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Related Experiment Videos

71-Mbit/s ultraviolet-B LED communication link based on 8-QAM-OFDM modulation.

Xiaobin Sun, Zhenyu Zhang, Anas Chaaban

    Optics Express
    |October 19, 2017
    PubMed
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    This study demonstrates a high-speed ultraviolet-B (UVB) communication link using advanced modulation techniques. The system achieves impressive data rates, paving the way for novel free-space optical communication applications.

    Area of Science:

    • Optical Communications
    • Free-Space Optics
    • Semiconductor Devices

    Background:

    • Ultraviolet-B (UVB) light offers unique properties for optical communication, including near-solar-blind operation.
    • Traditional free-space optical communication systems often require line-of-sight, limiting their applicability.
    • Developing high-speed, robust UVB communication links is crucial for expanding wireless optical communication capabilities.

    Purpose of the Study:

    • To demonstrate a functional ultraviolet-B (UVB) communication link.
    • To evaluate the performance of quadrature amplitude modulation (QAM) orthogonal frequency-division multiplexing (OFDM) in a UVB system.
    • To achieve high data rates and assess link performance under varying alignment conditions.

    Main Methods:

    • Implementation of a UVB communication link using a 294-nm UVB-light-emitting-diode (UVB-LED).

    Related Experiment Videos

  • Utilizing quadrature amplitude modulation (QAM) orthogonal frequency-division multiplexing (OFDM) for data transmission.
  • Testing the system with different QAM-OFDM schemes (8-QAM and 2-QAM) and evaluating performance at varying angles.

    • Main Results:

    • Achieved a data rate of 71 Mbit/s using 8-QAM-OFDM under perfect alignment.
    • Demonstrated a data rate of 23.6 Mbit/s using 2-QAM-OFDM with a 12-degree misalignment, establishing a diffuse line-of-sight (LOS) link.
    • Measured bit-error rates (BER) significantly below the forward error correction (FEC) threshold, indicating robust communication.

    Conclusions:

    • The demonstrated OFDM-based UVB communication link supports high data rates.
    • The system successfully establishes both line-of-sight and diffuse line-of-sight links.
    • This technology enables high-speed non-line-of-sight free-space optical communications.