Home Forums SYSTEM AMPLITUDE MODULATOR NOT GIVING A CORRESPONDING AMPLITUDE MODULATED SIGNAL

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    • #22003
      Taiwo Ambali Abiola
      Participant

      I observed that using both Amplitude modulator and frequency modulator modules to modulate signals do not give corresponding amplitude modulated and frequency modulated signal out respectively. The same with Phase modulator when checked the output signal with Time Domain Visualizer. With Amplitude modulator, I am actually expecting and amplitude modulated signal in form of envelop. What is the hidden secrete behind this?

      Thanks

    • #22037
      Damian Marek
      Participant

      Could you please elaborate a little more? What type of output are you expecting and how it is different than the OptiSystem simulation?
      Attaching your project file would also help.

    • #22038
      Taiwo Ambali Abiola
      Participant

      Thanks Damian,
      I am actually expecting and envelop modulated signal based on the theory of amplitude modulation as attached in the .JPG file attached. The attached Pdf is what I saw when the signal is amplitude modulated. I noticed frequency modulator and phase modulator modules are also not giving me the expected response base on theory.

      Kindly help on what I am suppose to do.

      Thanks.

    • #22044
      Alessandro Festa
      Participant

      Hi Taiwo,

      unfortunately, no attachment can be seen to your post. Can you post again and attach the images you are mentioning above?

    • #22048
      Taiwo Ambali Abiola
      Participant

      Oh! sorry, Kindly find the two attached files. The last waveform (envelope) on the image file is what I was expecting but I got the attached pdf.

      Kindly help.

      Thanks

    • #22049
      Taiwo Ambali Abiola
      Participant

      Seems I can not attach the files or two different formats. I did on two different system.

    • #22051
      Taiwo Ambali Abiola
      Participant

      ok, here is what I got

      Attachments:
      • #22069
        Ravil
        Participant

        Hi Taiwo, according to the picture, which you have uploaded, you have your modulating signal. However, you are expecting to capture the envelope? I am not sure if OptiSystem allows you to do it this way. But, for the case of real oscilloscope I would agree with Alessandro…

        +1
        • #22073
          Alessandro Festa
          Participant

          Yes, I do not see any option that allows you to detect the optical frequency instead of just the modulating signal at lower frequency…I don’t think you can do that with this visualizer on OptiSystem.

          +1
    • #22053
      Alessandro Festa
      Participant

      I do not understand where the problem is…the visulaizer is showing what you would see on an oscilloscope, where you cannot measure the “optical frequency” oscillation at about 190THz!

      +1
      • #22100
        Ravil
        Participant

        Yes, Alessandro. I completely understand your point and agree with your statement!

    • #22074
      Taiwo Ambali Abiola
      Participant

      Oh! I see, thanks alot for the information both Festa and Ravil. I thought I would be able to see the envelope signals

      • #22101
        Ravil
        Participant

        You are welcome, Taiwo! As a forum member, I am always glad to give you my advice when I can. Good luck with your work and research!

      • #22124
        Damian Marek
        Participant

        Just coming back to give an official response, OptiSystem treats optical signals as complex envelopes for simulation purposes. It would slow down simulation time considerably if the software had to sample at optical frequencies >190 THz.

        Regards

    • #22078
      Alessandro Festa
      Participant

      You are welcome Taiwo!

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