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Optical Gian vs Electrical Gain

  1. Jun 12, 2013 #1
    I was wondering what the trade-offs were in having an optical gain (say with EDFA) compared to electrical gain (say with a PIN and transimpedance amplifier) of an optical signal.
  2. jcsd
  3. Jun 13, 2013 #2
    Is it possible to turn a very coherent signal into one much less


    I am curious to know if there any passive (or simple active) methods to convert a very coherent signal into an incoherent one? I suppose I would need to find a way to chirp the signal and a non-linear medium might be one method. Any ideas?


  4. Jun 14, 2013 #3

    Claude Bile

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    For coherent optical signals, a component called a diffuser is normally used to reduce the coherence.

    Regarding your first post, optical gain has a much higher bandwidth than electrical gain.

  5. Jun 17, 2013 #4
    Hi Sorry, I somehow posted a question within another post. Thanks for your reply on both though. I have a few more things to ask based on your answers if you don't mind.

    Post 1: When you say optical gain is much higher bandwidth, do you mean in terms of gain available across and optical bandwidth or temporally?

    Post 2: Is a diffuser more to break the spatial coherence? If so, how does this impart temporal coherence?


    perhaps to stimulate higher order modes; forming "Speckle"?


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