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Rayleigh backscattering from the fundamental mode in multimode optical fibers
Applied Optics
|July 14, 2016
Summary
Rayleigh backscattering in multimode optical fibers is analyzed, revealing that only half-azimuthal modes are backscattered. Even-numbered mode groups in quadratic fibers are excited with equal efficiencies.
Area of Science:
- Optics and Photonics
- Fiber Optics
- Wave Propagation
Background:
- Rayleigh backscattering is a phenomenon in optical fibers.
- Understanding mode coupling and excitation is crucial for fiber optic communication.
- Previous analyses often simplified the complexity of multimode fiber interactions.
Purpose of the Study:
- To analyze Rayleigh backscattering in multimode optical fibers.
- To derive explicit formulas for mode excitation efficiency.
- To investigate backscattering characteristics in fibers with quadratic refractive-index profiles.
Main Methods:
- Analysis using a diffraction technique.
- Consideration of the full set of backward-propagating modes.
- Derivation of explicit formulas based on radial mode field distributions.
Main Results:
- Proved that only half-azimuthal modes are backscattered by a fixed polarization incident wave.
- Developed advanced analytical expressions for quadratic refractive-index profile fibers.
- Demonstrated that even-numbered mode groups with equal propagation constants are excited with equal efficiencies.
Conclusions:
- The study provides a comprehensive analysis of Rayleigh backscattering in multimode fibers.
- Identified specific mode characteristics influencing backscattering.
- Offers insights into mode excitation efficiencies in structured optical fibers.
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