This reflective surface in Optical Fiber Cable prevents the light signals from escaping the core.

This reflective surface in Optical Fiber Cable prevents the light signals from escaping the core.

• A. Jacket
• B. Cladding
• C. Core
• D. Buffer layer

Answer: (B)

Light is kept in the fiber by total internal reflection at the boundary between the core and the surrounding cladding. The core has a higher refractive index than the cladding, so light rays that hit that interface at sufficiently shallow angles are reflected back into the core rather than refracting into the cladding. This reflective boundary guides the light along the length of the fiber, keeping the signal confined to the core. The jacket and buffer layer are protective layers and do not contribute to guiding the light.

Light is kept in the fiber by total internal reflection at the boundary between the core and the surrounding cladding. The core has a higher refractive index than the cladding, so light rays that hit that interface at sufficiently shallow angles are reflected back into the core rather than refracting into the cladding. This reflective boundary guides the light along the length of the fiber, keeping the signal confined to the core. The jacket and buffer layer are protective layers and do not contribute to guiding the light.