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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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devices similar to those 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 e..................[:=> 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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ESA started to consider optics for intersatellite communications, virtually no component technology was available to support space system development. The available laser sources were rather bulky and primarily laboratory devices. ESA selected the CO2 gas laser for its initial work. This laser was the most efficient and reliable laser available at the time and Europe had a considerable background in CO2 laser technology for industrial applications. ESA undertook a detailed design study of a CO2 laser communication terminal and proceeded with the breadboarding of all critical subsystems which ..................[:=> 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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f energy, only a directional redistribution of energy that may have significant reduction in beam intensity for longer distances.

Physical obstructions: Flying birds or construction cranes can temporarily block a single-beam FSO system, but this tends to cause only short interruptions, and transmissions are easily and automatically resumed. LightPointe's optical wireless products use multi-beam systems (spatial diversity) to address temporary obstructions, as well as other atmospheric conditions, to provide for greater availability.

Building sway/seismic activity: The movement of build..................[:=> 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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o) areas has opened up the next emerging frontier of networking. Providers are now considering emerging lucrative opportunities in the metro space. Whereas traditional or incumbent vendors have been installing optical equipment in the space for some time, little attention has been paid to the opportunity available through the introduction of new technology advancements and the economic implications these technologies 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 in..................[:=> 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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rea. Optical free space communication fits into the 2nd group, but has some properties of the 1st. Many aspects are related to fibre optics with the difference, that the media is air and not fibers. Therefore are the required devices similar to those 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 than RF
_ Doesn't cause interference with existing electromagnetic equipment because interference on narrow band point-to-point c..................[:=> 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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eate less momentum disturbance to any sensitive satellite sensors. Fewer onboard consumables are required over the long lifetime because there is less disturbance to the satellite compared with larger and heavier RF systems. The narrow beam divergence of affords interference-free and secure operation.

Features Of Laser Communications System
A block diagram of typical terminal is illustrated in Fig 1. Information, typically in the form of digital data, is input to data electronics that modulates the transmitting laser source. Direct or indirect modulation techniques may be employed dependin..................[:=> 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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Absorption (caused primarily by the water vapor and carbon dioxide)
_ Scattering (depends of the used wavelength and the number and size of scattering 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 re..................[:=> 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
Switching , Optical, seminar optical switching , optical switching, presentation on optical switching ,
ense wavelength division multiplexing (DWDM ) - that is a paragon of t..................[:=> Show Contents <=:]



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