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Advanced modulation with WDM fso

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(joined August 2022)
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hi
when i designed a qpsk system with wdm fso and increased the number of channels from 8 to 16 and keep the center frequency 193.44khz at fixed distance , attenuation , and all other parameters so when i compare the result of Log BER for 193.414 at 8 channels wdm and for 16 channel WDM i found that the value get better at 16 channel for example the value at 8 channel is -3.152 and for 16 channel is -3.192 . i think that is not true? can any one help me to clarify this point .

thanks

Responses (3):

    • #71484
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      Jaafar ali
      Participant

      hi
      when i designed a qpsk system with wdm fso and increased the number of channels from 8 to 16 and keep the center frequency 193.44khz at fixed distance , attenuation , and all other parameters so when i compare the result of Log BER for 193.414 at 8 channels wdm and for 16 channel WDM i found that the value get better at 16 channel for example the value at 8 channel is -3.152 and for 16 channel is -3.192 . i think that is not true? can any one help me to clarify this point .

      thanks

    • #71541
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      Ahmad Atieh
      Moderator

      Dear Jaafar,
      both results are considered the same. you will get different result if you repeat the calculation. This is due to randomness in the simulation.
      Regards,
      Ahmad

    • #71544
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      Jaafar ali
      Participant

      Dear Doctor,
      Is that mean when Increasing the number of channels in the system, there is no effect on the value of log ber for a channel that i take it result ?

    • #71551
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      Ahmad Atieh
      Moderator

      No, I didn’t say that. I said for your specific numbers there is no difference.
      You need to check the systems’ performance by dividing them harder by increasing the range, attenuation, decreasing OSRN, etc. There should be differences between the two systems.
      regards,
      Ahmad

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