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Low-Receive Footprint

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Low-Receive FootprintLow-Receive Footprint

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Unchanged: <h3>Overview</h3>Unchanged: <h3>Overview</h3>
Unchanged: The "signal footprint" of a transmission refers to how much a signal diverges from transmitter to receiver. For example, when an RF signal is sent from a satellite to the ground, the signal footprint can spread out from the 1-meter transmitter to the size of a continent. Not only does a large footprint cause a signal to lose power, but it also opens the signal up to interception.Unchanged: The "signal footprint" of a transmission refers to how much a signal diverges from transmitter to receiver. For example, when an RF signal is sent from a satellite to the ground, the signal footprint can spread out from the 1-meter transmitter to the size of a continent. Not only does a large footprint cause a signal to lose power, but it also opens the signal up to interception.
Unchanged: An FSO signal has low divergence from transmitter to receiver because its source is a laser. Laser beams have small beam widths which stay small for the entirety of transmission due to the collimated nature of the light. To intercept a laser beam transmission, an eavesdropper would have to be in the path of the beam which would immediately let the receiver know that the signal is being listened to (see <a href="https://wiki.pathfinderdigital.com/wiki/interception-resistance/">Interception Resistance</a>). This makes FSO transmissions much harder to intercept, decreasing its security risk.Unchanged: An FSO signal has low divergence from transmitter to receiver because its source is a laser. Laser beams have small beam widths which stay small for the entirety of transmission due to the collimated nature of the light. To intercept a laser beam transmission, an eavesdropper would have to be in the path of the beam which would immediately let the receiver know that the signal is being listened to (see <a href="https://wiki.pathfinderdigital.com/wiki/interception-resistance/">Interception Resistance</a>). This makes FSO transmissions much harder to intercept, decreasing its security risk.
Unchanged: For example, a LEO-to-ground FSO link has a laser beam footprint of 100 m. This is much smaller than a continent-sized RF footprint, making the signal much more difficult to intercept. The same is also true about satellite-to-satellite communication. <a class="external autonumber" href="https://pdfs.semanticscholar.org/3187/3c8f71334857db18f7da61066ab272435ded.pdf" rel="nofollow">[1]</a>Unchanged: For example, a LEO-to-ground FSO link has a laser beam footprint of 100 m. This is much smaller than a continent-sized RF footprint, making the signal much more difficult to intercept. The same is also true about satellite-to-satellite communication. <a class="external autonumber" href="https://pdfs.semanticscholar.org/3187/3c8f71334857db18f7da61066ab272435ded.pdf" rel="nofollow">[1]</a>
Deleted: <a class="external autonumber" href="https://govtribe.com/opportunity/federal-contract-opportunity/public-private-partnerships-to-advance-optical-and-rf-space-communications-and-navigation-scan-capabilities-and-services-nnc17zch025l" rel="nofollow">[1]</a> 
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Unchanged: <h3><b>Related Links</b></h3>Unchanged: <h3><b>Related Links</b></h3>
Deleted: <a class="external text" href="https://www.osa-opn.org/home/articles/volume_27/may_2016/features/space-based_laser_communications_break_threshold/" rel="nofollow">Article: Space-Based Laser Communications Break Threshold (for https://www.osa-opn.org/home/articles/volume_27/may_2016/features/space-based_laser_communications_break_threshold</a> Added: <a class="external text" href="https://www.osa-opn.org/home/articles/volume_27/may_2016/features/space-based_laser_communications_break_threshold/" rel="nofollow">Article: Space-Based Laser Communications Break Threshold (for internet-like speeds in intrasatellite communication)</a>
Deleted: <a class="external text" href="https://www3.cs.stonybrook.edu/~hgupta/ps/hotnets13_fsodc.pdf" rel="nofollow">https://www3.cs.stonybrook.edu/~hgupta/ps/hotnets13_fsodc.pdf</a> Added: <a class="external text" href="https://www3.cs.stonybrook.edu/~hgupta/ps/hotnets13_fsodc.pdf" rel="nofollow">Paper: A Case for Free-Space Optics in Data Centers</a>