Forum Replies Created

    #66979
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    shaymaa Tahhan
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    Should I put a value in the OFDM POWER in the OFDM modulator?

    #66967
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    shaymaa Tahhan
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    Yes SER is zero also whenever BER is zero.
    1- what is the best bitrate to configure and evaluate the OFDM QAM4 system based on?
    because when I increase the bitrate the BER is increasing with SMF distance (take the symbol rate half of the bitrate because I am using QAM 4)
    2- if I took the one span (10km SMF, 2km DCF) should I include the length of the DCF in the OFDM demodulator or just the SMF?
    if NO, then if I increase the span to 20 the DCF will be 40km is it ok to not include its length?!

    #66952
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    shaymaa Tahhan
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    whenever I got OFDM EVM less than 5% , the BER readings in the tester is 0
    is that realistic or what should I do?
    I have tried many times but the same!

    #66938
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    shaymaa Tahhan
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    need the answer to this question please.

    #66595
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    shaymaa Tahhan
    Participant

    please send me your email address to send you the file.

    #66313
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    shaymaa Tahhan
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    this is the signal after the RSOA

    #49918
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    shaymaa Tahhan
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    attached is my try in optisystem please correct it for me.

    #49910
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    shaymaa Tahhan
    Participant

    dear sir,
    the attached block diagram , the highlighted part of SOA and Modulator.
    please advice me how to connect the and please send me an optisystem picture simulate these parts
    kind regrads,
    Shaymaa

    #49748
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    shaymaa Tahhan
    Participant

    Hello Binh,

    did you mean by the BEN the same as digital delay generator shown in the following link
    https://www.thinksrs.com/downloads/pdfs/manuals/DG645m.pdf
    If yes did you solve your problem ??

    kind regards,
    Shaymaa

    #49745
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    shaymaa Tahhan
    Participant

    Dear Prof. Mohammed,
    this link is the specification sheet for the digital delay generator which i am trying to simulate it
    and thhttps://www.thinksrs.com/downloads/pdfs/manuals/DG645m.pdf
    hopeful you can help me
    Kind regards,
    Shaymaa

    #49500
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    shaymaa Tahhan
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    Thank you for your prompt response. Could you please send me the example any way? I have ver 14 also.
    It is very important for me.
    Kind Regards
    Shaymaa

    #41133
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    shaymaa Tahhan
    Participant

    Dear Sam,
    Thank you for your reply. Attached the noise bandwidth of the EDFA that i meant before. thank you for clarification about logarithmic scale.

    For now I am only have these two problems
    1> what is the noise bandwidth that i should put in the EDFA to get the maximum Qfactor ?
    2> what is the required bandwidth of demultiplexer and multiplexer to get the maximum Q factor?

    again please find the attached pdf in which all the description of the simulation that I am working on.

    Then i want to replace the DCF by FBG to find whether it can be more efficient with duobinary or not?

    so how to calculate the length of the FBG ? how to get the Dispersion ?
    for Ideal FBG i now that for a length of SMF which has (16 ps/nm km ) the dispesion will be the multiplexing of these values but in minus sign like for 100Km the FBG dispersion will be -1600ps/nm

    but for FBG how?