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Related Concept Videos

Passive Filters01:27

Passive Filters

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 frequency...

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Optical-mode filters using coupling between two nonidentical waveguides.

M Kobayashi, H Terui, K Egashira

    Applied Optics
    |February 23, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Novel optical-waveguide mode filters were developed using mode-selective coupling and attenuation. These filters effectively reduce unwanted modes in optical signals, demonstrating high performance for both TE(0) and TM(0) modes.

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    Area of Science:

    • Photonics and Optical Engineering
    • Materials Science for Optical Devices
    • Waveguide Technology

    Background:

    • Optical waveguides are crucial for transmitting light signals.
    • Efficient filtering of specific optical modes is essential for signal integrity.
    • Existing mode filtering techniques face challenges in performance and fabrication.

    Purpose of the Study:

    • To propose and demonstrate novel optical-waveguide mode filters.
    • To achieve selective coupling and attenuation for desired optical modes.
    • To fabricate and characterize filters for both TE(0) and TM(0) modes.

    Main Methods:

    • Utilized mode-selective coupling between nonidentical waveguides.
    • Incorporated attenuation in a lossy waveguide for mode suppression.
    • Fabricated filters from glass compositions using radio-frequency (rf) sputtering.
    • Measured insertion losses and attenuation of undesirable modes for TE(0) and TM(0) filters.

    Main Results:

    • Successfully demonstrated novel optical-waveguide mode filters.
    • Achieved low insertion losses: 2.1 dB for TE(0) and 1.1 dB for TM(0) filters.
    • Obtained high attenuation for undesirable modes: 16.8 dB for TE(0) and 21.6 dB for TM(0) filters.

    Conclusions:

    • The proposed mode-selective coupling and attenuation method is effective for optical-waveguide mode filtering.
    • Fabricated filters exhibit excellent performance with low insertion loss and high mode rejection.
    • These novel filters hold promise for advanced optical communication and signal processing systems.