constellation map after 50km
after 50km optical transmission, how to keep constellation map as possible clear?
For example, 4APSK signals generated by modulator. I can see it by Constellation visualizer. Mr.Damian knows it.
I added 50km fibers and filters. but result is so bad. I tried as 1km fiber, but signal rotated almost -45 degree.
what parameter should be consider in case of 50km? or 80. How to keep clear signal?
if you have some idea, pls kindly share
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