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相关概念视频

Energy Stored In A Coaxial Cable01:31

Energy Stored In A Coaxial Cable

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A coaxial cable consists of a central copper conductor used for transmitting signals, followed by an insulator shield, a metallic braided mesh that prevents signal interference, and a plastic layer that encases the entire assembly.
In the simplest form, a coaxial cable can be represented by two long hollow concentric cylinders in which the current flows in opposite directions. The magnetic field inside and outside the coaxial cable is determined by using Ampère's law. The magnetic...
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Uniform Depth Channel Flow: Problem Solving01:18

Uniform Depth Channel Flow: Problem Solving

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To calculate the flow rate for a trapezoidal channel, first, identify the bottom width, side slope, and flow depth of the channel. The cross-sectional area (A) corresponding to the depth of flow (y), channel bottom width (B), and side slope (θ) is determined by:Next, calculate the wetted perimeter, which includes the bottom width and the sloped side lengths in contact with the water. Using the values of the cross-sectional area and the wetted perimeter, determine the hydraulic radius by...
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Stereoisomerism02:52

Stereoisomerism

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Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
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Uniform depth channel flow keeps fluid depth consistent along channels such as irrigation canals. In natural channels, such as rivers, approximate uniform flow is often assumed. This condition occurs when the channel’s bottom slope matches the energy slope, balancing potential energy lost from gravity with head loss due to shear stress. This balance prevents depth changes along the channel length, resulting in a steady, uniform flow.Uniform flow in open channels with a constant cross-section...
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Properties of Fourier Transform II01:24

Properties of Fourier Transform II

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The Fourier Transform (FT) is an essential mathematical tool in signal processing, transforming a time-domain signal into its frequency-domain representation. This transformation elucidates the relationship between time and frequency domains through several properties, each revealing unique aspects of signal behavior.
The Frequency Shifting property of Fourier Transforms highlights that a shift in the frequency domain corresponds to a phase shift in the time domain. Mathematically, if x(t) has...
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IR Frequency Region: X–H Stretching01:24

IR Frequency Region: X–H Stretching

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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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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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基于直角编码的空间通道切换:打破光学复杂化系统中的维度障碍.

Weihang Zhong, Lixun Wu, Zituo Wu

    Optics letters
    |July 1, 2025
    PubMed
    概括

    本研究介绍了一种新的光学直角编码 (OC) 方法,用于WDM和SDM系统中的空间通道切换. 开发的设备简化了切换操作,并提高了光通信的可扩展性.

    科学领域:

    • 光学通信系统 光学通信系统
    • 光子学是指光子学的使用方法.
    • 信号处理 信号处理

    背景情况:

    • 空间通道切换设备对于多通道波长分割多重复合 (WDM) 和空间分割多重复合 (SDM) 光学系统至关重要.
    • 目前的设备在操作复杂性和可扩展性方面面临挑战.

    研究的目的:

    • 为空间通道切换提出一种新的光学直角编码 (OC) 模式构建方法.
    • 为光通信系统开发一种简化和可扩展的空间通道切换装置.

    主要方法:

    • 开发了一种使用相梯度编码的OC模式构造方法.
    • 将编码方法映射到光纤阵列中的分散空间通道.
    • 设计了一个空间通道切换设备,包括光纤阵列,模式转换器和通道切换平面.
    • 实验证明了一种带有五相罩的双向模式转换器.

    主要成果:

    • 成功切换了7个空间通道与相应的相位分布.
    • 基于OC的设备消除了在特定区域进行相位调整的需要.
    • 证明了道切换过程的简化操作复杂性.

    结论:

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    • 拟议的基于OC的空间通道切换设备提高了通道可扩展性和系统性能.
    • 这种方法提供了一种可行的解决方案,以克服光学复杂化系统中的维度障碍.