Three Americans who created the technology behind digital photography and helped link the world through fiber-optic networks shared the 2009 Nobel Prize in physics Tuesday.

Charles K. Kao, 75, was cited for discovering how to transmit light signals over long distances through glass fibers as thin as a human hair. His 1966 breakthrough led to the creation of modern fiber-optic communication networks that carry voice, video and high-speed Internet data around the world.

"What the wheel did for transport, the optical fiber did for telecommunications," said Richard Epworth, who worked with Kao at Standard Telecommunications Laboratories in Harlow, England in the 1960s. "Optical fiber enables you to transmit information with little energy over long distances and to transmit information at very high rates."

Willard S. Boyle, 85, and George E. Smith, 79, were honored for inventing the eye of the digital camera, a sensor able to transform light into a large number of pixels, the tiny points of color that are the building blocks of every digital image.

Their charged-coupled device, or CCD, is found today in devices ranging from the cheapest point-and-shoot digital camera to robotic medical instruments equipped with video cameras that let surgeons perform delicate operations deep inside the human body. It also revolutionized astronomy by letting satellites equipped with digital cameras take images from previously unseen regions of outer space and transmit them back to earth.

The work of the three men is "something that has really changed our lives," said Joseph Nordgren, chair of the academy's physics committee. "The impact on science is enormous."

The Royal Swedish Academy of Sciences said all three have American citizenship. Boyle is also Canadian. Kao was born in Shanghai and is also a British citizen.

Phil Schewe, a physicist and spokesman for the American Institute of Physics, called Kao's work "the backbone of our telecommunications world" because of optical fibers' ability to transmit a lot of information through a tiny space at the speed of light.

Boyle and Smith's 1969 discovery at Bell Laboratories in Murray Hill, New Jersey "revolutionized photography, as light could now be captured electronically instead of on film," the Academy said. It described the technology as having built on Albert Einstein's discovery of the photoelectric effect, for which he was awarded the Nobel physics prize in 1921.

Boyle, in a phone call to the academy, said he is reminded of his work with Smith "when I go around these days and see everybody using our little digital cameras, everywhere."

But he said the biggest achievement resulting from his work was the transmission of images of features of Mars like its red desert taken by digital cameras in space.

"We saw for the first time the surface of Mars," Boyle said. "It wouldn't have been possible without our invention."

Borje Johansson, a member of the Nobel Committee for Physics, said the three men's work was evident in numerous, and often overlooked, ways.

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