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What is the bandwidth of the detectors?

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(joined October 2014)
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for lower frequencies am getting smooth curves, but for the higher frequencies i am getting diagonally clipped sine waves..why?

Responses (23):

    • #15663
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      K. Esakki Muthu
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      for lower frequencies am getting smooth curves, but for the higher frequencies i am getting diagonally clipped sine waves..why?

    • #15690
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      Alessandro Festa
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      Which detector are you referring to?

    • #15695
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      K. Esakki Muthu
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      i used both PIN & APD…but sometimes i am getting Amplitude Modulated Waveforms too

    • #15696
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      K. Esakki Muthu
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      i hav attched the signal after the detector

      Attachments:
    • #15698
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      K. Esakki Muthu
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      detected signal at 15 Ghz

      Attachments:
    • #15709
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      Ravil
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      What is your detector cut-off frequency? Not able to view your attachment…

    • #15717
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      Alessandro Festa
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      Under the tab “frequency” you can set the bandwidth of the PIN/APD…

    • #15732
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      K. Esakki Muthu
      Participant

      Dear Ravil, i don’t know what kind of image format to upload in this forum?

    • #15733
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      K. Esakki Muthu
      Participant

      Dear Alessandro Festa, thank u …let me try

    • #15736
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      Ravil
      Participant

      esakkimuthu, jpg and png should work. I think you should be able to see it when you go “upload”.

      +1
    • #15737
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      Ravil
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      According to your question, the main reason is the cut-off frequency which you should be able to change with “frequency” tab (as recommended above).

    • #15814
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      vipul
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      Hi
      Simply screen print it and paste it in paint,change type file as .png and save.

    • #15848
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      Ravil
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      By the way, what version of OptiSystem are you using?

    • #15879
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      Heitor Galvao
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      Look, I understand what you meant I converted their two images to the jpeg format, and in it I saw what you meant “i used both ODA & PIN … but sometimes i am getting Amplitude Modulated Waveforms too”. At 165-GHz and 15GHz, I would say to you see the global parameters as it was not offered more details of your project or you’re working I created a transceiver (+ external modulation laser + receiver) connected the photodio PIN and APD, and then bessel filter and low was stirring in the cutoff frequency, the here what will change is the value that is being in its cutting frequency, in versions greater than there are optisystem 7 ‘s a variable in the global paramatros called symbol rate, this variable was created specifically for to set the cutoff frequency of electrical filters, there you will vary the value of it, to arrive at a value in a waveform is acceptable in your oscilocospio. If you are using optisystem 7, created a new variable in global parameters then goes in the properties of the photodiodo and in the script of “custom frequency” place 0.75 * (name of the variable that you created) I hope this helps
      my compliments

      +3
    • #15884
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      Ravil
      Participant

      Good idea Heitor, but I’m still wondering what scheme exactly did he use then…

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