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From Darwin to Internet at the speed of light 
ESA PR 74-2002. Internet traffic jams may become history if ESA succeeds in developing new technology to see nearby Earth-sized planets. Why? In looking for new ways to detect planets ESA is thinking that, instead of bulky mirrors and lenses in space, one can build miniaturised optical systems that fit onto a microchip. Such 'integrated optics' would also allow earthly computer networks to use high-speed routing of data streams as a natural spin-off. Data moving around the Internet are like road traffic in that a car can be driven fast down a straight road but has to slow down a great deal when changing direction at a junction. The same thing happens on information highways. Beams of light carry data along fibre-optic cables at very high speeds. When the data arrive at computers, known as servers, the servers redirect them to their final destinations. Presently, you need to convert the light signals into electricity, and that slows everything down.
Electrons move at a speed of a few kilometres per second through a circuit, whereas light travels at nearly 300 000 kilometres per second. Integrated optics would leave the data as light and simply channel it through the chip, in the right direction. Scientists call this area integrated optics, referring to the integrated circuit board on which chips are mounted. Instead of miniaturised electronics, however, miniaturised optics are placed on a microchip.
When you combine light beams, you traditionally need moving mirrors and lenses to divert the light beams to where you want them. However, if the system moves, it can break. As Malcolm Fridlund, Project Scientist for Darwin and GENIE says, "To change to integrated optics, which is much smaller and has no moving parts, would be highly desirable."
Desirable certainly, but also difficult. At present, integrated optics is a science that is far behind integrated circuit technology. For this reason, ESA is funding two studies. Astrium has been asked to study a traditional optics approach and Alcatel is investigating an integrated-optics solution. "We shall take the decision on whether GENIE will use integrated optics in just over one year," says Fridlund.
Should the integrated-optics approach work, the rewards would extend far beyond a few improvements in searching for planets. Here on Earth, for all home-computer users, for example, it could speed up the Internet by 100–1000 times. The consequences of surfing the Web at such speeds would be amazing.
Note to editors Darwin Darwin is a flotilla of eight spacecraft that will find Earth-like planets and analyse their atmospheres for the chemical signature of life. Six spacecraft will fly telescopes. The seventh will combine the light from these to simulate a mirror much larger than that of a single telescope. The eighth will communicate with Earth and the flotilla. The mission is being studied at present and is expected to launch some time after 2014. Genie
GENIE (Ground-based European Nulling Interferometer Experiment) is an ESA/ESO instrument to perform nulling interferometry using ESO's Very Large Telescope (VLT), a collection of four 8-metre telescopes in Chile. Once up and running, GENIE will provide a training ground for astronomers who will later use Darwin. One of GENIE’s major tasks will be to develop the target list of stars for Darwin to study. GENIE will see failed stars, known as brown dwarfs and, if the instrument performs to expectations, may also see some of the already-discovered giant planets. So far, these worlds have never been seen, only inferred to exist by the effects they have on their parent stars. GENIE is expected to be on-line by 2006.
For more information please contact:
ESA Communication Department
Malcolm Fridlund, ESA Darwin & GENIE Project Scientist
Anders Karlsson, ESA Darwin Project Manager
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