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In 1973, while prototyping the first laser printers at PARC, Gary Starkweather and others made a duplex 30 Mbit/s CAN optical link using astronomical telescopes and HeNe lasers to send data between offices; they chose the method due partly to less strict regulations (at the time) on free-space optical communication by the FCC.
In 1962, MIT Lincoln Labs built an experimental OWC link using a light-emitting GaAs diode and was able to transmit TV signals over a distance of 30 miles. After the invention of the laser, OWC was envisioned to be the main deployment area for lasers and many trials were conducted using different types of lasers and modulation schemes. [6]
In 2008, the ESA used laser communication technology designed to transmit 1.8 Gbit/s across 40,000 km (25,000 mi), the distance of a LEO-GEO link. Such a terminal was successfully tested during an in-orbit verification using the German radar satellite TerraSAR-X and the American Near Field Infrared Experiment (NFire) satellite.
Virginia-based Attochron plans to use lasers to solve the “last mile” problem, which leaves people and businesses without a fast internet connection.
Laser Interconnect and Networking Communications System (LINCS) is a test of laser communication in space using two cubesats launched in June 2021. Background [ edit ]
A remotely located optical transmitter/receiver system usually consisting of a laser, telescope, and detector provides an optical signal to the modulating retro-reflector. The incident light from the transmitter system is both modulated by the MRR and reflected directly back toward the transmitter (via the retroreflection property).
The capacity of a given link can be expanded simply by upgrading the multiplexers and demultiplexers at each end. This is often done by the use of optical-to-electrical-to-optical (O/E/O) translation at the very edge of the transport network, thus permitting interoperation with existing equipment with optical interfaces.
Deep Space Optical Communications (DSOC) is a laser space communication system in operation that improved communications performance 10 to 100 times over radio frequency technology without incurring increases in mass, volume or power. [1]