NCCER 33108 Limited-Energy Cabling Practice Test

The core of optical fiber carries the modulated light signals.

Buffer Cladding Outer jacket Core

Correct Answer:

Core

Explanation:

The essential idea is that light signals are guided through the inner region of the fiber called the core. The core is made of glass with a higher refractive index, which keeps the light trapped inside by total internal reflection at the boundary with the surrounding cladding (which has a lower refractive index). This arrangement lets the modulated light travel long distances with minimal loss, carrying the data. The surrounding cladding simply provides the boundary that keeps the light in; the buffer coating and outer jacket are protective layers that shield the fiber from damage and environmental factors. So, it’s the core that actually carries the modulated light signals.

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