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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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Modulation formats for multi-core fiber transmission.

B J Puttnam, T A Eriksson, J-M Delgado Mendinueta

    Optics Express
    |January 22, 2015
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    Summary
    This summary is machine-generated.

    New multi-core formats for optical fibers exploit low skew between cores, offering significant advantages. Core-coding formats show promise for long-distance transmission with improved power efficiency and extended reach.

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    Area of Science:

    • Optical Communications
    • Photonics
    • Information Theory

    Background:

    • High-dimensional modulation formats are crucial for increasing data rates in optical fibers.
    • Multi-core fibers (MCFs) offer increased capacity but face challenges with inter-core skew.
    • Spatial superchannels enable parallel data transmission.

    Purpose of the Study:

    • To investigate novel high-dimensional modulation formats for multi-core fibers and spatial superchannels.
    • To leverage low inter-core skew in MCFs for enhanced transmission formats.
    • To evaluate the performance of 'core-coding' and set-partitioning techniques for multi-core transmission.

    Main Methods:

    • Development of 'multi-core' modulation formats exploiting MCF core skew.
    • Transposition of pulse position modulation to the spatial domain.
    • Investigation of 'core-coding' modulation formats, including comparisons with polarization switched quaternary phase shift keying.
    • Application of set-partitioning to multi-core formats with error correction coding.

    Main Results:

    • 'Multi-core' formats offer advantages over conventional formats transmitted independently in each core.
    • A core-coding format achieves similar efficiency to polarization switched quaternary phase shift keying but with half the optical power.
    • Set-partitioning applied to multi-core formats yields nearly 3 dB asymptotic power efficiency advantage for high core counts.
    • Experimental validation shows up to 1.8 dB reduction in required optical signal-to-noise ratio and up to 20% increased transmission reach.

    Conclusions:

    • Exploiting low inter-core skew in MCFs enables efficient 'multi-core' modulation formats.
    • Core-coding and set-partitioning techniques significantly enhance power efficiency and transmission reach in multi-core fiber systems.
    • These advancements hold potential for improving non-linear tolerance and extending the reach of long-distance optical communication networks.