- This topic has 7 replies, 5 voices, and was last updated 10 years, 5 months ago by
Alessandro Festa.
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April 22, 2015 at 5:56 pm #20063
mai fouad
ParticipantI use 100 Gb/s QPSK signal transmitted over 1000 km of SMF and the effect of non-linearity when calculating Q-factor appears at 3 dB when using non-linear coefficient n2=1e-19 ,Aeff=80 , are this parameters practical ? as the typical value of n2 around 3e-20 but it doesn’t affect the value of Q-factor (non linearity doesn’t appear).
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April 22, 2015 at 6:48 pm #20064
Abdallah Ismail
ParticipantIf the units of the values that you’ve mentioned above for n2 in m2/W and for Aeff in um2
you’ll find that gamma will be equal to 5 (1/(w.km)) and this a very large value that will affect Q factor.
The possible reason that i think,perhaps you use a DSP component that has a phase correction algorithm (CPE) which correct the phase error due to the nonlinearity and you should disable it in the DSP. -
April 22, 2015 at 11:49 pm #20066
Abhishek ShramaParticipantAbdallah i have n2= 26×10^-21 and Aeff =80 then how to calculate value x/Km/W???
What is formula to calculate Gamma??-
April 23, 2015 at 2:59 am #20072
Abdallah Ismail
ParticipantDear Abhishek Shrama,
I attached a picture for the formula
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April 23, 2015 at 5:19 am #20076
Abhishek ShramaParticipantcan we take vary value of gamma arbitrarily??
I saw it to be 1.3/km/w and 5 in some paper. can I change it ? -
April 23, 2015 at 6:00 am #20079
Abdallah Ismail
ParticipantIt is a characteristic of fiber depend on the manufacture
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June 11, 2015 at 6:34 am #21603
Ajay Vyas
ParticipantThanking you sir
this is very useful to solve my problem -
June 11, 2015 at 7:30 am #21607
Alessandro Festa
ParticipantDear Mai, you are not mentioning the launch power level into the fiber…if it is too low, Q-factor may not be affected by non-linearity.
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