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haphazard waveform

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    • March 24, 2016 at 11:11 am #33730
      jyoti raina
      Spectator

      helo evryone..
      i am facing a prblm.. i dont know why my mux’ed signal is like this..it is very haphazard and not so clear…i m designing a four channel wdm system.. i hv taken a sample frm the example folder and it was for 16 channel wdm system..thr i checked the waveform was clear havng 16 distinct signals..bt nw whn i changd it to 4 channel wdm..the ber got betr bt now this happens.
      check the picture plz and help plz..
      thanx in advance

    • March 24, 2016 at 3:34 pm #33754
      Damian Marek
      Participant

      Your filter settings in the Mux and Demu are probably not set correctly for the new channel positions.

      Make sure they match

    • March 25, 2016 at 2:41 am #33789
      jyoti raina
      Spectator

      hi Damian sir.. thanx fr replying to my query.
      what is the thing i hv to do to set them right.. do i hv to change filter setting of wdm mux demux only or the all filters frm the receiver side..i m also using low pass bessel filtr with order 4..
      i ll try to check and see this..anywyz thanx agn fr the kind help.

      • March 25, 2016 at 2:59 am #33795
        Dr. Dhiman Kakati
        Participant

        Hello Jyoti Raina,
        Damian has suggested what you can look into, and without looking at your design and component parameters its difficult to give a fruitful solution. If it is possible please upload your design file. Thanking you..

        Regards,
        Dhiman

        • March 25, 2016 at 3:08 am #33798
          jyoti raina
          Spectator

          hi dhiman sir..thanx for replying.
          I hv taken an example from the optiwave samples for wdm systems.. it had 16 channels.. i changed it to 4 channels so that i could start frm basic..
          when changing to 4 channel i got this waveform which is different from the one i got when i simulated the sample example..
          now i ll try changing the filter as suggested by damian sir.. i hope it works well.. anyway thanx a lot

        • March 25, 2016 at 3:24 am #33805
          Dr. Dhiman Kakati
          Participant

          You are most welcome and Thank you Jyoti for making me clear, I will lok into the same example and try to modify as you are doing and let you know if i succeed.

          Regards,
          Dhiman

        • March 25, 2016 at 2:16 pm #33864
          Dr. Dhiman Kakati
          Participant

          Hello Jyoti Raina,
          I have modified the 16 channel NRZ ideal WDM design from the library to have 4 channel at the input and find acceptable BER and Q-factor. Please have a look into this design attached herewith and respective wavelength wavelength snapshot.

          The modification I have done here are following,

          the transmitter output changed from 16 to 4.

          deleted unnecessary blocks.

          fiber centre wavelength to 1563 nm.

          Dispersion compensation fiber reference wavelength to 1563 nm.

          WDM demux output wavelength to the 1st two transmitted wavelength i.e. 1565 nm and 1563 nm.

          Thats all.

          Thanking you..

          Regards,
          Dhiman

        • April 2, 2016 at 3:26 pm #34657
          jyoti raina
          Spectator

          Thanx Dhiman sir..

    • March 25, 2016 at 3:10 am #33800
      SAHIL SINGH
      Participant

      Hello Jyoti Raina,

      I agree with Dhiman kakati that without looking at your design and component parameters its difficult to give exact or workable solution. Try uploading your .osd file so that forum members can provide you with the optimum possible solution… Thanking you..

      Regards

      Sahil Singh

      • March 25, 2016 at 11:16 am #33835
        jyoti raina
        Spectator

        hi sahil singh.. thanx for ur reply i am grateful to you.
        I already mentioned that i have modified the sample example from 16 channel to 4 channel system rest i have kept the same…
        i tried increasing the length..stil i vil try to upload the sample file fr ur convenience so dat u cud see what is wrong with it..
        plz see i am uploading it with this comment of myn. thanx in advance

    • March 25, 2016 at 3:28 am #33806
      burhan num mina llah
      Participant

      hello jyoti raina

      Try uploading your .osd file in order to get a better of your problem and also try to upload a screenshot of the wdm mux setting and that of wdm demux. so that the help for you would be presize enough .

      Regards

      Burhan

      • March 25, 2016 at 11:21 am #33837
        jyoti raina
        Spectator

        hi burhan mam…thanx for ur kind reply n time.
        i hv already uploaded the sample simulation file..just change the no of channels from 16 to 4..rest i hv kept same almost..
        i wil be grateful if u see why this type of behaviour aftr the mux. i vil be looking forward to ur reply.
        thanx in advance

    • March 25, 2016 at 12:00 pm #33841
      SAHIL SINGH
      Participant

      Hi Jyoti Raina,

      What i think is that Atul Sharmas comments are showing awaiting moderation becausw he might be new to the optiwave forum and has not been yet approved by the optiwave team to comment on the forum… They will first check whether his comment is appropriate so as to allow him on the forum.. After approval you and all other forum members will be able to see his comments for sure… So you must wait sometime… Hope this helps

      Regards

      Sahil Singh

    • March 31, 2016 at 10:45 am #34243
      jyoti raina
      Spectator

      Thanx everyone for ur help..my signal waveforms got finer when i changed many things… Thanx dhiman sir for ur kind efforts…
      this is my new waveform..i think it is correct noww…i guess..
      thanx once agn

      • April 1, 2016 at 5:01 am #34291
        Dr. Dhiman Kakati
        Participant

        You are most welcome Jyoti Raina, The spectrum image you have attached here is quite Good as there is no overlapping now. I think you should get better result now but one thing i need to mention that how much frequency separation you are giving to get this Spectrum at the WDM mux output because if you give more than a limit you will not be able to transmit longer distance. Thanks for uploading.

        Regards,
        Dhiman

        • April 1, 2016 at 1:22 pm #34317
          jyoti raina
          Spectator

          Thanx Dhiman sir for ur kind reply..i think u are asking about the frequency spacing??
          i am giving 100 Ghz spacing between the four transmitted frequencies…i am also using wdm mux with 15 Ghz bandwidth..bcoz somewhere on the forum i read it gives u better results so i increazed it to 15 which i think is nt dat much…i hope i am not doing wrong…dhiman sir i hv one query abt plotting graphs for all 4 receivers on the same graph for ber abd q factr…bt m nt able to do it at a time fr all..cn u plz tel me if i can do it..i vil b very much thankful…thanx in advnce

        • April 1, 2016 at 10:42 pm #34427
          Dr. Dhiman Kakati
          Participant

          Hi Jyoti,
          Thank you so much for providing with the values. regarding your query,you need to find all the respective values and make a table in Microsoft excel and from there you can plot all of them as per your wish, There are many videos in youtube where it is nicely explained. Just do a search “how to plot a graph in excel” and thats done. remember you need to pres and hold control button for doing in case of multiple graph.

          Regards,
          Dhiman

        • April 2, 2016 at 3:27 pm #34658
          jyoti raina
          Spectator

          Thanx fr d help Dhiman sir..it was very helpful indeed..

    • March 31, 2016 at 10:59 am #34250
      aasif bashir dar
      Participant

      hi joyti raina,
      i thick you must know what is awaiting moderation because you also have gone the same stage while joining and posting in optiwave forum for the first time as the recruit,,
      any ways awaiting moderation means the checking the first post of newly joining member in optiwave forum by the optiwave admin.. it takes the 24 hourss… after that the post gets shown on the forum.
      with regards

      • April 2, 2016 at 3:29 pm #34659
        jyoti raina
        Spectator

        sry aasif sir i din know..thanx fr tht info

    • March 31, 2016 at 11:03 am #34251
      aasif bashir dar
      Participant

      hi joyti raina,
      your query related to awaiting moderation answered in reply no #34250
      with regards

    • March 31, 2016 at 11:12 am #34256
      SAHIL SINGH
      Participant

      Hi Jyoti Raina,

      As far as awaiting moderation is concerned that is allready mentioned in the previous comments…

      Regards

      Sahil Singh

    • April 2, 2016 at 3:38 pm #34668
      SAHIL SINGH
      Participant

      Hi Jyoti Raina,

      You are welcome.. This forum is meant to help each other and share our valuable information and experience.. Thanks Optiwave forum..

      Regards
      Sahil Singh

    • March 25, 2016 at 11:24 am #33838
      jyoti raina
      Spectator

      hi atul sharma..thanx fr reply bt what is awaiting moderation?
      n sorry by mistake i hit the like button..no option of unlike..by mistake.
      thanx anyway

    • April 1, 2016 at 5:06 am #34292
      Dr. Dhiman Kakati
      Participant

      Hi Jyoti,
      please refer to the answer at reply no 34250, provided by Aashif Bashir Dar. and the like button is for supporting the answer or the answer that solved your problem.

      Regards,
      Dhiman

    • April 2, 2016 at 3:30 pm #34660
      jyoti raina
      Spectator

      thank u ol for the help…i am really thankful to ol people n the forum..

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