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Optical Free Space Communication


Posted by: Computer Science Clay
Created at: Wednesday 25th of February 2009 03:06:42 AM
Last Edited Or Replied at :Wednesday 25th of February 2009 03:06:42 AM
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erties of the 1st. Many aspects are related to fib..................[:=> Show Contents <=:]



Optical Communications in Space


Posted by: computer science crazy
Created at: Wednesday 16th of September 2009 02:07:52 PM
Last Edited Or Replied at :Wednesday 15th of February 2012 01:17:43 AM
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laser terminals having been flight tested for integration with their host spacecraft. At the same time, ESA is preparing itself for a new challenge: the potential massive use of optical cross links in satellite constellations for mobile communications and global multimedia services. This is an opportune moment to look back at the past twenty years of ESA effort in laser communications, to take stock of the results achieved and to reflect on ways to face the challenges of the future.

Introduction
Twenty years ago, in summer 1977, ESA placed a technological research contract for the assess..................[:=> Show Contents <=:]



optical space communication or Free-space optical communicationFSO


Posted by: computer science crazy
Created at: Sunday 13th of September 2009 07:43:26 PM
Last Edited Or Replied at :Wednesday 15th of February 2012 01:17:53 AM
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the TeraHertz portion of the spectrum, are focused on a receiving lens connected to a high sensitivity receiver through an optical fiber. Unlike radio and microwave systems, free space optical communications requires no spectrum licensing and interference to and from other systems is not a concern. In addition, the point-to-point laser signal is extremely difficult to intercept, making it ideal for covert communications. Free space optical communications offer data rates comparable to fiber optical communications at a fraction of the deployment cost while extremely narrow laser beam widths pro..................[:=> Show Contents <=:]



Driving Optical Network Evolution


Posted by: computer science crazy
Created at: Tuesday 07th of April 2009 01:31:34 PM
Last Edited Or Replied at :Thursday 19th of January 2012 11:16:50 PM
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ologies will have.

Specifically, the new technologies in the metro space provide better and more profitable economics, scale, and new services and business models. The current metro infrastructure comprises this equipment, which emphasizes voice traffic; is limited in scalability; and was not designed to take advantage of new technologies, topologies, and changing traffic conditions.

Next-generation equipment such as next-generation Synchronous Optical Network (SONET), metro core dense wavelength division multiplexing (DWDM), metro-edge DWDM, and advancements in the optical core have ta..................[:=> Show Contents <=:]



Optical Free Space Communication


Posted by: Computer Science Clay
Created at: Wednesday 25th of February 2009 03:06:42 AM
Last Edited Or Replied at :Wednesday 25th of February 2009 03:06:42 AM
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fers high data rates and is much less expensive than underground fibre. But there are a few restrictions, which may mean it remains an alternative. Many engineers are familiar with one of two successful existing technologies for data communication:

(1) Guided wave (e.g. fibre optics) and
(2) wireless free space communication (e.g. RF). Fibre optics offers extremely high bandwidths for high data rate, while RF communications offers the advantage of wireless connectivity and the ability to broadcast over a wide area. Optical free space communication fits into the 2nd group, but has some pr..................[:=> Show Contents <=:]



Free Space Laser Communications


Posted by: computer science crazy
Created at: Monday 22nd of September 2008 12:11:49 AM
Last Edited Or Replied at :Tuesday 05th of February 2013 12:32:14 PM
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al control electronics that must control the gimbals and other steering mechanisms, and servos, to keep the acquisition and tracking system operating in the designed modes of operation.

Operation
Free space laser communications systems are wireless connections through the atmosphere. They work similar to fiber optic cable systems except the beam is transmitted through open space. The carrier used for the transmission of this signal is generated by either a high power LED or a laser diode. The laser systems operate in the near infrared region of the spectrum. The laser light across the link..................[:=> Show Contents <=:]



Optical Free Space Communication


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 11:34:59 PM
Last Edited Or Replied at :Wednesday 15th of February 2012 01:17:57 AM
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ring elements in the air e.g. fog)
_ Shimmer (due to a combination of factors, including atmospheric turbulence, air density, light refraction, cloud cover, and wind which cause a similar disturbance when a laser beam is transmitted through the atmosphere)
_ Moving building (although we are not aware of the movement, buildings often sway from side to side even settle into the ground causing offset to the laser beam and making the receiver laser receive less power)

Applications

Free space applications
Due to its properties optical free space communications is suited very well for provi..................[:=> Show Contents <=:]



Optical Switching


Posted by: computer science crazy
Created at: Saturday 20th of September 2008 11:58:28 PM
Last Edited Or Replied at :Friday 06th of August 2010 02:21:13 PM
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ere replaced by stretches of fiber infused with ions of the rare-earth erbium. When these erbium-doped fibers were zapped by a pump laser, the excited ions could revive a fading signal. They restore a signal without any optical to electronic conversion and can do so for very high speed signals sending tens of gigabits a second. Most importantly they can boost the power of many wavelengths simultaneously.

Now to increase information rate, as many wavelengths as possible are jammed down a fiber, with a wavelength carrying as much data as possible. The technology that does this has a name-dens..................[:=> Show Contents <=:]



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