A research team at the University of California at Santa Barbara (UCSB) has for the first time incorporated on a single chip both a widely tunable laser and an all-optical wavelength converter, thereby creating an integrated photonic circuit for transcribing data from one color of light to another. Such a device is key to realizing an all-optical network. This research is being funded by a Defense Advanced Research Project Agency (DARPA) Microsystems Technology Office (MTO) grant to push the boundary for photonic-circuit functional integration.
Think about data transmission over the Internet in terms of a telephone call between Los Angeles and New York. What enables two people to talk is the "dedicated" line between them. On the Internet the long-distance transport of information between the two cities is via optical fibers or light pipes, which can move numerous colors of light over a single fiber at the same time with each color representing a "dedicated" line for the transmission of data (i.e., wavelength division multiplexing [WDM]).
Data moves between coasts through nodes of the Internet located in cities like Phoenix or Houston, where the capability is needed to switch information arriving on one fiber as orange photons to continue the next leg of their journey on another fiber as red photons because the channel for orange on that fiber is in use. Today, this switching from one color to another has to be done by converting photons to electrons, switching electronically, and converting electrons back to photons.
Jacquelyn Savani | EurekAlert!
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A new manufacturing technique uses a process similar to newspaper printing to form smoother and more flexible metals for making ultrafast electronic devices.
The low-cost process, developed by Purdue University researchers, combines tools already used in industry for manufacturing metals on a large scale, but uses...
For the first time ever, scientists have determined the cosmic origin of highest-energy neutrinos. A research group led by IceCube scientist Elisa Resconi, spokesperson of the Collaborative Research Center SFB1258 at the Technical University of Munich (TUM), provides an important piece of evidence that the particles detected by the IceCube neutrino telescope at the South Pole originate from a galaxy four billion light-years away from Earth.
To rule out other origins with certainty, the team led by neutrino physicist Elisa Resconi from the Technical University of Munich and multi-wavelength...
For the first time a team of researchers have discovered two different phases of magnetic skyrmions in a single material. Physicists of the Technical Universities of Munich and Dresden and the University of Cologne can now better study and understand the properties of these magnetic structures, which are important for both basic research and applications.
Whirlpools are an everyday experience in a bath tub: When the water is drained a circular vortex is formed. Typically, such whirls are rather stable. Similar...
Physicists working with Roland Wester at the University of Innsbruck have investigated if and how chemical reactions can be influenced by targeted vibrational excitation of the reactants. They were able to demonstrate that excitation with a laser beam does not affect the efficiency of a chemical exchange reaction and that the excited molecular group acts only as a spectator in the reaction.
A frequently used reaction in organic chemistry is nucleophilic substitution. It plays, for example, an important role in in the synthesis of new chemical...
Optical spectroscopy allows investigating the energy structure and dynamic properties of complex quantum systems. Researchers from the University of Würzburg present two new approaches of coherent two-dimensional spectroscopy.
"Put an excitation into the system and observe how it evolves." According to physicist Professor Tobias Brixner, this is the credo of optical spectroscopy....
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