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High spatial-density, cladding-pumped 6-mode 7-core fiber amplifier for C-band operation.

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    This study introduces a novel C-band fiber amplifier capable of supporting 42 spatial channels for space division multiplexed transmission, achieving significant gain with minimal noise.

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    Area of Science:

    • Optical Engineering
    • Telecommunications
    • Fiber Optics

    Background:

    • Space division multiplexing (SDM) is crucial for increasing fiber optic communication capacity.
    • Developing high-performance amplifiers for SDM systems presents challenges in managing multiple spatial channels and high pump power.

    Purpose of the Study:

    • To demonstrate a C-band, 6-mode, 7-core fiber amplifier for SDM transmission.
    • To achieve a record number of spatial channels with high gain and low noise figure.

    Main Methods:

    • Utilized an all-fiberized, cladding-pumped configuration.
    • Employed optimized fiber components, including a passively cooled pump laser diode, pump coupler, and pump stripper.
    • Coupled high-power multimode pump light to the active fiber.

    Main Results:

    • Achieved amplification supporting a record 42 spatial channels.
    • Obtained an average gain of 18 dB.
    • Measured an average noise figure of 5.4 dB and an average differential modal gain of 3.4 dB.
    • Demonstrated effective coupling of pump light without thermal degradation.

    Conclusions:

    • The developed amplifier is highly effective for SDM transmission.
    • The design enables a significant increase in spatial channel count for optical networks.
    • Optimized components ensure robust performance and high power handling.