Certified Fiber Optics Practice Exam 2026 – All-in-One Guide to Mastering Your Certification!

Question: 1 / 400

In fiber optics, what does "core" refer to?

The outer layer that protects the fiber

The central part of the fiber where light travels

The term "core" in fiber optics specifically refers to the central part of the fiber where light travels. This is a crucial aspect of fiber optic technology, as the core is made from glass or plastic with a higher refractive index compared to the surrounding cladding. This difference allows light to be guided through the core via total internal reflection, enabling efficient transmission of data over long distances. The diameter of the core can vary between different types of fibers, such as single-mode and multi-mode fibers, impacting the performance and application of the fiber optic system. Given that the core is essential for the propagation of light signals, it plays a significant role in determining the overall capabilities and efficiency of the fiber optic installation.

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The signal processing unit

The coating around the fiber for insulation

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