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DDO-OFDM with OS12 OFDM components

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(joined September 2014)
Participant

Hi all,

I am trying to get the Optisystem direct detection optical OFDM (DDO-OFDM) sample osd file to work with Optisystem 12 OFDM components. So I have replaced the Optisystem 13 OFDM components with those of Optisystem 12, and I have also made some changes that I thought were necessary to the BER Test Set. But I can’t seem to be getting an acceptable answer from this implementation, even when I do the simulation for a back-to-back system and lower the bit rate. Please provide the necessary changes to the file so that it would give the results. hank you in advance.

Regards

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Responses (33):

    • #24585
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      alistu
      Participant

      Hi all,

      I am trying to get the Optisystem direct detection optical OFDM (DDO-OFDM) sample osd file to work with Optisystem 12 OFDM components. So I have replaced the Optisystem 13 OFDM components with those of Optisystem 12, and I have also made some changes that I thought were necessary to the BER Test Set. But I can’t seem to be getting an acceptable answer from this implementation, even when I do the simulation for a back-to-back system and lower the bit rate. Please provide the necessary changes to the file so that it would give the results. hank you in advance.

      Regards

      Attachments:
    • #24644
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      Ashu verma
      Participant

      H! Alistu
      I am not able to open the file attached.Every time i try to open file attached by you,i have same problem.All the files which simulated in latest version that easily open in my trial version.I can’t understand why it is so.I have tried with the way you mentioned in one of the forum topic but end up with no results.

      • #24650
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        alistu
        Participant

        Hi Sam,

        The problem that is mentioned a couple of times in other forums occur when my file is saved in doc format. But here I have attached it in osd format and have been solved. I think it would be better to see if others encounter the same problem by using Optisystem version 13.0.3. If they can’t open it either, the problem is from my software. Otherwise, it’s from yours.

    • #24652
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      Ashu verma
      Participant

      Ok,I got the problem,I think since you have the 13.0.3 , so these updated files could not be open by trial version.It seems to me like this.I have attached a screen shot for what error system gave to me

      Attachments:
      • #24654
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        alistu
        Participant

        If you are also using Optisystem version 13.0.3 like I do, then I don’t think the problem is from your software. As far as I am concerned, the 30-day trials of Optisystem function like a full version and I think this is mentioned at the start of the installation of the program if I remember correctly.

    • #24656
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      Ashu verma
      Participant

      Once i got same problem when damian attached file in Twdm pon.But damian then said that trial version is capable to open these files.But i couldnt at that time too.We will see the problem in my system or other member face it also or not.Thank you Alistu

      • #24689
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        alistu
        Participant

        If Damian has confirmed such a thing, then the problem is not most probably from my file. However, if somebody else faces the same problem, I will attach a new osd file, but it should work fine according to my experience.

    • #24752
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      Damian Marek
      Participant

      Hi all,

      I successfully opened your project Alistu and I am using 13.0.3. I believe the problem may be that Sam has a slightly older version. Same what does the About window say about your version number?

      • #24754
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        alistu
        Participant

        Thank you Damian for checking the file and verification. Can you please help me with the implemented system if it is possible? I haven’t made any changes to the DDO-OFDM sample file except using OS 12 OFDM and unticking “using OFDM” option in BER test set, so it’s supposed to be working. Thank you again.

    • #24753
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      Ashu verma
      Participant

      Damian you may correct ,i think i have downloaded the version i am using ,a some time ago ,almost 5-6 months but run now.May be this would be the case.

    • #24803
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      alistu
      Participant

      Here I have attached another file from the same system, only with additional spectrum analyzers. Another thing I find strange is that the RF analyzers only show the range of 0 to 20 GHz. Even when I assign a frequency out of this range to quadrature modulator, the RF spectrum analyzer_2 (the one right after quadrature modulator) shows the signal with center frequency within the aforementioned range.

      Attachments:
    • #24837
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      Dhananjay Patel
      Participant

      I have observed one issue with the downloading and opening of .osd files. Ifweare trying to download and open the file in mozilla then, it does not gets open. However when I tried using it with google chrome, the file is downloaded and open for working.

    • #24838
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      Dhananjay Patel
      Participant

      Dear Alitsu,

      I have checked ur design and am not able to find the error in the same. However I am attacheing two of my design using )S12 components. I hope this helps.

      First is the simple OFDM modulation and demodulation. the second one is the with optical uconversion. I am able to get the spectrum at the photodetector correctly. I hope you can make changes as per your requirement.

    • #24840
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      Dhananjay Patel
      Participant

      here is the another file

    • #24905
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      alistu
      Participant

      I appreciate your help, Dhananjay. As I mentioned, I have used the Optisystem sample file and for the default bit rate, the system is working. It seems that what I refer to as “the problems” are there in your implementations, too. Besides, when I change the bit rate to one GHz in your file, the simulation stops working with an error and the software closes. This is not my concern, though. Thanks again for your help.

    • #24975
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      Dhananjay Patel
      Participant

      Dear Alitsu,

      Can you tell us, what design are you planning to implement. What will you do once the OFDM system is implemented. May be I can help better.

      • #25000
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        alistu
        Participant

        Dear Dhananjay,

        Currently I am trying to get the acceptable results from the implementation I have attached, which is the Optisystem sample osd file for direct detection O-OFDM without version 13 OFDM components. I simply want to be able to change the bit rate and get appropriate results (not necessarily good results); Results that assure system is working fine.

    • #24978
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      Dhananjay Patel
      Participant

      Dear All,

      I would like to ask an open question to all. When we try to implement a system on optiwave and if we get the outputs well. How do we decide that the output which we have got is correct.

      We need to have a mathematical modelling for the same. This can be done in matlab. for mathematical modelling, we need to have equations for the entire system. Can optiwave provides us with the equations which they have used to implement the following blocks. (For eg. If I am trying to build OFDM system with optical transmission, then I need to have the equations for all the blocks used to design the same. Then I can write those equation in matlab and get the mathematical modelling for the same.)

      Please correct me if I am wrong or provide some more information towards working of this step.

      • #25002
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        alistu
        Participant

        If my perception is correct, you want to have a way to check the results. The components available in Optisystem are supposed to be based on mathematical models of the real components and the information about which papers or references have been used for modeling are available at the help section of the components. I think if you want to see if a system is working fine, you can simply compare the results to those of a paper. In case one is not working based on a paper, they should use their general understanding of the system to determine whether the results are acceptable or far off the limits. Implementing all components models in Matlab is really hard and time consuming.

        Regards

    • #25005
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      Abhishek Shrama
      Participant

      Hi Dhanajay
      Your suggestion is good and this may be preferred to test the system performance.I have seen mathematical and simulation results comparison in many papers from some journals with good index.But as far as mathematical testing is concerns, don’t you think it is difficult to test every time about simulation.Optisystem made it user friendly software by using matlab and i have used some other softwares too for same purpose,but optisystem is very easy to use.
      For you second question ,if you want the mathematical calculation of all the components then go to component > double click then at bottom of page there is reference from which that component realized. In case there is no reference than you may ask optiwave for the equations.Most of the equation described in help tutorial also.
      But i like the idea which you suggested.
      Thank you
      P.s Fortunately we have given somewhat same answer Alistu ,simultaneously ๐Ÿ™‚

      +1
    • #25073
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      Dhananjay Patel
      Participant

      I agree with you guys. But during presentations if you show simulayions results using a software people ask for its mathematical or hardware validations. Hardware validation is not possible due to lack of infrastructure and mathematical is difficult to achieve

      Let us together, try to find a way out

      • #25088
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        alistu
        Participant

        You are right Dhananjay. However, the only practical way I can think of is to rely on our own knowledge of the system, based on which we expect certain results. If the results are very different from our expectations, then we might ask Optiwave team if the component is working right.

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