Word: photodetector
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...laser on and off, interrupting a light beam being sent into the end of a fiber. The light thus travels in a series of pulses, not unlike Morse code, that race along the glass "wire." At the end of their journey, these light pulses are picked up by a photodetector, which converts them back to electrical pulses. These, in turn, are fed into a decoder for translation into an electrical signal that vibrates a diaphragm in the receiver, reproducing the voice...
...Piet Kramer and their 25-person team, uses a helium-neon laser beam instead of a needle. And instead of grooves, Philips' shiny aluminum disks have millions of microscopic "pits" that produce variations in the intensity of the laser beam's reflection as the disk spins. A photodetector translates the reflection into electrical impulses, which are then fed to the TV screen. The color is truer than that of any image transmitted over the air from a TV station. The disk could also carry stereo sound along with the picture...
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