- This topic has 7 replies, 3 voices, and was last updated 10 years, 11 months ago by
Ravil.
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November 13, 2014 at 8:59 am #15324
boldooParticipantDear all,
attached pic is actually 16APSK, but it looks very bad cause of Dispersion effect. How can I fix this? is there any better way?
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November 13, 2014 at 2:09 pm #15422
Damian Marek
ParticipantHi Boldoo,
I simulated your project again with the fibers and amplifiers off and the constellation came out properly. Although I don’t think it is a traditional 16-PSK constellation it still looks good.
The fibers and amplifiers are the agents which cause the distortion here. Try a DCF to get a better result.
Regards
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November 13, 2014 at 6:56 pm #15558
Ravil
ParticipantI have a question about 2dB power level sent through 16km fiber to receiver: did you consider the sensitivity limits of your detector?
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November 14, 2014 at 6:44 am #15578
boldooParticipantfirst 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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November 14, 2014 at 9:19 am #15580
boldooParticipantAmplifier 2 db is too low. it should more than 10dB, right? what does it mean Power parameter of Receiver?
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November 14, 2014 at 10:33 pm #15610
Ravil
ParticipantNot exactly. I’m suggesting you to consider the level of overload signal for your receiver. The matter is that all receivers, in general, are working in dynamic range -15-25dB and if your input power will be bigger than higher limit, your receiver will become saturated which will bring you nonlinear distortion and information quality will degrade.
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November 14, 2014 at 10:36 pm #15611
Ravil
ParticipantLevels of 0dB and 2dB accordingly are used, in general, for fiber spans with length of 80-160km which gives power level at the receiver within the dynamic range…
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November 14, 2014 at 10:39 pm #15612
Ravil
ParticipantFor better explanation I can refer you book “Fiber optic communication” G. Agarwal…
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