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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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g:
_ 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 connections..................[:=> 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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tical - are expected to be in operation in commercial multi-satellite constellations providing mobile communications, video conferencing and multimedia services. The race is on for the European laser communication industry to enter this lucrative market. Optical technology offers too many advantages in terms of mass, power, system flexibility and cost, to leave the field entirely to RF. With the heritage of twenty years of technological preparation, European industry is well positioned to face this burgeoning demand for commercial laser terminals. The early days when ESA started to consider op..................[:=> 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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system performance capacity. And because FSO is a line-of-sight technology, the interconnecting points must be free from physical obstruction and able to see each other.

Fog: The primary challenge to FSO-based communications is dense fog. Rain and snow have little effect on FSO technology, but fog is different. Fog is vapor composed of water droplets, which are only a few hundred microns in diameter but can modify light characteristics or completely hinder the passage of light through a combination of absorption, scattering, and reflection. The primary answer to counter fog when deployin..................[:=> 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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erns from the enterprise customer, and capabilities to drive optical fiber into metropolitan (metro) 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 bette..................[:=> 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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tractive 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 communications offers the advantage of wireless connectivity and the ability to broadcast over a wid..................[:=> 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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signal processing electronics. There are also terminal 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 re..................[:=> 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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erior to fibre systems and much better than RF
_ Doesn't cause interference with existing electromagnetic equipment because interference on narrow band point-to-point connections is rather unlikely.

But there are as well some limitations:
_ 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 ..................[:=> 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 ,


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-dense wavelength division multiplexing (DWDM ) - that is a paragon of technospeak.Switches are needed to route the digital flow to its ultimate destination. The enormous bit conduits will flounder if the light streams are routed using conventional electronic switches, which require a multi-terabit signal to be converted into hundreds of lower-speed electronic signals. Finally, switched signals would have to ..................[:=> Show Contents <=:]



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