- This topic has 7 replies, 4 voices, and was last updated 9 years, 5 months ago by
Alessandro Festa.
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AuthorPosts
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October 9, 2015 at 9:30 am #26090
koll
ParticipantSignal Degradation in optic fiber are caused by noise,attenuation and dispersion?
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October 9, 2015 at 9:35 am #26091
alistu
ParticipantHi Koll,
Yes! And also by the nonlinear effects. When the optical power injected into the optical fiber is high, these effects show a considerable effect. You might have heard of self-phase modulation (SPM), cross-phase modulation (XPM) and the four-wave mixing (FWM) as some examples of nonlinear effects.
Regards
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October 9, 2015 at 9:37 am #26092
koll
ParticipantHi Alistu but from the link here I googled.
why they only mentioned attenuation and dispersion?
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October 9, 2015 at 9:47 am #26095
alistu
ParticipantOn the second page from the file you have uploaded, it can be seen that the transmission effects are divided into two categories, one being nonlinear effects. And the three examples I have mentioned are also among the nonlinear effects. I don’t know why it has not been mentioned on the first page, but on the second page those two factors are also mentioned.
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October 9, 2015 at 9:51 am #26096
koll
ParticipantSo noise are consider as non linear effect?
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October 12, 2015 at 2:42 am #26237
Alessandro Festa
ParticipantNoise is usually considered a linear effect (eg: ASE from optical amplifiers). Anyway, there are propagation models where the noise itself incorporates both linear and nonlinear effect, like the GN-model.
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October 9, 2015 at 10:16 am #26097
alistu
ParticipantI believe both nonlinear effects and the dispersion effect (which may degrade signal by causing inter-symbol interference) can be considered as noise in the transmission line. I don’t know if in the above lecture the nonlinear effects have been considered as the noise factor in the optical fiber.
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October 10, 2015 at 1:31 am #26126
gaganpreet Kaur
Participanti would like to add non-linear effects become significant at high powers which are required for long distance transmission. also in case of multi-channel systems as the channel spacing id reduced non-linear effects cannot be ignored. rather for WDM systems XPM and FWM non-linear effects are most deteriorating. SPM( Single Phase modulation) is significant for single channel systems only.
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