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相关概念视频

Confocal Fluorescence Microscopy01:16

Confocal Fluorescence Microscopy

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Confocal microscopy is an advanced microscopic technique. The prime advantage of the confocal microscope over other microscopy techniques is its ability to block the out-of-focus light from the illuminated samples using pinholes. It is widely used with fluorescence optics to obtain high-resolution, sharp contrast images. Unlike optical microscopes, confocal microscopes use a focused beam of light laser to scan the entire sample surface at different z-planes. These microscopes are, therefore,...
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相关实验视频

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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

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极地编码的SCMA-OCDM基于混乱编码的SLM.

Yu Bai, Bo Liu, Jianxin Ren

    Optics express
    |November 22, 2024
    PubMed
    概括

    使用混沌编码选择性映射 (CS_SLM) 的新极性编码稀疏代码多重访问 (SCMA) 方案增强了被动光网络 (PON). 这种方法提高了下一代PON的可靠性,安全性和光谱效率.

    科学领域:

    • 光学通信网络是指光学通信网络.
    • 信号处理 信号处理
    • 信息理论是信息理论.

    背景情况:

    • 被动光网络 (PON) 需要先进的调制和编码方案,以实现更高的数据速率和更好的性能.
    • 正角频率分割多重复合 (OFDM) 被广泛使用,但在光谱效率和反干扰能力方面存在局限性.
    • 简单的代码多重访问 (SCMA) 提供了更好的频谱效率和多用户访问能力.

    研究的目的:

    • 为未来的PONs提出和评估一种新的极性编码SCMA方案,结合与正交曲线分割多重复合 (OCDM) 和混乱编码选择性映射 (CS_SLM).
    • 提高PON系统的可靠性,安全性和光谱效率.
    • 通过联合代检测和解码来提高比特错误率 (BER) 的性能.

    主要方法:

    • 极地编码用于纠错.
    • 为多用户访问和频谱效率提供SCMA.
    • 为了增强抗干扰,对角切片分离多重复合 (OCDM).
    • 混沌编码选择性映射 (CS_SLM) 提高了可靠性和安全性.
    • 在接收器上联合代检测和解码.

    主要成果:

    • 在2公里长的七核光纤上演示了49.42Gb/s的极性编码SCMA-OCDM PON.

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    Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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  • 与SCMA-OFDM相比,实现了0.8dB的接收器灵敏度,BER值为3.8×10−3.
  • 由于降低了峰值到平均功率比率 (PAPR),在BER<10-5的CS_SLM中获得了2.08dB的接收器灵敏度增长,而不是剪切和过 (CAF) 方法.

    • 结论:

    • 拟议的与CS_SLM的极性编码SCMA-OCDM方案是下一代PON的有希望的候选者.
    • 极性编码,SCMA,OCDM和CS_SLM的集成显著提高了系统性能,包括BER,可靠性和安全性.
    • 该计划有效地解决了PON下链广播中的安全问题.