Home › Forums › SYSTEM › How to form Simulation model of WDM PON using downstream DQPSK & OOK upstream › Reply To: How to form Simulation model of WDM PON using downstream DQPSK & OOK upstream

Welcome,since you are asking about best modulation format then i would suggest you the DQPSK.However now all the modulation formats are like NRZ RZ DPSK MDRZ etc are provide different results and performance in different systems.Moreover you can try them by your own.lot of article you find on net regarding these formats and it is hard to find only one format to use which comes out best because different papers has differebt modulation format best according to scenario.For example if you kept non linearities off then Dpsk performs best and csrz mdrz also provide good results than Rz Nrz due to less prone to dispersion and are bandwidyh efficient .But where you consider non linearities ,trend become opposite ,here Rz performs better due to less prone to non linearities but yes more dispersion and bw requirements.So there is trade off between these .As i have seen many papers on PON and maximum use DQPSk has been analyzed for NG PONS .
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