optical modulator (optical modulations )?

Discussion in 'General Electronics Chat' started by abhimanyu143, Feb 12, 2015.

  1. abhimanyu143

    Thread Starter Member

    Aug 25, 2014
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    hello ,
    modulation is process by which some Characteristic of carrier wave (amplitude , frequency phase) varied according to modulating signal. this process called modulations

    carrier signal - EM wave
    modulating signal - image , music, speech signal

    what is optical modulator ? what is optical modulations ?
     
  2. pwdixon

    Member

    Oct 11, 2012
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    ask google.......
     
  3. abhimanyu143

    Thread Starter Member

    Aug 25, 2014
    211
    1
    ok according to my search ''modulation is process by which some Characteristic of optical carrier wave (amplitude , frequency phase) varied according to modulating signal. this process called optical modulations. I am not sure
     
  4. shortbus

    AAC Fanatic!

    Sep 30, 2009
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    Some Fender guitar amplifiers used this for a "reverb" in them. Basically a neon light bulb and a photo transistor bound together to make the modulation. There was a recent tread over at ETO forum about them.
     
  5. Magician

    New Member

    Aug 18, 2014
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    Optical modulation has one more, polarization. You can modulate polarization of the laser beam, and measure a sugar level.
     
  6. crutschow

    Expert

    Mar 14, 2008
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    By optical modulation, do you mean modulating a light beam?
    What are you trying to do?
     
  7. GopherT

    AAC Fanatic!

    Nov 23, 2012
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    The same concepts with electricity can be used to modulate light to send information. Fiber optics is one example. You can also encode audio signals into a pwm signal and send it as IR light to a receiver that filters out the pwm frequency and passes the audio portion. It can then be amplified and listened to. The old Mimms books have several encoding methods listed for LEDs. PWM is just one example.
     
  8. shortbus

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    Sep 30, 2009
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