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Related Concept Videos

Design Example: Capacitance Multiplier Circuit01:20

Design Example: Capacitance Multiplier Circuit

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In integrated circuit technology, a capacitance multiplier is often utilized to produce a larger capacitance value when a small physical capacitance falls short. This is achieved by a circuit that multiplies capacitance values by a factor of up to 1000, such that a 10-pF capacitor can replicate the performance of a 100-nF capacitor.
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.
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Related Experiment Video

Updated: Jan 17, 2026

Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms
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Compact-size and high mode-scalability spatial-mode multiplexer using multiplexed volume holograms.

Yuta Goto, Satoshi Shinada, Atsushi Okamoto

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    |September 23, 2025
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    Summary
    This summary is machine-generated.

    This study presents a compact spatial mode multiplexer using volume holograms for mode division multiplexing (MDM) transmission. The holographic approach achieves high mode-scalability and excitation ratios, crucial for advanced optical communication systems.

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    Area of Science:

    • Optical Engineering
    • Photonics
    • Telecommunications

    Background:

    • Mode division multiplexing (MDM) is essential for increasing optical fiber communication capacity.
    • Existing MDM solutions often lack compactness and scalability.
    • Volume holograms offer a promising approach for efficient spatial mode manipulation.

    Purpose of the Study:

    • To develop and evaluate a compact spatial mode multiplexer/demultiplexer using multiplexed volume holograms.
    • To optimize hologram recording parameters for effective mode multiplexing.
    • To assess the performance of a back-to-back configuration for MDM transmission.

    Main Methods:

    • Designing and prerecording volume holograms matched to spatial mode electric field distributions.
    • Optimizing exposure dose and compensating incident beam angles during hologram recording.
    • Evaluating the device's performance in a back-to-back configuration, measuring excitation ratios and modal crosstalk.

    Main Results:

    • A compact optical system was realized using volume holograms, two lenses, a fiber array, and a recording medium.
    • An excitation ratio of ≥25 dB was achieved between LP01 and LP11 modes when coupled to a three-mode fiber.
    • Maximum modal crosstalk in the back-to-back configuration was measured at approximately -20 dB, meeting MDM requirements.

    Conclusions:

    • Multiplexed volume holograms provide a compact and highly scalable solution for spatial mode multiplexing in MDM systems.
    • The developed holographic multiplexer demonstrates effective operation with high excitation ratios and low crosstalk.
    • This technology holds significant potential for advancing high-capacity optical communication networks.