From paolo.cravero at gmail.com Thu Dec 31 10:27:29 2020 From: paolo.cravero at gmail.com (Paolo Cravero) Date: Thu, 31 Dec 2020 16:27:29 +0100 Subject: [Laser] Paper about "Free-space optical links for space communication networks" Message-ID: 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." From glennt at gbis.com Thu Dec 31 11:53:20 2020 From: glennt at gbis.com (Glenn Thomas) Date: Thu, 31 Dec 2020 08:53:20 -0800 Subject: [Laser] Paper about "Free-space optical links for space communication networks" In-Reply-To: References: Message-ID: <58c5169a-8c24-920b-041b-a6a7ae4774db@gbis.com> Paolo - Thanks for the link. Interesting stuff. AFAICT, the last message here was 2Jan19, nearly two years ago! 73 de Glenn wb6w 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 > -- Here is Schrodinger's Epistemic Virus. We don't know that we have it because we can't be tested. We don't want to spread it, so we act as if we have it. We don't want to catch it, because we have no justification to believe we're immune. Thus, we have the virus ...and at the same time don't have the virus ...and also reserve judgement on the matter. Hence Schrodinger's Epistemic Virus. From john at generalrobots.com Thu Dec 31 11:53:44 2020 From: john at generalrobots.com (John McNulty) Date: Thu, 31 Dec 2020 16:53:44 +0000 Subject: [Laser] Paper about "Free-space optical links for space communication networks" In-Reply-To: References: Message-ID: Grazie Mille Paolo. ;-) Good article. Hope that the New Year will be better... J McN On 31 Dec 2020, at 15:28, 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 From wchast at gmail.com Thu Dec 31 12:13:27 2020 From: wchast at gmail.com (Chuck Hast) Date: Thu, 31 Dec 2020 11:13:27 -0600 Subject: [Laser] Paper about "Free-space optical links for space communication networks" In-Reply-To: References: Message-ID: Paolo, Thank you for waking it up. And thank you for the document. Need to get some FSO going back on here again. I think that there is a lot to do out there. I am wanting to get back on some FSO stuff that I had stopped working on. On Thu, Dec 31, 2020 at 10:54 AM John McNulty wrote: > Grazie Mille Paolo. ;-) > > Good article. > Hope that the New Year will be better... > J McN > > > On 31 Dec 2020, at 15:28, 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 > ______________________________________________________________ > 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 -- Chuck Hast -- KP4DJT -- I can do all things through Christ which strengtheneth me. Ph 4:13 KJV Todo lo puedo en Cristo que me fortalece. Fil 4:13 RVR1960 From bernies at panix.com Thu Dec 31 12:46:04 2020 From: bernies at panix.com (bernieS) Date: Thu, 31 Dec 2020 12:46:04 -0500 Subject: [Laser] Paper about "Free-space optical links for space communication networks" In-Reply-To: References: Message-ID: 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 From bernies at panix.com Thu Dec 31 14:28:02 2020 From: bernies at panix.com (bernieS) Date: Thu, 31 Dec 2020 14:28:02 -0500 Subject: [Laser] Paper about "Free-space optical links for space communication networks" In-Reply-To: <20201231174622.CF9B2149A9A3@mail.qsl.net> References: <20201231174622.CF9B2149A9A3@mail.qsl.net> Message-ID: 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." >>______________________________________________________________ >>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 >______________________________________________________________ >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 From wb5pjb at gmail.com Thu Dec 31 17:36:18 2020 From: wb5pjb at gmail.com (Gary Sutton) Date: Thu, 31 Dec 2020 15:36:18 -0700 Subject: [Laser] Paper about "Free-space optical links for space communication networks" In-Reply-To: References: Message-ID: Paolo, thank you for the link to the interesting paper. It does make one want to get out and experiment with FSO again. We may not have satellites at our disposal, but there is much that can be done terrestrially. 73, Gary, WB5PJB On Thu, Dec 31, 2020 at 8:28 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 >