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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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Switching behavior in Bipolar Junction Transistors (BJTs) is a fundamental aspect utilized in various electronic circuits, particularly for digital logic applications like switches and amplifiers. In a typical switching circuit, a BJT alternates between cut-off and saturation modes, corresponding to the "off" and "on" states, respectively, thus behaving like an ideal switch.
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Related Experiment Video

Updated: Jun 26, 2025

Patterning via Optical Saturable Transitions - Fabrication and Characterization
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Compact supermode switch for photonic matrix processing.

Jiapeng Luan, Yue Qin, Zelu Wang

    Optics Letters
    |May 15, 2024
    PubMed
    Summary

    A novel 2x2 optical switch utilizes supermode thermo-optic effects for compact photonic processing. This device offers high extinction ratios and low losses, improving scalability for coherent matrix processing networks.

    Area of Science:

    • Photonics
    • Optical Engineering
    • Materials Science

    Background:

    • Coherent photonic matrix processing networks are crucial for advanced computing.
    • Mach-Zehnder interferometer (MZI)-based switches are commonly used but can be bulky.
    • There is a need for more compact and scalable switching solutions.

    Purpose of the Study:

    • To propose and demonstrate a compact 2x2 optical switch.
    • To utilize differential effective thermo-optic (TO) coefficients of waveguide supermodes.
    • To offer a more scalable alternative to MZI-based switches for photonic matrix processing.

    Main Methods:

    • Design and fabrication of a 2x2 switch with a total waveguide width of 1.335 μm.
    • Implementation of a novel supermode coupler with a wideband 3-dB coupling ratio.

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  • Experimental characterization of on-off extinction ratios (ERs) and insertion losses (ILs).

    • Main Results:

    • Achieved ERs ranging from 24.1 to 38.9 dB over a 135 nm bandwidth.
    • Measured ILs below 0.3 dB (bar) and 0.4 dB (cross) over a 100 nm bandwidth.
    • Demonstrated a waveguide width error tolerance of +/-30 nm.

    Conclusions:

    • The proposed switch is a compact and efficient alternative to MZI-based switches.
    • The device enhances scalability for programmable coherent meshes in matrix processing.
    • Potential for increased integration density without compromising accuracy or operational wavelength.