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MOSFET: Enhancement Mode01:22

MOSFET: Enhancement Mode

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.
In their basic form, enhancement-mode MOSFETs are typically non-conductive when the gate-source voltage (Vgs) is zero. This default 'off' state means no current...

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Related Experiment Video

Updated: Jun 19, 2026

A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
09:03

A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response

Published on: January 7, 2019

High-performance single-mode fiber-optic switch.

S P Fang, H F Taylor

    Optics Letters
    |October 27, 2009
    PubMed
    Summary
    This summary is machine-generated.

    A novel piezoelectrically actuated four-port Mach-Zehnder switch offers rapid 30-microsecond switching and low 0.25-dB insertion loss. This optical switch maintains crosstalk below -21 dB across all polarizations.

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    Published on: November 22, 2019

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    Area of Science:

    • Photonics and optical engineering
    • Materials science for optical devices

    Background:

    • Mach-Zehnder interferometers are fundamental components in optical switching.
    • Achieving low insertion loss and high crosstalk suppression is critical for optical network performance.

    Purpose of the Study:

    • To demonstrate a piezoelectrically actuated four-port Mach-Zehnder switch.
    • To characterize its switching speed, insertion loss, and crosstalk performance.
    • To detail the fabrication process for practical implementation.

    Main Methods:

    • Utilizing commercial fiber couplers to construct the interferometer.
    • Implementing piezoelectric actuation for dynamic control of the optical path.
    • Precise length matching of interferometer arms for optimal performance.

    Main Results:

    • Demonstrated a switching time of 30 microseconds.
    • Achieved a low insertion loss of 0.25 dB at a 1.3 micrometer wavelength.
    • Exhibited worst-case crosstalk below -21 dB for arbitrary input polarization.

    Conclusions:

    • The developed Mach-Zehnder switch meets key performance metrics for optical communication systems.
    • The fabrication method using commercial components offers a viable route for producing such devices.
    • The device shows potential for high-speed optical signal routing with minimal signal degradation.