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Laser communication can provide broadband connection speeds 4800 times the moon
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Composed of a Massachusetts Massachusetts Institute of Technology Lincoln Laboratory researchers research group first verified by a technology can provide used by mankind in the earth's network connection for the space of residents. It can provide the bulk data transfer even HD video data stream.
Through the professional laser communication equipment, the research group has been to get data from the Earth Moon transfer to test. The research group will be to 13 day in June 8th, announced new details held in San Jose, California Prefecture in 2014 Conference on lasers and Electro Optics, and between the moon and the earth record laser uplink communication "on orbit performance" of the first comprehensive overview. This record is 4800 times higher than the previous transmission speed.
An earlier report elaborated on the results of this research group completed, but did not provide details of it. The Massachusetts Institute of Technology Lincoln Laboratory of Mark - Stevens said: "this is our first published an overview of research results is and how it works. The on orbit performance is very superior, very close to our expected results, which makes us believe that we on the basis of a good understanding of physics."
In 2013, the lunar laser communication Demonstration of this research group (LLCD) to 622 megabits download speed in the transmission of data between the moon and the earth is more than 239000 miles (about 385000 km). The transmission speed than any radio frequency (RF) system. In addition, they also with the transmission speed of 19.44 megabits of data transfer in between the earth and the moon. This rate is 4800 times higher than the hitherto best uplink radio frequency.
Stevens said: "through the laser beam with high data rate to transmit data from the earth to the moon is a challenge, because the distance required to spread the beam of up to 400000 kilometers. The beam through the atmosphere, difficulty is more, because of the turbulence may make the receiver signal fast fading or halfway loss. We demonstrate the change of medium size cloud attenuation of tolerance and the atmospheric turbulence induced large signal power. Results show that, even with the signal margin a few, will also provide performance without error."
Although directly related to lunar laser communication Demonstration and near earth missions, but this research group predicted it may also suitable for deep space missions, the Mars and the outer planet missions.
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