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Optical Communications Experiments at 6328 A and 10.6 micro.

R F Lucy, K Lang

    Applied Optics
    |January 14, 2010
    PubMed
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    Coherent optical communication systems are more sensitive to atmospheric turbulence than noncoherent systems. However, at 10.6 micrometers, coherent systems show reduced susceptibility to atmospheric effects compared to 6328 Angstroms.

    Area of Science:

    • Optical communication systems engineering
    • Atmospheric optics and turbulence effects

    Background:

    • Optical communication relies on transmitting data via light signals.
    • Atmospheric conditions, like turbulence, can degrade signal quality.
    • Different detection techniques (coherent vs. noncoherent) have varying sensitivities to such degradations.

    Purpose of the Study:

    • To compare the performance of noncoherent and coherent detection techniques in optical communication.
    • To evaluate the impact of atmospheric turbulence on these systems.
    • To investigate the wavelength dependency of turbulence effects on coherent systems.

    Main Methods:

    • Conducted diagnostic optical communication experiments over a 1-km atmospheric path.
    • Utilized three receiver-transmitter configurations with variable apertures.

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  • Performed a coherent homodyne experiment at 10.6 micrometers over a 2-km path.

    • Main Results:

    • Coherent systems exhibited significantly greater fading than noncoherent systems due to atmospheric turbulence.
    • This indicates higher sensitivity of coherent systems to turbulence-induced wavefront distortions.
    • Coherent systems at 10.6 micrometers were less susceptible to atmospheric turbulence than at 6328 Angstroms.

    Conclusions:

    • Noncoherent detection offers superior robustness against atmospheric turbulence in optical communication.
    • Wavelength selection is critical for mitigating turbulence effects in coherent optical communication systems.
    • Coherent systems at longer wavelengths (10.6 micrometers) are more resilient to atmospheric disturbances.