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Fiber-reinforced concrete significantly enhances the structural and nonstructural properties of traditional concrete by incorporating fibers like steel, glass, and polymers. These fibers, varying from natural ones such as sisal and cellulose to manufactured ones like polypropylene and Kevlar, are mixed into hydraulic cement with aggregates. Steel fibers, often preferred for their robustness, contribute to improved ductility, toughness, and post-cracking performance. The concrete is classified...
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Related Experiment Video

Updated: Jun 21, 2026

Writing Bragg Gratings in Multicore Fibers
08:48

Writing Bragg Gratings in Multicore Fibers

Published on: April 20, 2016

Large-core, broadband optical fiber.

J Sakai, T Kimura

    Optics Letters
    |August 15, 2009
    PubMed
    Summary

    A new broadband optical fiber design allows for a larger core diameter, enhancing performance. This innovation in fiber optics offers improved bandwidth and reduced bending loss for advanced communication systems.

    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Conventional single-mode optical fibers have limitations in core diameter.
    • Broadband optical fiber technology is crucial for high-capacity data transmission.

    Purpose of the Study:

    • To propose a novel broadband optical fiber design with an enlarged core diameter.
    • To investigate the feasibility and performance characteristics of this new fiber design.

    Main Methods:

    • Utilizing a normalized frequency (v) of 4.6 and a core profile parameter (alpha) of 4.5.
    • Analyzing the attainable core diameter and relative index difference (Delta) at a specific wavelength (1.25 microm).

    Main Results:

    • Achieved a core diameter as large as 16.3 microm with a relative index difference (Delta) of 0.3%.

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    Published on: January 7, 2019

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    Last Updated: Jun 21, 2026

    Writing Bragg Gratings in Multicore Fibers
    08:48

    Writing Bragg Gratings in Multicore Fibers

    Published on: April 20, 2016

    A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
    09:03

    A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response

    Published on: January 7, 2019

  • Demonstrated the potential for broadband performance in the proposed fiber structure.

    • Conclusions:

    • The proposed broadband optical fiber design with a larger core diameter is feasible.
    • Further discussion covers fabrication tolerances, bandwidth, and bending loss implications for practical applications.