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January 22, 2019 02:05 pm

Facebook Appears To Be Quietly Building Laser Satellites For Global Communications

The snow-dusted peak of Mount Wilson in California has been home to many famous observatories. Until 1949, its 100-inch (2.5-meter) Hooker telescope was the largest aperture telescope in the world, and in 2004, its CHARA array became the world's largest optical interferometer. Now, two new observatories are being built there that, while not focused on the stars, might prove equally historic. They could house Facebook's first laser communications systems designed to connect to satellites in orbit. IEEE Spectrum reports: Construction permits issued by the County of Los Angeles show that a small company called PointView Tech is building two detached observatories on the mountain peak. PointView is the company that IEEE Spectrum revealed last year to be a previously unknown subsidiary of Facebook working on an experimental satellite called Athena. In April, PointView sought permission from the U.S. Federal Communications Commission to test whether E-band radio signals could "be used for the provision of fixed and mobile broadband access in unserved and underserved areas." That application was still pending at the FCC before the current U.S. federal government shutdown took effect, but it and other public documents and presentations now strongly suggest that PointView is planning to utilize laser technology, possibly both in Athena and future spacecraft. Facebook has long been interested in free space optical, or laser, communication technology. Lasers are able to support much higher data rates than radio transmitters for a given input power, and their signals are largely immune to interference or hacking, although clouds can be problematic. Although Facebook developed millimeter-wave E-band links for its stratospheric Aquila drones, it was also experimenting with air-to-ground laser communications before it canceled its drone program last June. The laser tests, which used technology supplied by German company Mynaric, succeeded in establishing 10-gigabit-per-second links between a ground station and a light aircraft flying overhead.

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