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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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used with fibers.

The advantages of such a system are the following:
_ No need for digging up the roads
_ No radio frequency licenses are required
_ Bandwidth is equal or superior to fibre systems and much better ..................[:=> 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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l be in operation in the year 2000, has put ESA in a world-leading position in civilian optical intersatellite links. While SILEX formed the backbone of ESA s optical communications activities in the recent past, additional R&D activities were undertaken to develop attractive second-generation systems, particularly for the commercial satellite market. Indeed, at the turn of the century, literally thousands of intersatellite links - radio-frequency (RF) and optical - are expected to be in operation in commercial multi-satellite constellations providing mobile communications, video conferencing ..................[:=> 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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eters and more for traditional, even newer radio-based technologies such as millimeter-wave radio. Optical wireless products' similarities with conventional wired optical solutions enable the seamless integration of access networks with optical core networks and helps to realize the vision of an
all-optical network. http://www.freespaceoptics.org/freespaceoptics/images/Los_Angeles3.jpg
While fiber-optic cable and FSO technology share many of the same attributes, they face different challenges due to the way they transmit information. While fiber is subject to outside disturbances ..................[:=> 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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edundancy of the network. When people have described and spoken at length about optical networks, they have typically limited the discussion of optical network technology to providing physical-layer connectivity.

When actual network services are discussed, optical transport is augmented through the addition of several protocol layers, each with its own sets of unique requirements, to make up a service-enabling network. Until recently, transport was provided through specific companies that concentrated on the core of the network and provided only point-to- point transport services.

A st..................[:=> 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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]

With the improvements in semiconductors optical free space communication has become n attractive alternative to existing signal conducts as fibre or wireless (RF). It offers 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..................[:=> 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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most difficult because laser beams are typically much smaller than the area of uncertainty. Satellites do not know exactly where they are or where the other platform is located, and since everything moves with some degree of uncertainty, they cannot take very long to search or the reference is lost. Instability of the platforms also causes uncertainty in time. In the ideal acquisition method, the beam width of the source is greater than the angle of uncertainty in the location of receiver. The receiver field of includes the location uncertainty of the transmitter. Unfortunately, this ideal met..................[:=> 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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light modulators...................[:=> 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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between 1,200 and 1,600 nanometers.

Today fibers are pure enough that a light signal can travel for about 80 kilometers without the need for amplification. But at some point the signal still needs to be boosted. Electronics for amplitude signal were 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..................[:=> Show Contents <=:]



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