What is step-index POF?
Step-index plastic optical fiber (POF) is a type of optical fiber with a core and cladding that have different refractive indices, creating a sharp boundary between them. The core, usually made of polymethyl methacrylate (PMMA) or similar polymers, has a higher refractive index than the cladding. This setup causes light to propagate through the core by reflecting off the core-cladding boundary, which allows the fiber to guide light over short distances.
In step-index POF, light rays travel in a zigzag pattern due to total internal reflection at the boundary. This is different from graded-index fibers, where the refractive index gradually changes from the center to the edge of the core. Step-index POF is simpler in structure and easier to manufacture, making it more cost-effective. However, it typically has higher signal attenuation and limited bandwidth compared to graded-index fibers, which restricts its use to short-distance applications, such as in automotive networks, industrial control, and home networking. The maximum operational temperature ranges from +70°C up to +85°C, depending on the application.
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