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

[bernieS]

I forgot to note that I didn't see the optical 
power rating, type of detector, data transmission 
rate, or bit error rate for this LEO-to-ground connection in the paper.

-bernieS


At 12:46 PM 12/31/2020, bernieS wrote:
>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."
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