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Related Concept Videos

Time and frequency -Domain Interpretation of Phase-lead Control01:24

Time and frequency -Domain Interpretation of Phase-lead Control

Phase-lead controllers are commonly used in various control systems to enhance response speed and stability. Adjusting the brightness on a television screen offers a practical example of phase-lead control. When contrast is enhanced, a phase-lead controller is employed. Mathematically, phase-lead control is identified when the first parameter is smaller than the second.
The design of phase-lead control involves the strategic placement of poles and zeros to balance steady-state error and system...
Time and frequency -Domain Interpretation of Phase-lag Control01:21

Time and frequency -Domain Interpretation of Phase-lag Control

Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any finite,...

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Related Experiment Video

Updated: Jun 12, 2026

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
08:39

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Published on: January 28, 2019

Tunable wavelength multi/demultiplexer using a variable retardation phase plate.

Y Fujii

    Applied Optics
    |June 23, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Researchers developed a tunable wavelength multi/demultiplexer. This device uses an electrically controlled phase plate for variable optical signal separation, demonstrating feasibility in optical communication systems.

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    Area of Science:

    • Photonics and Optical Engineering
    • Materials Science

    Background:

    • Optical communication systems rely on efficient wavelength division multiplexing (WDM) for data transmission.
    • Traditional multi/demultiplexers often lack tunability, limiting flexibility in optical networks.

    Purpose of the Study:

    • To report a novel tunable wavelength multi/demultiplexer.
    • To demonstrate the feasibility of using a variable retardation phase plate for optical signal manipulation.

    Main Methods:

    • The study utilizes an electrically controlled lithium niobate (LiNbO3) phase plate.
    • This phase plate provides variable retardation to control optical path differences.

    Main Results:

    • Experimental demonstration of a functional multi/demultiplexer with tunable wavelength capabilities.
    • The device successfully separated and combined optical signals based on wavelength control.

    Conclusions:

    • Electrically controlled phase plates offer a viable method for creating tunable optical multi/demultiplexers.
    • This technology holds potential for enhancing the flexibility and efficiency of optical communication networks.