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Design of a side-hole-assisted weakly coupled rectangular ring-core multimode fiber for mode-division-multiplexing
Applied Optics
|October 6, 2021
Summary
This study introduces a novel rectangular ring-core fiber that supports 68 eigenmodes for enhanced optical communication. The design effectively separates these modes, paving the way for higher transmission capacity in eigenmode-division multiplexing networks.
Area of Science:
- Optical Fiber Communications
- Photonics
- Waveguide Engineering
Background:
- Multimode fibers (MMFs) offer higher bandwidth potential but suffer from modal dispersion.
- Eigenmode-division multiplexing (EDM) aims to utilize multiple spatial modes for increased data rates.
- Effective techniques are needed to control and separate eigenmodes in MMFs.
Purpose of the Study:
- To design and analyze a polarization-maintaining rectangular ring-core MMF.
- To investigate the feasibility of supporting a large number of eigenmodes with effective separation.
- To evaluate the fiber's performance for EDM applications.
Main Methods:
- Utilized a side-hole-assisted rectangular ring-core structure.
- Analyzed eigenmode splitting and mode utilization rate (η).
- Evaluated parameters including effective refractive index (n_eff), refractive index difference (Δn_eff), effective area (A_eff), nonlinearity, differential mode delay (DMD), and bending loss across the C-band.
Main Results:
- Successfully designed a fiber supporting 68 eigenmodes.
- Achieved complete separation of all 68 eigenmodes with Δn_eff > 10⁻⁴ across the C-band.
- Demonstrated low bending loss and broadband performance.
Conclusions:
- The proposed fiber design enables effective eigenmode separation for MMFs.
- This technology can significantly enhance transmission capacity and spectral efficiency in future optical networks.
- The fiber is suitable for advanced eigenmode-division multiplexing systems.
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