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相关概念视频

LC Circuits01:21

LC Circuits

2.6K
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...
2.6K

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相关实验视频

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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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灵活的广播UWOC系统使用基于LCVR的可调光学分离器.

Chao Zhang, Ning Deng, Yufan Zhang

    Optics letters
    |June 1, 2023
    PubMed
    概括

    本研究介绍了一种新型的水下无线光通信 (UWOC) 广播系统,使用液晶变量延迟器 (LCVR) 和极化束分割器 (PBS). 该系统有效地将电力分配给用户,提高UWOC网络的灵活性和防干扰能力.

    科学领域:

    • 光学工程是指光学工程.
    • 无线通信无线通信
    • 光子学 是一个光子学.

    背景情况:

    • 水下无线光通信 (UWOC) 面临着能源消耗和有限的通信距离的挑战,原因是几何损失和水衰减.
    • 在UWOC系统中的高灵敏度光子探测器通常具有有限的动态范围,限制性能.

    研究的目的:

    • 提出和演示一个广播UWOC系统,根据特定的频道条件分配用户功率.
    • 提高UWOC网络的灵活性和防干扰能力.

    主要方法:

    • 使用液晶变量减速器 (LCVR) 和偏光束分割器 (PBS) 来控制光的偏光和功率分配.
    • 调整了LCVR的交流电压,以动态改变不同用户的光偏振比例.
    • 设计和测试单用户和双用户UWOC系统,以验证功率调节的有效性.

    主要成果:

    • 实现了双用户的19.17dB和17.33dB的输出功率动态范围,插入损失最小 (0.91dB和1.26dB).
    • 通过调整 LCVR 电压,证明比特错误率 (BER) 低于前期错误校正 (FEC) 极限.
    • 将可调节的通信距离范围从4.2米扩大到13.19米.

    结论:

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    • 拟议的基于LCVR和PBS的系统有效地分配了广播UWOC系统中的电力.
    • 该系统增强了防干扰能力和网络灵活性,证明了多用户UWOC应用的可行性.