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Related Concept Videos

Active Filters01:25

Active Filters

Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency. The transfer function for a first-order low-pass active filter is:

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Related Experiment Video

Updated: Jul 9, 2026

Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters
15:25

Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters

Published on: February 4, 2018

Transverse grating-assisted narrow-bandwidth acousto-optic tunable filter.

E G Paek, J Y Choe, T K Oh

    Optics Letters
    |December 19, 2007
    PubMed
    Summary

    This study introduces a novel acousto-optic tunable filter with a narrow spectral bandwidth and rapid tuning. This optical filter demonstrates a 0.2 nm bandwidth and 10-microsecond tuning for advanced photonic applications.

    Area of Science:

    • Photonics
    • Optical Engineering
    • Materials Science

    Background:

    • Acousto-optic tunable filters (AOTFs) are crucial components in various photonic systems.
    • Existing AOTFs often face limitations in tuning speed, spectral bandwidth, or continuous tuning range.

    Purpose of the Study:

    • To experimentally demonstrate a novel acousto-optic tunable filter with enhanced performance characteristics.
    • To achieve a narrow spectral bandwidth and fast tuning capability for improved optical signal processing.

    Main Methods:

    • Development of an acousto-optic tunable filter utilizing an acousto-optic beam deflector.
    • Integration of a diffraction grating with its grating vector oriented transverse to the light propagation direction.
    • Characterization of the filter's spectral bandwidth, tuning speed, and tuning range.

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    Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters
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    Main Results:

    • The experimental filter achieved a narrow spectral bandwidth of 0.2 nm at 1550 nm.
    • Demonstrated a fast tuning capability with a response time of 10 microseconds.
    • Exhibited a continuous tuning range of approximately 50 nm.

    Conclusions:

    • The developed acousto-optic tunable filter offers significant improvements in spectral resolution and tuning speed.
    • This technology holds potential for applications in high-speed optical communications, spectroscopy, and sensing.
    • The transverse grating vector configuration is key to achieving the observed performance.