Certified Fiber Optics Practice Exam 2025 – All-in-One Guide to Mastering Your Certification!

The core diameter of a multi-mode fiber is typically 50 or 62.5 microns. Multi-mode fiber is designed to carry multiple light modes or rays simultaneously, which allows for higher bandwidth over shorter distances compared to single-mode fiber.

The common core diameters, specifically 50 and 62.5 microns, facilitate the efficient transmission of data by allowing light to bounce off the walls of the core and travel through the fiber, which is essential for applications such as data centers and local area networks. These sizes strike a balance between minimizing modal dispersion and enabling sufficient bandwidth for multi-mode applications.

Other options, such as the 10 or 12 microns mentioned, are characteristic of single-mode fibers, which have much smaller core diameters designed for long-distance communication with a single light path to reduce signal loss. The 100-micron core diameter is not typical for multi-mode fibers in commercial use; while it exists, it is not standard and is not widely adopted in practice.