Frequency modulated laser - transmission of voice

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SUMMARY

Frequency modulation of a laser can successfully transmit voice information, as confirmed by forum participants. A photo cell can indeed receive this modulated signal, allowing for audio retrieval. The discussion references a project on SciToys that demonstrates amplitude modulation, while one user shares their experience using PWM (Pulse Width Modulation) and a low pass filter to extract audio from the laser signal.

PREREQUISITES
  • Understanding of frequency modulation techniques
  • Familiarity with photo cell operation and signal detection
  • Knowledge of PWM (Pulse Width Modulation) principles
  • Basic electronics concepts, including low pass filtering
NEXT STEPS
  • Research frequency modulation techniques in optical communication
  • Explore the use of photo cells in signal detection
  • Learn about PWM applications in audio transmission
  • Investigate low pass filter design for audio signal processing
USEFUL FOR

Electronics enthusiasts, optical communication engineers, and anyone interested in audio transmission technologies using laser modulation.

Jay Lakoda
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If I modulated a laser frequency with voice, would a photo cell be capable of receiving that information?
 
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Jay Lakoda said:
If I modulated a laser frequency with voice, would a photo cell be capable of receiving that information?

A very good website with a lot of fun activiites: http://scitoys.com/ has an example project along these lines (amplitude modulation though, not frequency modulation).
http://sci-toys.com/scitoys/scitoys/light/light.html#laser_communicator
 
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I have done it with PWM. Low pass filter the signal at the detector and you have your audio.
 
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