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Multicolor Fluorescence Detection for Droplet Microfluidics Using Optical Fibers
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Low-cost high-speed multichannel fiber-optic correlator.

A G Podoleanu, R K Harding, D A Jackson

    Optics Letters
    |October 27, 2009
    PubMed
    Summary
    This summary is machine-generated.

    This study expands multichannel fiber-optic correlator channels using microwave switchable delay lines. Cost-effective methods were demonstrated, achieving 20 correlation points for a 500-MHz signal without sacrificing speed.

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    Area of Science:

    • Optical Engineering
    • Signal Processing
    • Microelectronics

    Background:

    • Multichannel fiber-optic correlators are crucial for signal processing.
    • Expanding channel capacity often increases cost and complexity.
    • Maintaining high speed during multichannel expansion is a key challenge.

    Purpose of the Study:

    • To investigate methods for expanding the number of channels in a multichannel fiber-optic correlator.
    • To reduce the cost of multichannel architectures without compromising processing speed.
    • To optimize delay line implementation for improved correlation function generation.

    Main Methods:

    • Utilized a microwave switchable delay line to expand correlator channels.
    • Replaced an optical tree with an electrical tree and employed double-gate metal-oxide semiconductor field-effect transistors for AND operations.
    • Implemented a hybrid approach, using optical delays for >5 ns and microwave delays for <5 ns.

    Main Results:

    • Successfully expanded the number of channels in the multichannel fiber-optic correlator.
    • Demonstrated two cost-reduction techniques for the multichannel architecture.
    • Achieved 20 points of the correlation function for a 500-MHz signal.
    • Maintained high processing speed with the implemented methods.

    Conclusions:

    • The proposed methods enable simple expansion of channels in fiber-optic correlators.
    • Cost-effective multichannel architectures can be realized without speed reduction.
    • A hybrid optical-microwave delay implementation is effective for high-speed signal correlation.