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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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Low-complexity turbulence resilience enabled by a multi-mode bi-directional transceiver.

Ultan J Daly, Fortune Iga, Aleksandr Boldin

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    This summary is machine-generated.

    OM5 graded index fiber offers a robust solution for free-space optical (FSO) communications, enabling high-speed, error-free data transmission without adaptive optics, even in turbulent conditions.

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    Area of Science:

    • Optical Communications
    • Fiber Optics
    • Wireless Optics

    Background:

    • Free-space optical (FSO) systems face challenges from mechanical instability and atmospheric turbulence, causing distortions and high losses.
    • Adaptive optics are typically required for bi-directional single-mode FSO systems to mitigate these distortions.
    • Existing systems struggle with pointing accuracy and environmental factors impacting signal integrity.

    Purpose of the Study:

    • To investigate and compare the performance of step-index and graded-index multi-mode fibers for bi-directional FSO communications.
    • To evaluate the suitability of OM5 graded index fiber for FSO applications, focusing on its mode properties and field of view.
    • To demonstrate high-throughput, error-free FSO communication without adaptive optics.

    Main Methods:

    • Emulation of a 400m FSO channel with varying turbulence levels (D/r0 = 3 and D/r0 = 9).
    • Comparison of step-index and graded-index multi-mode fibers, specifically OM5 fiber.
    • Utilized commercial bi-directional small form-factor pluggable (SFP+) transceivers.

    Main Results:

    • OM5 graded index fiber demonstrated a near-Gaussian optical transmission mode and a >5x increase in field of view compared to single-mode fiber.
    • Error-free throughput of 10 Gbps was achieved under low turbulence (D/r0 = 3).
    • An error-free throughput of 9.1 Gbps was achieved under high turbulence (D/r0 = 9).

    Conclusions:

    • OM5 graded index fiber is a viable solution for bi-directional FSO communication, overcoming limitations of single-mode systems.
    • The use of OM5 fiber enables high-speed (10 Gbps) FSO links without the need for complex adaptive optics.
    • This approach significantly enhances the robustness and deployability of FSO communication systems in challenging environments.