Plastic optical fibers are made entirely of polymer materials, such as PMMA, polystyrene, or polycarbonates, for both the core and cladding, unlike glass fibers which use silica cores. POFs typically have large core diameters (around 1 mm or more) and high numerical apertures (~0.4), which allows them to guide a large number of light modes, making them inherently multimode fibers . This multimode nature is ideal for coupling light from LEDs, which are commonly used as transmitters in short-distance applications. Most POFs use a step-index profile, where the refractive index of the core is uniform and higher than that of the cladding. This design supports multiple propagation paths (modes) but limits bandwidth due to intermodal dispersion, making POF suitable for short-range data transmission, typically up to tens of meters for high-speed links . Graded-index POFs (GI-POF) have been developed to reduce intermodal dispersion and increase bandwidth, but they remain multimode . The multimode characteristic of POFs also contributes to their mechanical robustness and ease of installation, as the large core relaxes alignment tolerances for connectors and allows simple termination methods. POFs are widely used in automotive networks, home networking, illumination, and short-range communication systems, where their multimode design provides cost-effective and flexible solutions .
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