What is the outer concentric glass layer that surrounds the optical fiber core called?

Prepare for the BICSI Installer 1 Exam. Study with flashcards and multiple-choice questions, each with hints and explanations. Get ready for your exam!

The outer concentric glass layer that surrounds the optical fiber core is referred to as cladding. This layer plays a crucial role in the functioning of optical fibers by reflecting light back into the core, which enables the transmission of light signals over long distances without significant loss of signal strength.

Cladding is designed with a lower refractive index than the core, creating a condition called total internal reflection. This property is essential for guiding light within the core of the fiber, thus ensuring that the signal remains within the core and travels along the length of the fiber effectively.

Without cladding, the light could escape from the core, leading to signal degradation and loss, which would undermine the overall performance of the fiber optic system. Therefore, cladding is not just a protective layer; it is integral to the function and efficiency of optical communication systems.

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