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In IR spectroscopy, signals produced by the X−H bonds (such as C−H, O−H, or N−H) can be observed in the frequency range of  2700–4000 cm–1. The C−H stretching vibration forms sharp bands in the region 2850–3000 cm–1. The presence of the O−H stretching vibration leads to the forming of an absorption band in the frequency range 3650–3200 cm−1. At the same time, N−H stretching can be confirmed by absorption bands in...
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Electromagnetic waves are categorized according to their wavelengths and frequencies, giving the electromagnetic spectrum. These waves are classified as radio, infrared, ultraviolet, etc. Radio waves refer to electromagnetic radiation with wavelengths ranging from millimeters to kilometers. Radio waves are commonly used for audio communications (i.e., radios) and typically result from an alternating current in the wires of a broadcast antenna. They cover a broad wavelength range and are used...
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相关实验视频

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Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
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超越光纤:在自由空间光通信中朝着太赫兹带宽发展

Rahat Ullah1,2,3, Sibghat Ullah4, Jianxin Ren1,2,3

  • 1Institute of Optics and Electronics, Nanjing University of Information Science & Technology, Nanjing 210044, China.

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概括

特拉赫兹 (THz) 和自由空间光学 (FSO) 通信为6G网络提供超高的数据速率,但面临着大气吸收挑战. 研究探讨了诸如自适应光学和人工智能等解决方案,以增强THz-FSO系统的可靠性,安全性和下一代网络.

关键词:
FSO通信系统的通信系统THz通信系统的通信系统.这就是THz带宽.集成的THz-FSO系统.软件定义网络是软件定义的网络.

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科学领域:

  • 电信工程 电信工程 电信工程
  • 光学通信是指光学通信.
  • 无线通信无线通信

背景情况:

  • 太赫兹 (THz) 通信对于像6G这样的下一代网络至关重要,它提供超高的数据速率.
  • 将THz与自由空间光学 (FSO) 集成,旨在克服带宽限制.
  • 大气吸收,特别是在500 GHz以上,严重限制了THz-FSO范围,尽管有680 GHz的窗口.

研究的目的:

  • 综合审查THz通信,重点关注其与FSO系统的集成.
  • 分析诸如大气吸收等挑战,并探索潜在的解决方案.
  • 评估THz-FSO技术的新兴应用和未来研究方向.

主要方法:

  • 对高功率THz源 (量子级联激光器,光子混合器,自由电子激光器) 的最新进展进行审查.
  • 检查信号降解的缓解技术:自适应光学,基于ML的光束对齐,低损耗材料.
  • 评估THz-FSO与软件定义网络 (SDN) 和多频段自适应通信框架中的光学/射频技术的整合.

主要成果:

  • 使用先进的THz源可以实现超高的数据速率.
  • 适应光学,ML和新材料在克服大气吸收方面显示出希望.
  • 与SDN和多频段通信集成的混合THz-FSO系统提高了可靠性和范围.

结论:

  • 对于超高速和安全的下一代网络,THz-FSO技术具有显著的前景.
  • 通过混合架构,人工智能和先进的波导来解决大气衰减至关重要.
  • 未来的研究应该专注于人工智能优化,能源效率和THz通信的量子加密.