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

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What is the typical NA range for multimode 50/125um graded index fibers?

0.400

0.500

0.200

The typical numerical aperture (NA) range for multimode 50/125 micron graded index fibers is generally around 0.200 to 0.300. The NA is a crucial parameter in fiber optics as it defines the light-gathering ability of the fiber, influencing the performance in terms of bandwidth and distance.

For 50/125 micron graded index fibers, the NA is often standardized to be around 0.200. This value allows these fibers to effectively transmit multiple light rays through the core at different angles, which is important for multimode applications where multiple pathways of light are utilized simultaneously. While some variations exist in certain fiber types, especially those designed for specific applications, the most common and widely accepted value for multimode 50/125 fibers falls within this range, confirming that 0.200 is indeed typical.

The other options do not align with the standard specifications for this type of fiber.

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0.300

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