Home Forums GENERAL RZ vs NRZ

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    • #25625
      Shahbaz Qureshi
      Participant

      Which modulation format is better or suitable for Passive optical networks eg GPON or TWDM PON? Some papers tend to say RZ is better while NRZ is considered as a standard by ITU T.

    • #25627
      MHD NA
      Participant

      Hi Shahbaz;
      I think NRZ is better than RZ according to their performance in optical systems and that is clear by eye diagram that is clearer, when we use NRZ, than RZ (look at the attached photo) which makes Q- factor is bigger in NRZ.
      For more information about your question you can make a look on the attached file.

      Regards,

    • #25651
      Shahbaz Qureshi
      Participant

      Thanks Namera. Is the eye diagram attached for RZ appropriate? It forms X type of shape below or it can be like this aswell?

    • #25652
      alistu
      Participant

      Hi Shahbaz,

      Both have advantages and disadvantages. But NRZ encoding schemes are probably more convenient to use according to the current protocols and standards, so it is not just because NRZ might show better results.

      Source: http://teledynelecroy.com/serialdata/serialdatastandard.aspx?standardid=439

      Regards

    • #25654
      Shahbaz Qureshi
      Participant

      Thanks Alistu. I understand. But the eye diagram attached by Namera for RZ is acceptable? or does it always have to look like the attached one.

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