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Related Concept Videos

Passive Filters01:27

Passive Filters

1.2K
Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources.
Low-Pass Filters
Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff...
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Active Filters01:25

Active Filters

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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: Apr 25, 2026

Fabrication of Silica Ultra High Quality Factor Microresonators
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Fabrication of Silica Ultra High Quality Factor Microresonators

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Packaged, high-Q, microsphere-resonator-based add-drop filter.

Pengfei Wang, Ming Ding, Ganapathy Senthil Murugan

    Optics Letters
    |August 29, 2014
    PubMed
    Summary
    This summary is machine-generated.

    This study demonstrates a novel silica microsphere add-drop filter. The cost-effective device offers high performance for optical communication systems.

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    Area of Science:

    • Photonics
    • Optical Engineering
    • Materials Science

    Background:

    • Add-drop filters are crucial components in optical communication networks.
    • Microsphere resonators offer high quality factors and compact footprints.
    • Integrating microsphere resonators with fiber optics presents fabrication challenges.

    Purpose of the Study:

    • To theoretically and experimentally demonstrate a packaged add-drop filter using a silica microsphere resonator and fiber tapers.
    • To present a fabrication method for stabilizing the microsphere resonator.
    • To evaluate the optical performance of the developed add-drop filter.

    Main Methods:

    • Fabrication of a silica microsphere resonator (153 μm diameter) using a two-step UV curable polymer process.
    • Coupling the microsphere to two tapered microfibers (1.5 μm diameter) acting as add and drop ports.
    • Characterization of the device at ~1550 nm for optical performance evaluation.

    Main Results:

    • Achieved a high loaded quality factor (Q-factor) of 0.9×10^5.
    • Obtained a free spectral range (FSR) of approximately 104 pm.
    • Demonstrated parallel coupling of tapered fibers in an add-drop configuration.

    Conclusions:

    • The demonstrated silica microsphere add-drop filter is theoretically and experimentally validated.
    • The fabrication process ensures resonator stability and efficient coupling.
    • The device exhibits advantages like ease of fabrication, low cost, and compatibility with existing fiber systems, making it suitable for optical communications.