Laser modem 1+ Gbit / s to replace WiFi
The State University of Pennsylvania has developed a new technology of wireless laser communications, which provides for the transfer of data at a speed of more than 1 Gbit / s in the gigahertz range.
The signal is emitted by numerous laser diodes (most likely in the infrared spectrum), and photodiodes are used as the receiver. Direct visibility is not required. The signal can be quietly transmitted inside the house, including the adjacent rooms, reflecting from several walls alternately. The main thing is that the walls were not painted black. The signal to the room with the door closed, too, obviously, can not get.
However, according to critics, the technology can not be called practical. Still, the walls block the signal (reflect, but do not let through, as in the case of radio waves). In addition, according to experts, this technology is nothing new, such solutions have existed for a long time (for example, HP NetBeam IR ), and each year they simply add a hundred or so megabytes per second to bandwidth. Moreover, the Infrared Data Association has long advocated the gigabit IrDA protocol.
The only real advantage of laser modems is that they do not create interference. And this is really a problem that can soon declare itself at the top of its voice when WiFi routers are installed in each apartment and begin to really interfere with each other. In this case, the inability of the laser to pass through the walls is the way out.
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In addition, in some buildings (hospitals, research laboratories) the use of WiFi and other radio technologies is strictly prohibited due to concerns about interference with critical equipment. Here, too, laser modems can find their niche.
via slashdot
The signal is emitted by numerous laser diodes (most likely in the infrared spectrum), and photodiodes are used as the receiver. Direct visibility is not required. The signal can be quietly transmitted inside the house, including the adjacent rooms, reflecting from several walls alternately. The main thing is that the walls were not painted black. The signal to the room with the door closed, too, obviously, can not get.
However, according to critics, the technology can not be called practical. Still, the walls block the signal (reflect, but do not let through, as in the case of radio waves). In addition, according to experts, this technology is nothing new, such solutions have existed for a long time (for example, HP NetBeam IR ), and each year they simply add a hundred or so megabytes per second to bandwidth. Moreover, the Infrared Data Association has long advocated the gigabit IrDA protocol.
The only real advantage of laser modems is that they do not create interference. And this is really a problem that can soon declare itself at the top of its voice when WiFi routers are installed in each apartment and begin to really interfere with each other. In this case, the inability of the laser to pass through the walls is the way out.
')
In addition, in some buildings (hospitals, research laboratories) the use of WiFi and other radio technologies is strictly prohibited due to concerns about interference with critical equipment. Here, too, laser modems can find their niche.
via slashdot
Source: https://habr.com/ru/post/83240/
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