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Related Concept Videos

What is a Mode?01:07

What is a Mode?

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The mode is one of the commonly used measures of a central tendency. It is defined as the most frequent value in a data set.
There can be more than one mode in a data set if multiple values have the same highest frequency. For instance, suppose that the Statistics exam scores of 20 students are: 50; 53; 59; 59; 63; 63; 72; 72; 72; 72; 72; 76; 78; 81; 83; 84; 84; 84; 90; 93. Here, the mode is 72, as it occurs most frequently, five times.
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Mechanical ventilators are life-saving devices that support or replace spontaneous breathing. They deliver breaths to patients through varying methods known as ventilator modes. Understanding these modes is critical for healthcare providers managing patients with respiratory failure.
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A close look at earthquakes provides evidence for the conditions appropriate for resonance, standing waves, and constructive and destructive interference. A building may vibrate for several seconds with a driving frequency matching the building's natural frequency of vibration; this produces a resonance that results in one building collapsing while the neighboring buildings do not. Often, buildings of a certain height are devastated, while other taller buildings remain intact. This...
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Modes of Standing Waves: II01:04

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The starting point for expressing the modes of standing waves is understanding the boundary conditions that the waves must follow. The boundary conditions are derived from the physical understanding of how the standing waves are sustained, that is, how the vibrating particles of the medium behave at the boundaries imposed on them.
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Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
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A Bipolar Junction Transistor (BJT) is a versatile component in electronics, functioning in four distinct modes based on the biasing of its junctions: active, saturation, cut-off, and inverted modes.
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Updated: Feb 13, 2026

Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
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Two-mode contra-directional coupler based on superposed grating.

Xiangjie Zhao, Yuxi Wang, Qingzhong Huang

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    |March 10, 2018
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    Summary
    This summary is machine-generated.

    We developed a novel two-mode grating assisted contra-directional coupler (TGACC) that filters two mode channels simultaneously. This device enhances functionality and reduces size in mode-division multiplexing (MDM) systems.

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    Area of Science:

    • Photonics and optical engineering
    • Integrated optics
    • Waveguide devices

    Background:

    • Mode-division multiplexing (MDM) systems offer increased data capacity.
    • Efficient mode filtering and switching are crucial for advanced optical communication systems.
    • Existing devices often have limitations in simultaneous multi-mode handling and footprint.

    Purpose of the Study:

    • To propose and demonstrate a novel two-mode grating assisted contra-directional coupler (TGACC).
    • To achieve simultaneous filtering of two mode channels using a single device.
    • To enhance the functionality and reduce the physical size of MDM systems.

    Main Methods:

    • Utilizing a superposed grating with two grating components for simultaneous mode filtering.
    • Employing finite-difference time-domain (FDTD) simulation to analyze the TGACC structure.
    • Applying apodization techniques to minimize band sidelobes, crosstalk, and back-reflections.

    Main Results:

    • Demonstrated a mode-channel switchable TGACC with a 2.54nm-wide wavelength band centered at 1548.0nm.
    • Achieved simultaneous filtering of two mode channels via thermal-optic tuning (50K).
    • Confirmed the reduction of band sidelobes, crosstalk, and back-reflections through apodization.

    Conclusions:

    • The developed TGACC effectively filters two mode channels simultaneously, offering enhanced functionality for MDM systems.
    • The device's integrated design contributes to a reduced footprint, beneficial for compact optical systems.
    • Thermal-optic tuning provides a practical method for mode-channel switching in the TGACC.