PathFinder Digital https://www.pathfinderdigital.com Satellite Communications Tue, 20 Apr 2021 19:50:45 +0000 en-US hourly 1 https://wordpress.org/?v=5.7.1 https://pathfinderdigital.s3.amazonaws.com/wp-content/uploads/20200110112941/PFD_icon.png PathFinder Digital https://www.pathfinderdigital.com 32 32 OLSG https://www.pathfinderdigital.com/olsg?utm_source=rss&utm_medium=rss&utm_campaign=olsg https://www.pathfinderdigital.com/olsg#respond Tue, 20 Apr 2021 19:50:45 +0000 https://www.pathfinderdigital.com/?p=1192 The Optical Link Study Group (OLSG) was formed by the Interagency Operations Advisory Group (IOAG) in November 2010.  The purpose of the OLSG was to determine if a business case existed for cross support of optical communication links.  If the case existed then the OLSG was also tasked with providing guidance for standardization. The OLSG presented its final report…

The post OLSG appeared first on PathFinder Digital.

]]>
https://www.pathfinderdigital.com/olsg/feed 0
High-Speed Train System https://www.pathfinderdigital.com/high-speed-train-system?utm_source=rss&utm_medium=rss&utm_campaign=high-speed-train-system https://www.pathfinderdigital.com/high-speed-train-system#respond Mon, 05 Apr 2021 20:59:14 +0000 https://www.pathfinderdigital.com/?p=1188 Overview Trains that have wireless communication capabilities, either for on-board customer use or transport communication services, typically operate in RF bands. With the emergence of FSO technologies, researchers modeled and simulated various broadband FSO wireless communication systems to replace the current RF bands. Most models are designed for both above-ground and underground applications. The base…

The post High-Speed Train System appeared first on PathFinder Digital.

]]>
https://www.pathfinderdigital.com/high-speed-train-system/feed 0
Quantum Experiments at Space Scale (QUESS) https://www.pathfinderdigital.com/quantum-experiments-at-space-scale-quess?utm_source=rss&utm_medium=rss&utm_campaign=quantum-experiments-at-space-scale-quess https://www.pathfinderdigital.com/quantum-experiments-at-space-scale-quess#respond Tue, 23 Mar 2021 16:46:45 +0000 https://www.pathfinderdigital.com/?p=1183 Overview Quantum Experiments at Space Scale (QUESS) is an international project which aims to establish a quantum-encrypted European-Asian network by 2020, and a global network by 2030. These experiments are conducted using Micius also known as the Quantum Science Satellite (QSS). Researchers believe the latest experiments conducted using Micius are bringing them closer towards constructing…

The post Quantum Experiments at Space Scale (QUESS) appeared first on PathFinder Digital.

]]>
https://www.pathfinderdigital.com/quantum-experiments-at-space-scale-quess/feed 0
Saturation Flux Density (SFD) https://www.pathfinderdigital.com/saturation-flux-density-sfd?utm_source=rss&utm_medium=rss&utm_campaign=saturation-flux-density-sfd https://www.pathfinderdigital.com/saturation-flux-density-sfd#respond Tue, 23 Mar 2021 15:46:43 +0000 https://www.pathfinderdigital.com/?p=1180 Overview Saturation flux density (SFD) is a measure of how much power a signal must have to saturate a detector. Flux density is a solid angle measurement in optics, but the typical measurement is made per unit area since detectors do not respond to volumetric intensity outside of time-averaged situations. Some transponders have reduced SFD…

The post Saturation Flux Density (SFD) appeared first on PathFinder Digital.

]]>
https://www.pathfinderdigital.com/saturation-flux-density-sfd/feed 0
FSO Underwater https://www.pathfinderdigital.com/fso-underwater-2?utm_source=rss&utm_medium=rss&utm_campaign=fso-underwater-2 https://www.pathfinderdigital.com/fso-underwater-2#respond Mon, 22 Mar 2021 23:22:46 +0000 https://www.pathfinderdigital.com/?p=1178 Overview Free-space optical communications are typically performed in free space, such as air and vacuum, due to the high transmissivity of both mediums in the telecom waveband (1510 to 1600 nm). However, FSO communication can also be performed in non-ideal mediums like water. Categorizing underwater FSO communication as “free-space communication” is possible since no physical…

The post FSO Underwater appeared first on PathFinder Digital.

]]>
https://www.pathfinderdigital.com/fso-underwater-2/feed 0
Alleviation of Jamming in Free Space Optical Communication https://www.pathfinderdigital.com/alleviation-of-jamming-in-free-space-optical-communication-over-gamma-gamma-channel-with-pointing-errors?utm_source=rss&utm_medium=rss&utm_campaign=alleviation-of-jamming-in-free-space-optical-communication-over-gamma-gamma-channel-with-pointing-errors https://www.pathfinderdigital.com/alleviation-of-jamming-in-free-space-optical-communication-over-gamma-gamma-channel-with-pointing-errors#respond Wed, 24 Feb 2021 16:30:29 +0000 https://www.pathfinderdigital.com/?p=1167 Overview Most FSO communications systems operate at a limited range of distinct wavelengths (usually 1300 nm or 1550 nm) making them predictable and easily distorted by an intruder. Anti-jamming techniques have been studied broadly for RF networks, but this field is still a new area for FSO. In October 2019, Bhatnagar et al published a paper…

The post Alleviation of Jamming in Free Space Optical Communication appeared first on PathFinder Digital.

]]>
https://www.pathfinderdigital.com/alleviation-of-jamming-in-free-space-optical-communication-over-gamma-gamma-channel-with-pointing-errors/feed 0
Confining Light in 3-D Space https://www.pathfinderdigital.com/confining-light-in-3-d-space?utm_source=rss&utm_medium=rss&utm_campaign=confining-light-in-3-d-space https://www.pathfinderdigital.com/confining-light-in-3-d-space#respond Tue, 19 Jan 2021 20:01:17 +0000 https://www.pathfinderdigital.com/?p=1119 New communication technology such as ultra-wideband and 5G is increasing the demand for Photonic Integrated Circuits (PIC). PIC was thought of as being a planar structure that can only guide light in a single plane but research from Dr. Gao Hongwei, from the Singapore University, shows that PIC can be 3-D structures that can guide…

The post Confining Light in 3-D Space appeared first on PathFinder Digital.

]]>
https://www.pathfinderdigital.com/confining-light-in-3-d-space/feed 0
Transportable Optical Ground Station (TOGS) https://www.pathfinderdigital.com/transportable-optical-ground-station-togs?utm_source=rss&utm_medium=rss&utm_campaign=transportable-optical-ground-station-togs https://www.pathfinderdigital.com/transportable-optical-ground-station-togs#respond Wed, 16 Dec 2020 21:37:40 +0000 https://www.pathfinderdigital.com/?p=1094 Overview Transportable Optical Ground Station (TOGS). See Optical Ground Station (OGS). Near real-time data downlinks from aircrafts, satellites and high altitude platforms via high-speed laser communication links is an important research topic at the Institute of Communications and Navigation of the German Aerospace Center (DLR). Ground stations for such scenarios are usually fixed at a…

The post Transportable Optical Ground Station (TOGS) appeared first on PathFinder Digital.

]]>
https://www.pathfinderdigital.com/transportable-optical-ground-station-togs/feed 0
Mitigation Techniques for FSO https://www.pathfinderdigital.com/mitigation-techniques-for-fso?utm_source=rss&utm_medium=rss&utm_campaign=mitigation-techniques-for-fso https://www.pathfinderdigital.com/mitigation-techniques-for-fso#respond Wed, 09 Dec 2020 17:17:43 +0000 https://www.pathfinderdigital.com/?p=1092 Overview Environmental conditions create significant obstructions to completing satellite-to-ground links (SGL) with OGSs. Multiple potential approaches exist to negate environmental effects and maximize transmission efficiency. Those approaches may be considered in two basic categories: Methods to improve the reliably of the FSO link Methods to bypass a faulty link in favor of a reliable alternate…

The post Mitigation Techniques for FSO appeared first on PathFinder Digital.

]]>
https://www.pathfinderdigital.com/mitigation-techniques-for-fso/feed 0
Areas of Ongoing FSO Research https://www.pathfinderdigital.com/areas-of-ongoing-fso-research?utm_source=rss&utm_medium=rss&utm_campaign=areas-of-ongoing-fso-research https://www.pathfinderdigital.com/areas-of-ongoing-fso-research#respond Sat, 05 Dec 2020 02:07:19 +0000 https://www.pathfinderdigital.com/?p=1087 Overview FSO is an emerging field where uncertainties exist in applications, fundamentals, and ways to utilize technology. As with all optics-based technologies, the largest obstacle to growth is signal attenuation in communication links. Research institutions, private companies, and government agencies are all conducting individual experiments and studies to broaden understanding and advance FSO technologies. Some…

The post Areas of Ongoing FSO Research appeared first on PathFinder Digital.

]]>
https://www.pathfinderdigital.com/areas-of-ongoing-fso-research/feed 0