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Related Experiment Video

Updated: Dec 31, 2025

Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy
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13.4km OAM state propagation by recirculating fiber loop.

Patrick Gregg, Poul Kristensen, Siddharth Ramachandran

    Optics Express
    |August 25, 2016
    PubMed
    Summary

    Researchers propagated orbital angular momentum (OAM) states over 13.4km in air core fiber, achieving low loss and crosstalk. Doubling effective index separation significantly reduced intermodal crosstalk, paving the way for data center applications.

    Area of Science:

    • Optical communications
    • Fiber optics
    • Photonics

    Background:

    • Orbital angular momentum (OAM) modes offer potential for increased data capacity in optical fibers.
    • Maintaining OAM state integrity over long distances with low crosstalk is crucial for practical applications.

    Purpose of the Study:

    • To demonstrate long-distance propagation of OAM states in air core fiber.
    • To investigate the impact of effective index separation on intermodal crosstalk.
    • To assess the feasibility of OAM modes for data center interconnects.

    Main Methods:

    • Utilized a recirculating fiber loop setup to propagate OAM states over 13.4km.
    • Employed air core fiber with enhanced effective index separation (Δneff = 1.7 × 10-4) and low transmission loss (0.8dB/km).

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  • Analyzed intermodal crosstalk as a function of effective index separation.

    • Main Results:

    • Achieved propagation of OAM states over 13.4km with low transmission loss (0.8dB/km).
    • Observed a rapid decrease in intermodal crosstalk with increasing effective index separation.
    • Demonstrated that doubling Δneff can reduce crosstalk by an order of magnitude.
    • Showcased low loss (≤ 0.2dB) and low crosstalk (-15dB) during fiber splicing.

    Conclusions:

    • Air core fibers with optimized effective index separation exhibit properties suitable for low-crosstalk OAM propagation.
    • Birefringent perturbations are more critical than shape perturbations for OAM modes in these fibers.
    • OAM modes can be preserved with low loss and crosstalk over distances relevant for large-scale data centers.