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Coherent CO(2) laser communication system with modulable retroreflectors.

G J Olson, H W Mocker, N A Demma

    Applied Optics
    |November 2, 2010
    PubMed
    Summary

    A new carbon dioxide (CO2) laser communication system was developed for high-quality voice transmission over 24 km. This system offers an 80 km range and a 20 dB signal-to-noise ratio improvement over direct-detection methods.

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    Area of Science:

    • Optics and Photonics
    • Telecommunications Engineering
    • Laser Technology

    Background:

    • Free-space optical communication systems are crucial for high-bandwidth data transmission.
    • Carbon dioxide (CO2) lasers offer potential for long-range optical communication due to their wavelength characteristics.
    • Modulable retroreflectors are key components for enabling bidirectional communication in free-space laser systems.

    Purpose of the Study:

    • To develop and evaluate a coherent CO2 laser communication system for high-quality voice transmission.
    • To assess the system's performance over a significant distance (24 km).
    • To compare the system's signal-to-noise ratio (SNR) with traditional direct-detection approaches.

    Main Methods:

    • Development of a coherent CO2 laser transmitter and receiver system.
    • Integration of modulable retroreflectors at a remote site.
    • Field testing of the system over a 24 km communication link.
    • Measurement and comparison of SNR for coherent versus direct-detection systems.

    Main Results:

    • Successful high-quality voice communication was achieved over a 24 km distance.
    • The developed system demonstrated a potential range capability of up to 80 km.
    • A significant improvement of 20 dB in SNR was observed compared to a direct-detection system.

    Conclusions:

    • The coherent CO2 laser communication system is a viable technology for robust, long-range voice transmission.
    • The system's enhanced SNR provides superior performance in free-space optical communication.
    • Further development could extend the system's application to higher data rate communications.