From sjnoll at ix.netcom.com Fri Jan 1 12:29:47 2021 From: sjnoll at ix.netcom.com (Steve J. Noll) Date: Fri, 1 Jan 2021 09:29:47 -0800 Subject: [Laser] Paper about "Free-space optical links for space communication networks" In-Reply-To: References: Message-ID: Thanks for the link, Paolo! Happy to see that there is still some interest here. I?m just getting back into it after 30 years. Made my first 2-ways in 1979. Just finished a pair of HackRF One microwave transceivers for 2,3, and 6 GHz and now starting on a pair of optical transceivers. LEDs this time, not lasers, Vishay VLCS5830 65,000 mcd 624nm 8-degree and VSLY5850 55 mW 6-degree BW at 850 nm. Planning to erect a multi-wavelength IR laser beacon for receiver testing. 73, Steve WA6EJO On 12/31/2020 7:27 AM, Paolo Cravero wrote: > Gentlefolks, > the list has been silent for a while, so it is time to check if it is still > working. > > Recently I spotted this 66 pages long document about "Free-space optical > links for space communication networks" (PDF at > https://arxiv.org/abs/2012.13166). It talks about past, present and future > of optical communication links. A bit of theory, a bit of math and easy > graphs, some pictures of real-world applications. I think the booklet is > also good for the technically inclined newcomers to FSO experiments. > > The website linked above ( https://arxiv.org/ ) has a good collection of > fresh technical papers on many subjects, probably too specific for most > hobbyists, but that's a good diversion from browsing e-commerce portals :) > > Have a nice read, > Paolo - Italy > > PS. The abstract for your convenience: > "Future spacecraft will require a paradigm shift in the way the information > is transmitted due to the continuous increase in the amount of data > requiring space links. Current radiofrequency-based communication systems > impose a bottleneck in the volume of data that can be transmitted back to > Earth due to technological as well as regulatory reasons. Free-space > optical communication has finallyemerged as a key technology for solving > the increasing bandwidth limitations for space communication while reducing > the size, weight and power of satellite communication systems, and taking > advantage of a license-free spectrum. In the last few years, many missions > have demonstrated in orbit the fundamental principles of this technology > proving to be ready for operational deployment, and we are now witnessing > the emergence of an increasing number of projects oriented to exploit space > lasercommunication (lasercom) in scientific and commercial applications. > This chapter describes the basic principles and current trends of this new > technology." > ______________________________________________________________ > Laser mailing list > Home: http://mailman.qth.net/mailman/listinfo/laser > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Laser at mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html