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How do fibre-optic communication systems transmit information using light pulses?
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Fibre-optic communication systems transmit information by converting data into modulated light pulses that travel through thin, transparent strands of glass or plastic. The process relies on three primary components:12
- Electro-optical transmitter: This device converts analog or digital information into a modulated beam of light, typically using light-emitting diodes or [semiconductor lasers].12
- Optical fibre: The light travels through a central core surrounded by a cladding layer with a lower [index of refraction]. Through total internal reflection, light rays are constrained within the core, allowing them to propagate over long distances with minimal loss of intensity.342
- Optoelectronic receiver: At the destination, this device detects the light pulses and converts them back into an electric current.1
To maintain signal integrity over very long distances, systems may use optical amplifiers to boost the light signals. By using light rather than electrical current, these systems achieve high bandwidth, immunity to electromagnetic interference, and the ability to transmit vast amounts of data at high speeds.13