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How do fibre-optic systems convert voice signals into light pulses and back into sound?
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amorphous solid
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Fiber-optic systems facilitate communication by converting information into light signals that travel through glass or plastic fibers. The process involves three primary components:12
- Electro-optical transmitter: This device converts analog or digital voice signals into a modulated beam of light. It typically utilizes a light-emitting diode or a semiconductor laser to generate infrared light pulses that correspond to the input data.213
- Optical fiber: The light pulses propagate through the core of the fiber via total internal reflection, allowing the signal to travel long distances with minimal loss of intensity.1
- Optoelectronic receiver: At the destination, this device detects the incoming light pulses and converts them back into an electric current. This electrical signal is then processed and converted back into sound waves, which can be heard by the user.2
While the fibers themselves are often made of glass—an amorphous solid—the conversion process relies on the precise modulation of light to carry information across these transparent channels.12