- This topic has 5 replies, 3 voices, and was last updated 9 years, 8 months ago by
alistu.
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- October 1, 2015 at 3:31 pm #25625
Shahbaz Qureshi
ParticipantWhich 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.
- October 1, 2015 at 5:37 pm #25627
MHD NAParticipantHi 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,
- October 2, 2015 at 5:29 am #25651Participant
Thanks Namera. Is the eye diagram attached for RZ appropriate? It forms X type of shape below or it can be like this aswell?
- October 2, 2015 at 6:05 am #25652
alistuParticipantHi 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
- October 2, 2015 at 6:36 am #25654Participant
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.
- October 2, 2015 at 6:41 am #25659alistuParticipant
It seems to be acceptable. The eye opening is good, and the Q-factor obtained also shows this. I have attached a file in you other topic regarding RZ signal modulation scheme which might be of more help to you. Please have a look at it here: https://optiwave.com/forums/topic/eye-diagram-for-rz/#post-25657
Regards
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