PHYSICAL LAYER AND TRANSMISSION MEDIA
INTRODUCTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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In fiber optics, the signal is ____ waves.
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light
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radio
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infrared
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very low frequency
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Explanation:
Detailed explanation-1: -In fibre optics, the signal source is Light waves. The light in a fibre-optic cable flows through the core (hallway) by continually bouncing off the cladding (mirror-lined walls), a concept known as complete internal reflection.
Detailed explanation-2: -Because fiber optics uses light rather than electrical signals to transmit data, fiber-optic cable speed is incredibly fast ― close to the speed of light.
Detailed explanation-3: -The light source is usually called a “fiber optic illuminator” and consists of a bright light source and often some optics to efficiently focus light into the fiber. Sources must be bright, so quartz halogen or xenon metal halide lights are commonly used.
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