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Filter, WDM

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(joined January 2020)
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https://pdfs.semanticscholar.org/9c4e/241ed6f7a29896c49bca4402555b41847f0b.pdf

In this journal at Fig. 3 and at Fig. 4 Low Pass Bessel filter is used. I have seen similar simulation diagrams, where, after a photodetector a low pass filter is used to filter out the electrical signal.

But why is it necessary to use a low pass filter?
Why not other types of filters?
Can anyone explain?

Thanks in advance.

Responses (1):

    • #65354
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      ZH
      Participant

      https://pdfs.semanticscholar.org/9c4e/241ed6f7a29896c49bca4402555b41847f0b.pdf

      In this journal at Fig. 3 and at Fig. 4 Low Pass Bessel filter is used. I have seen similar simulation diagrams, where, after a photodetector a low pass filter is used to filter out the electrical signal.

      But why is it necessary to use a low pass filter?
      Why not other types of filters?
      Can anyone explain?

      Thanks in advance.

    • #65439
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      Ahmad Atieh
      Moderator

      Dear ZH,
      The filter after used after the pin detector is a lowpass filter because the pin detector is a square low device which makes the spectrum of the desired signal at baseband.
      Regards,
      Ahmad

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