constellation map after 50km
dear all,
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
Responses (8):
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dear all,
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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Did you match the reference signal wavelength in the fiber with transmitter and receiver wavelength?
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yes, reference wavelength is 1550nm at TX, RX and fiber and filters. same
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I remember I had this problem with 100G DP-QPSK but revision 13 solved it. Are you using 13 or 12?
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I’m using revision 13. do you remember which parameters set? and how about components ? amplifier, filter.. is that enough?
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when I deselect “group velocity dispersion” and “third-order dispersion”, constellation map showed almost clear. just attenuated.
do you have idea about to correct the dispersion? need other components?
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Yes, I exactly need Dispersion compensating fiber. DCF. In optisystem, i didn’t find it.
if you know it, please share me
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Hi Boldoo,
You can use a regular optical fiber component but manually change the dispersion. As in the attached project.
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thank you dears but it can’t change phase shift. I posted another forum, please review it.
thanks
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