Forum Replies Created

    March 1, 2017 at 5:42 am #42619
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    Priti Garg
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    I am trying to simulate a 64 QAM OFDM coherent detection system
    As far as i know the symbol rate should be 1/6 of bit rate but my simulation not accepting these values rather it is working fine for 1/5 of bit rate and giving huge EVM

    Regards

    March 1, 2017 at 3:51 am #42614
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    Priti Garg
    Participant

    hi
    There is a QAM file given in samples/ Advanced modulation formats/QAM

    In the same file u can remove DSP block

    but performance will come down.
    hope it helps

    March 1, 2017 at 3:44 am #42613
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    Priti Garg
    Participant

    hi
    cant see ant attachment pls try to take a screenshot and upload.

    February 28, 2017 at 4:34 am #42599
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    Priti Garg
    Participant

    u can refer to this link
    https://optiwave.com/category/optisystem-manuals/optisystem-tutorials/
    also go through the example files in the optisystem.

    hope it is useful

    February 28, 2017 at 4:30 am #42598
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    Priti Garg
    Participant

    Please attach your file or the screenshot of your setup, so that others can help.

    February 28, 2017 at 4:28 am #42597
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    Priti Garg
    Participant

    please help

    February 25, 2017 at 1:08 pm #42563
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    Priti Garg
    Participant

    hi

    constellation diagram can be viewed in electrical domain only in optisysem

    February 24, 2017 at 10:56 pm #42559
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    Priti Garg
    Participant

    hi

    Another thing i want to know is what other alternative we have for RSOA?
    Can it be replaced by VCSEL?

    February 24, 2017 at 10:27 am #42558
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    Priti Garg
    Participant

    Hi Prashant
    I cannot see any file
    please attach a screen shot
    Regards

    February 24, 2017 at 10:16 am #42557
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    Priti Garg
    Participant

    Hi Abhilash

    thanks or your reply.
    As far as i read from previous posts we can not use BER analyser to measure BER for an OFDM system and we should use BER test set instead.

    Is there any other way to measure BER in an OFDM system ?

    Regards

    February 23, 2017 at 11:47 pm #42551
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    Priti Garg
    Participant

    hi Damian

    I read in one of the posts that there is a bug in BER test set, i am using it to find BER for an ofdm based system can u please clarify.

    February 23, 2017 at 3:04 pm #42549
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    Priti Garg
    Participant

    I am attaching screen shot as I could not attach file

    February 23, 2017 at 2:47 pm #42547
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    Priti Garg
    Participant

    Hi Abilash

    i am attaching one sample file on OFDM if irun this i getBER =0.06 on BER test set, is it acceptable?

    Regards

    February 23, 2017 at 2:39 pm #42546
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    Priti Garg
    Participant

    Hi Dhiman
    1. please guide me on the range for power so that it can be detected at the receiver.
    as pointed by you I get very low power at receiver, it is -58 dBm at input to coherent receiver.

    2. Also in a bidirectional fiber link should i try to boost power using amplifier or will it further degrade BER?

    3. Which kind of amplifier should i use?

    Regards

    February 17, 2017 at 2:49 am #42463
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    Priti Garg
    Participant

    Thanks for sharing useful information
    can you suggest what BER i should expect for an OFDM based QAM 16 link of 20 km length
    Thanks