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

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What is the core diameter of a single-mode fiber?

Approximately 10 to 12 microns

Approximately 5 to 7 microns

Approximately 8 to 10 microns

The core diameter of a single-mode fiber is approximately 8 to 10 microns. This small core size is essential for single-mode fibers as it allows only one mode of light to propagate through the fiber. This characteristic minimizes modal dispersion, which can degrade the signal quality over longer distances. The precise control over the light mode enables single-mode fibers to be highly efficient for long-distance telecommunications, as it results in lower attenuation and higher bandwidth capabilities compared to multimode fibers. The narrow core facilitates the transmission of light with minimal signal distortion, making single-mode fibers ideal for applications requiring high performance in data transmission.

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Approximately 12 to 14 microns

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