nagative eye opening penality

hi umer syed …
yoou can get clear view of eye opening after going through these links..

https://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&cad=rja&uact=8&ved=0ahUKEwi_kqW3hLbLAhXCj44KHWiZAYAQFggiMAE&url=http%3A%2F%2Foptiwave.com%2Fwp-content%2Fuploads%2F2015%2F06%2FAND9075-D.pdf%3Fb82c69&usg=AFQjCNGKHCJi9da1JjS1Ax_KGC9vrTbenw&sig2=gtMooAWs0o1n4Xoce2RGOA&bvm=bv.116573086,d.c2E

https://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwi_kqW3hLbLAhXCj44KHWiZAYAQFggbMAA&url=http%3A%2F%2Foptiwave.com%2Fresources%2Fapplications-resources%2Foptical-system-negative-dispersion-fiber-for-metro-networks%2F&usg=AFQjCNEuCE7mOQ9IU8uvnJpQ_nPrt9ezcw&sig2=hkSziDDA71s8H8OzGKkIxQ&bvm=bv.116573086,d.c2E

regards

hi umar syed,
more losses are associated with transmission because the length has increased hand to compensate those losses , the requirement of the parameter (say power) increases linearly and then suddenly the requirement drops..

i now think that nagative penalty(db) means that we should decrease power so as to reduce the effect of eye closure
i my self thinks now that penalty for eye opening can be both positive and nagative

case1:positive penalty: in this situation we require to compenate the losses of any parameter in design such as length.

case2:nagative penalty: there may be case where excess of power may create nonlinearities and other thermal noise at reciver end,

hence we should reduce the power, threfoe the penality is nagative.>>>>>>>>>>>>.

hope this will hrelp abit. and for futher details go for my same post

panalty:eye openining(in DB)

with reagards

yeah umar,
you are welcome

but it is my thinking and is surely right,
but may be there could any other reason which we are skipping
with regards

hi all….
As rightly answered by aasif dar…that nagative penalty(db) means that we should decrease power so as to reduce the effect of eye closure
i my self thinks now that penalty for eye opening can be both positive and nagative—–gives negative or positive penalty…

I would like to add a link here for more detailed information
https://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwjQgOTZ6LbLAhUDQI4KHRmpA-sQFggbMAA&url=http%3A%2F%2Foptiwave.com%2Fwp-content%2Fuploads%2F2015%2F06%2FAND9075-D.pdf%3Fb82c69&usg=AFQjCNGKHCJi9da1JjS1Ax_KGC9vrTbenw&sig2=34GNVemwRjYBnLqIaw_Y6Q&bvm=bv.116573086,d.c2E
with regards

Hi all,
As pwer penalty is occure when a parameter in the system changes and results in degradation of the eye-opening, the amount of power that compensates for that degradation.
http://ieeexplore.ieee.org/Xplore/defdeny.jsp?url=http%3A%2F%2Fieeexplore.ieee.org%2Fstamp%2Fstamp.jsp%3Ftp%3D%26arnumber%3D1601338%26userType%3Dinst&denyReason=-133&arnumber=1601338&productsMatched=null&userType=inst

thanku asif bashir for your views…
best regards

you are welcome all

Hi,
As Eye Opening Penalty (EOP) is defined as twice the average signal level
divided by the smallest value of a one sample minus the largest value of a
zero sample. The EOP is not a power penalty. So it has nothing to do with
the fiber light loss budget. It shows the posibility of choosing a decision
threshold and should be less than 1 dB. So, if twice the average signal level
divided by the smallest value of a one sample is less than the largest value of a
zero sample, then eye-opening penality will be negative .
Eye Opening is related to pulse smearing. Pulse smearing is due to
optical dispersion of the fiber (among other things).

hi umer syed..
It is already discussed by Alistu in one of the previous post that Eye opening is a characteristic that is used to evaluate system performance. Wider eye opening makes the system performance better by making decision making easier. And increase in power is a way to make system performance better and its effect can be seen in the eye diagram.
The increase in the power may cause system performance to degrade due to fiber non-linearities which come into play at higher powers.so the increase in power has a negative effect on the eye opening resulting in degradation of the eye opening which is known as power penalty as increase in power resulted in penalty or degradation of the eye opening.
So i think you got negative eye penalty because of this thing.
Hope it helps
with regards

You can also refer to the references attached by Tanveer and ranjeet kumar to get your queries answered as it is discussed in these thoroughly.Aasif sir has also explained it very nicely.hope you will get some help.
with regards

hi umer syed
good to hear your problem is solved cheers