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Full Name | boldoo |
Organization | school of ICT |
Job Title | student |
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my schema is attached. Eye diagram is seems like very big. is there any way to correct it?
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yeah, me too. I don’t really understand principle about BER in optisystem. if you got answer, pls share me. Thx
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is there must be DSP when I want to get BER and eye-diagram?
for star-16QAM, there is no DSP in Optisystem. how can I get almost real values for BER?
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Amplifier 2 db is too low. it should more than 10dB, right? what does it mean Power parameter of Receiver?
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first amplifier is 0db. second amplifier is 2dB through 16km fiber. you mean it is too low?
how to set sensitivity limits?
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Hi Damian,
please check attached project. i created 16APSK signal after modulator. But After fiber and amplifier, constellation is very bad. is there any way to keep constellation as possible? what components was wrong ?
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thanks Damian,
now that 16QAM pass through fibers, constellation is rotated as certain phase. but i can’t fix this to correct phase. You can see another post of mine.
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thanks sir
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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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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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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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I’m using revision 13. do you remember which parameters set? and how about components ? amplifier, filter.. is that enough?
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yes, reference wavelength is 1550nm at TX, RX and fiber and filters. same
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I’m trying to apply 16QAM.
after transmitter, connected to amplifier and Gaussian filter then 50km fiber, then amplifier and filter.
After second filter, I checked 16QAM coherent Receiver and Constellation Visulaizer.
but result is like attached.
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Dears, since I need to draw 16QAM constellation, I asked about 2ASK. then I drew attached fig.
is it 16QAM right? there is any requirement?