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Related Experiment Video

Updated: Apr 27, 2026

Quasi-light Storage for Optical Data Packets
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Bidirectional hybrid PM-based RoF and VCSEL-based VLLC system.

Chung-Yi Li, Hai-Han Lu, Ching-Hung Chang

    Optics Express
    |July 1, 2014
    PubMed
    Summary
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    This study demonstrates a novel hybrid system integrating radio-over-fiber (RoF) and visible laser light communication (VLLC). The system achieves excellent performance for broadband services over fiber and free-space links.

    Area of Science:

    • Optoelectronics
    • Optical Communications
    • Hybrid Systems

    Background:

    • Radio-over-fiber (RoF) and visible laser light communication (VLLC) are key technologies for integrated networks.
    • Existing systems face challenges in bidirectional transmission and signal conversion.
    • Vertical cavity surface emitting lasers (VCSELs) offer potential for cost-effective optical transceivers.

    Purpose of the Study:

    • To propose and demonstrate a bidirectional hybrid RoF and VLLC system.
    • To integrate injection-locked VCSEL-based converters and optical interleavers for enhanced functionality.
    • To assess the system's performance for broadband integrated services.

    Main Methods:

    • Utilizing injection-locked VCSEL-based phase modulation (PM)-to-intensity modulation (IM) converters.

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  • Employing optical interleavers (ILs) for signal multiplexing and demultiplexing.
  • Implementing a bidirectional architecture for upstream and downstream data transmission.
  • Phase-remodulating downstream light for RoF uplink transmission.

    • Main Results:

    • Successful demonstration of a bidirectional hybrid RoF and VLLC system.
    • Brilliant bit error rate (BER) and eye diagram performance.
    • System tested over 40-km single-mode fiber (SMF) and 12-m free-space transmission.
    • First-time use of injection-locked VCSEL-based PM-to-IM converters and optical ILs in such hybrid systems.

    Conclusions:

    • The proposed system is highly attractive for integrating fiber backbones and indoor networks.
    • It enables the provision of broadband integrated services, including Internet and telecommunication.
    • The innovative use of VCSELs and optical interleavers enhances system capabilities and performance.