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Related Concept Videos

LC Circuits01:21

LC Circuits

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An LC circuit consists of an inductor and a capacitor, either in series or parallel. Consider a charged capacitor connected with an inductor in series. Before the switch is closed, all the energy of the circuit is stored in the electric field of the capacitor. When the switch is closed, the capacitor begins to discharge, producing a current in the circuit. The current, in turn, creates a magnetic field in the inductor. Because of the induced emf in the inductor, the current cannot change...
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Flexible broadcast UWOC system using an LCVR-based tunable optical splitter.

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    This study introduces a novel broadcast system for underwater wireless optical communication (UWOC) using liquid crystal variable retarders (LCVRs) and polarization beam splitters (PBSs). The system efficiently allocates power to users, enhancing flexibility and anti-jamming capabilities in UWOC networks.

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    Area of Science:

    • Optical Engineering
    • Wireless Communication
    • Photonics

    Background:

    • Underwater wireless optical communication (UWOC) faces challenges with energy consumption and limited communication distances due to geometric loss and water attenuation.
    • High-sensitivity photon detectors in UWOC systems often have limited dynamic ranges, restricting performance.

    Purpose of the Study:

    • To propose and demonstrate a broadcast UWOC system that allocates user power based on specific channel conditions.
    • To improve the flexibility and anti-jamming capabilities of UWOC networks.

    Main Methods:

    • Utilized liquid crystal variable retarders (LCVRs) and polarization beam splitters (PBSs) to control light polarization and power allocation.
    • Adjusted the alternating current (AC) voltage of LCVRs to dynamically change light polarization proportions for different users.
    • Designed and tested single-user and dual-user UWOC systems to verify power adjustment effectiveness.

    Main Results:

    • Achieved output power dynamic ranges of 19.17 dB and 17.33 dB for dual users, with minimal insertion loss (0.91 dB and 1.26 dB).
    • Demonstrated that bit error rates (BERs) fell below the forward error correction (FEC) limit by adjusting LCVR voltage.
    • Extended the adjustable communication distance range from 4.2 m to 13.19 m.

    Conclusions:

    • The proposed LCVR and PBS-based system effectively allocates power in broadcast UWOC systems.
    • The system enhances anti-jamming capabilities and network flexibility, proving viable for multi-user UWOC applications.