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nagative eye opening penality

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(joined April 2015)
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i got the nagative value of the panalty for eye opening,please explain it to me the significance of nagative value and a bit about the interpretation of the graph.

responses will be appreciated
with regards

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Responses (17):

    • #32170
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      umer syed
      Participant

      i got the nagative value of the panalty for eye opening,please explain it to me the significance of nagative value and a bit about the interpretation of the graph.

      responses will be appreciated
      with regards

      Attachments:
    • #32172
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      umer syed
      Participant

      hi all,
      i think asif was had mentioned the same in the another post, relating to the eye penalty in db for the eye opening and its significance.

      panalty:eye openining(in DB)


      asif i got your query now;

      solution to one of the post will solution to another also

      with regards

    • #32231
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      Tanveer
      Participant
    • #32271
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      aasif bashir dar
      Participant

      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

      +1
    • #32285
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      umer syed
      Participant

      yeah aasif bashir dar,

      i think it may be like that.
      due to the xcess power density , there are nonlinear effects wjich degrades the system performance,
      hence further increase in the poer will further degrade the system….

      thus in such case we have to reduce power from that of previous value…. hence value is nagative.

      thanks for you explaination

      cheers

      with regards

    • #32301
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      aasif bashir dar
      Participant

      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

    • #32328
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      Tanveer
      Participant

      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

    • #33571
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      umer syed
      Participant

      hi tanveer,

      it was just his perception or thought ,,, that he think may be the explaination…. he may be right or wrong.

      but for me itz is valid explaination..
      if any one has any other explaination he is welcome here to share it..

      with regards

    • #33775
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      Ranjeet Kumar
      Participant

      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

    • #33987
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      Tanveer
      Participant

      thanku asif bashir for your views…
      best regards

      +4
    • #34004
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      aasif bashir dar
      Participant

      you are welcome all

    • #34056
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      Ranjeet Kumar
      Participant

      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).

    • #34368
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      umer syed
      Participant

      i ranjeet kumar….
      can you explain it in detail with proper reference of the information you are talking….
      with regards

      +1
    • #34379
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      ZULKARNAIN
      Participant

      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

      • #34937
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        Atul Sharma
        Participant

        Hi Zulkarnain.

        A new term i heard about.

        +13
    • #34382
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      ZULKARNAIN
      Participant

      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

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