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through the air, we're just as likely to get our TV through fiber-optic cables. It was only a matter of time before the world of cable TV took noticeand Kao's "groundbreaking achievement" was properly recognized when he was awarded the 2009 Nobel Prize in Physics. Note that in some countries, including the UK, fiber optics is spelled "fibre optics." If you're looking for information online, it's always worth searching both spellings. Although Colladon is the true grandfather of fiber-optics, Tyndall often earns the credit. It can do this because it is made of a different type of glass to the core.



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It was originally developed for endoscopes in the 1950s to help doctors see inside the human body without having to cut it open first. A good, solid introduction to the physics of light from the popular DK Eyewitness series. In the 1960s, engineers found a way of using the same technology to transmit telephone calls at the speed of light (normally that's 186,000 miles or 300,000 km per second in a vacuum, but slows to about two thirds this speed in a fiber-optic cable). It's one of the things that keeps light inside the pipe. You could hook your computer up to a laser, which would convert electrical information from the computer into a series of light pulses. Apart from offering much higher capacity, optical fibers suffer less from interference, so offer better signal (picture and sound) quality; they need less amplification to boost signals so they travel over long distances; and they're altogether more cost effective. Vast quantities of fiber were laid from the 1980s onward; estimates vary wildly, but the worldwide total is believed to be several hundred million kilometers (enough to cross the United States about a million times). Broadcasting Back in the early 20th century, radio and TV broadcasting was born from a relatively simple idea: it was technically quite easy to shoot electromagnetic waves through the air from a single transmitter (at the broadcasting station) to thousands of antennas on people's homes. How fiber-optics works, photo: Fiber-optic cables are thin enough to bend, taking the light signals inside in curved paths too. Optical Network Design and Implementation by Vivek Alwayn. 1930s: Heinrich Lamm and Walter Gerlach, two German students, tried to use light pipes to make a gastroscopean instrument for looking inside someone's stomach. Uses for fiber optics Shooting light down a pipe seems like a neat scientific party trick, and you might not think there'd be many practical applications for something like that.


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