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A laser-based space communication system developed by researchers at Chalmers University of Technology uses an almost noiseless preamplifier to improve reach and data rates for space communications. The research has implications for technologies such as intersatellite communication, deep-space missions, and Earth monitoring with lidar.
The Chalmers team’s system overcomes losses over large distances in space by significantly increasing the sensitivity of the receiver, while encoding information onto a single wave, which, along with a pump wave at a different frequency, generates a conjugated wave in a nonlinear medium. The waves are launched together into the free space, where they eventually reach the receiver.