participant

      I think the main problem is with the filters. Switching the last filter for a 1 GHz cutoff (your bit rate is at 0.768 GHz) I got a better eye diagram.

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