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Related Experiment Video

Updated: Jun 17, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
09:23

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

Optical superheterodyne receiver.

R F Lucy1, K Lang, C J Peters

  • 1Applied Research Laboratory, Sylvania Electronic Systems, Waltham, Massachusetts 02154, USA.

Applied Optics
|January 12, 2010
PubMed
Summary
This summary is machine-generated.

Noncoherent optical detection shows less severe fading than coherent detection in atmospheric optical communications. Fading is weather-dependent for both methods, with optical frequency modulation (FM) mirroring radio frequency (RF) FM characteristics.

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Quasi-light Storage for Optical Data Packets
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Last Updated: Jun 17, 2026

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Published on: February 6, 2014

Area of Science:

  • Optical Communications
  • Atmospheric Optics
  • Signal Detection

Background:

  • Atmospheric optical communication systems face signal fading due to weather conditions.
  • Comparing coherent and noncoherent detection methods is crucial for optimizing system performance.

Purpose of the Study:

  • To compare the fading characteristics of coherent and noncoherent optical detection over a real atmospheric path.
  • To investigate the influence of weather conditions on optical communication signal fading.
  • To demonstrate the analogy between optical and radio frequency (RF) frequency modulation (FM).

Main Methods:

  • Experiments conducted over a 1-km atmospheric path using a 6328 Å laser transmitter.
  • Utilized an optical superheterodyne receiver capable of simultaneous coherent and noncoherent detection.
  • Employed automatic frequency control and a precision angle tracking servo for stable operation.

Main Results:

  • Noncoherent optical detection exhibited less severe signal fading compared to coherent detection.
  • Signal fading characteristics varied significantly with different weather conditions for both detection types.
  • Optical FM demonstrated characteristics similar to RF FM.

Conclusions:

  • Noncoherent detection is more robust against atmospheric fading in optical communication systems.
  • Weather conditions are a critical factor influencing the reliability of optical communication links.
  • The study validates the applicability of FM techniques in optical communications.