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16 October 2003 Intermode power transfer in multimode optical fiber with a rough surface
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We present an experimental and theoretical study of light scattering and propagation in multimode optical fibers with rough surfaces. In the experiments, performed at λ=655 nm, we used multimode 200 μm diameter silica glass fibers with an etched rough section. As the guided light reaches the rough part of the fiber it is scattered, feeding other modes and leaking out into the surrounding space. After some distance, however, the leakage decreases and the light within the fiber is carried primarily by the modes with low transverse wavenumbers. The light then propagates with a relatively narrow (half-width of about 0.15 rad) and slowly reducing angular spread. To understand this behavior, we develop a diffusion model for the intermode power transfer. The model predicts the formation of a narrow central maximum with a stable propagating angular profile, and relates parameters of the fiber and the surface roughness to the characterstic decay lengths.
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Elena I. Chaikina, Serguei Stepanov, Tamara A. Leskova, Eugenio R. Mendez, and A. Georgina Navarrete "Intermode power transfer in multimode optical fiber with a rough surface", Proc. SPIE 5189, Surface Scattering and Diffraction III, (16 October 2003);

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