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Related Concept Videos

Double Resonance Techniques: Overview01:12

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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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A clipper circuit is a fundamental wave-shaping device that harnesses the unique properties of diodes to alter and control waveform characteristics. This technology is widely used in electronic devices, especially in television and radar communication systems, where it enhances waveform modulation in both transmitters and receivers.
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Directional relays, essential for managing unidirectional fault currents, enhance the safety and efficiency of power systems. On power lines equipped with directional relays, faults downstream (to the right) of the current transformer typically cause the fault current to lag the bus voltage by approximately 90 degrees, known as the forward direction. In contrast, upstream (left-side) faults may result in the fault current leading the bus voltage by nearly 90 degrees, termed the reverse...
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Two-period contra-directional grating assisted coupler.

M T Boroojerdi, M Ménard, A G Kirk

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    Summary
    This summary is machine-generated.

    We developed a novel integrated add-drop filter using a two-period grating coupler. This device simultaneously filters two independent optical channels, allowing for independent design of output channels and bandwidths.

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    Area of Science:

    • Photonics
    • Optical Engineering
    • Integrated Optics

    Background:

    • Integrated optical filters are crucial components in Wavelength Division Multiplexing (WDM) systems.
    • Existing add-drop filters often lack the flexibility to manage multiple independent channels efficiently.

    Purpose of the Study:

    • To design, analyze, and experimentally validate a novel integrated add-drop filter.
    • To demonstrate simultaneous filtering of two independent optical channels.
    • To enable independent control over output channel characteristics.

    Main Methods:

    • Device design based on a contra-directional grating assisted coupler with two different periods.
    • Performance analysis using Fourier analysis.
    • Numerical simulations employing the eigenmode expansion method.
    • Experimental characterization of fabricated devices on a silicon-on-insulator platform.

    Main Results:

    • The two-period grating coupler enables simultaneous filtering of two independent channels.
    • Experimental results confirm Fourier analysis and simulations.
    • The drop port response is a superposition of responses from single-period gratings.
    • Independent design of output channels and their bandwidths is achievable.

    Conclusions:

    • The proposed two-period grating-based add-drop filter offers enhanced functionality for optical communication systems.
    • This design provides independent control over multiple optical channels, improving spectral efficiency.
    • The demonstrated device is fabricated using standard silicon photonics technology.