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Updated: Oct 17, 2025

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Published on: February 28, 2016
Non-zero dispersion-shifted ring fiber for the orbital angular momentum mode
Researchers designed a novel ring fiber to increase optical data capacity. This fiber supports orbital angular momentum (OAM) modes with low dispersion, enhancing wavelength division multiplexing (WDM) systems.
Area of Science:
- Optical Communications
- Photonics
- Materials Science
Background:
- Orbital angular momentum (OAM) offers a new dimension for increasing data capacity in wavelength division multiplexing (WDM) systems.
- Non-zero dispersion-shifted fibers (NZDSF) are crucial for OAM-based WDM, but suitable designs for OAM modes are lacking.
Purpose of the Study:
- To propose and design a novel ring fiber capable of supporting OAM modes with low chromatic dispersion.
- To investigate the fiber's performance characteristics for potential use as an NZDSF in optical communication systems.
Main Methods:
- Simulated a ring fiber structure for the HE2,1 mode to act as an NZDSF for the OAM1,1 mode.
- Analyzed chromatic dispersion, dispersion variation, and effective area within the C-band.
- Evaluated the fiber's tolerance to perturbations like ellipticity and bending.
Main Results:
- Achieved a low dispersion of 3.3 ps/(nm·km) at 1550 nm for the OAM1,1 mode.
- Demonstrated dispersion variation <2.9 ps/(nm·km) across the 1530-1565 nm range, meeting ITU-T G.655.C standards.
- Obtained a large effective area of approximately 646 µm² and confirmed support for OAM1,1 mode within the C-band.
Conclusions:
- The proposed ring fiber design effectively functions as an NZDSF for OAM1,1 modes with low dispersion.
- The fiber exhibits enhanced tolerance to perturbations, making it suitable for practical optical communication systems.
- This novel fiber is a promising candidate for advancing OAM-based WDM systems by reducing dispersion and nonlinear effects.
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