What material is typically used in the construction of optical fibers?

• A. Metal
• B. Glass or plastic
• C. Wood
• D. Paper

Answer: (B)

The use of glass or plastic in the construction of optical fibers is essential because these materials possess the properties necessary for efficient light transmission. Optical fibers work on the principle of total internal reflection, which requires a core that can guide light effectively. Glass, particularly silica, and certain types of plastics are chosen for their ability to transmit light with minimal loss. They have low absorption and scattering rates, which enhances the clarity and distance the light can travel through the fiber.

Glass is commonly used in applications requiring high performance and bandwidth, as it can transmit light over long distances with great efficiency. Plastic optical fibers, although generally used for shorter distances and lower performance applications, still capitalize on the same principles of light transmission. By utilizing these materials, optical fibers are able to carry data as light signals over significant distances, underpinning modern telecommunications and networking technologies.