[Laser] Paper about "Free-space optical links for space communication networks"

[bernieS]

Grazie Paolo!   Interesting article.  I wish 
everyone a happier New Year than 2020 has been.

One interesting part of the paper says, "Table 
8.1 and Fig. 8.13 show an example of a basic 
link-budget calculation for the LEO-to-ground 
SOTA mission carried out by NICT (Japan) [11]. 
The conditions of this link budget are as 
follows: the telescope’s elevation is 30° for a 
link distance of 1,107 km between the ~600-km 
SOTA orbit and the NICT’s OGS in Koganei (Tokyo, 
Japan) during the pass on December 9 th , 2015; 
the operating wavelength is 1549 nm"   (in the near-infared spectrum)

-bernieS


At 10:27 AM 12/31/2020, 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