Rayleigh backscattering from the fundamental mode in multimode optical fibers
Rayleigh backscattering produced by an incident fundamental mode in a multimode optical fiber is analyzed using a diffraction technique, with a full set of backward-propagating modes being taken into consideration. Explicit formulas are derived for mode excitation efficiency via radial distributions...
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Veröffentlicht in: | Applied Optics 2016-07, Vol.55 (19), p.5041-5051 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Rayleigh backscattering produced by an incident fundamental mode in a multimode optical fiber is analyzed using a diffraction technique, with a full set of backward-propagating modes being taken into consideration. Explicit formulas are derived for mode excitation efficiency via radial distributions of the mode fields, and it is proved that only half-azimuthal modes are backscattered by the incident wave of a fixed polarization. Advanced analytical expressions are developed for fibers with a quadratic refractive-index profile, and mode groups of even numbers, composed of modes with equal propagation constants, are stated to be excited with equal efficiencies. |
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ISSN: | 0003-6935 1559-128X 2155-3165 1539-4522 |
DOI: | 10.1364/AO.55.005041 |