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Optical Satellite Communication seminar report


Posted by: electronics seminars
Created at: Tuesday 05th of January 2010 03:39:00 AM
Last Edited Or Replied at :Wednesday 15th of February 2012 03:27:03 AM
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NTEGRATED TRANSNHTTER
The integrated transmitter is shown schematically below.

This consists of a prime/redundant pair of laser modules, a redundancy switch, and a point ahead assembly (PAp). The lasers are connected to the PM by a single mode polarisation. This allows grater layout flexibility on the optical bench and simplifies redundancy switching. Each laser module contains a laser diode, collimating lenses, cylindrical le and focusing lense for coupling light into the fiber. Coupling effiency into the fiber is expected to exceed 70%.

The point ahead angular is ±20..................[:=> Show Contents <=:]



Optical Free Space Communication


Posted by: audithya
Created at: Friday 23rd of October 2009 12:19:03 AM
Last Edited Or Replied at :Friday 23rd of October 2009 10:01:33 AM
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seminars on above topi..................[:=> 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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tical cable. These beams of light, operating in 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 c..................[:=> 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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ough 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 providing high bandwidth to point-to-point connections. The attenuation characteristics of free space make inter-satellite connections a promising application for optical free space communication. Systems of this kind are already being deployed as a communications media in a number of k..................[:=> 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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ds for bandwidth cannot be satisfied because the next fibre backbone is too far away. Laser links between the backbone and the user can provide quickly a high bandwidth much more cost effective than with other technologies. Due to the atmospheric effects on the propagation of light only short distance links can be established assuring a comparable bit error rate to fibre networks. With optical free space communication devices it's as well possible to replace lower speed wired lines between computer networks with fibre-like delay-free high bandwidth. It turned out as well that optical free spac..................[:=> Show Contents <=:]



FIBRE OPTIC COMMUNICATION


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 01:27:41 PM
Last Edited Or Replied at :Saturday 16th of July 2011 05:51:40 AM
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Fiber optics use light rather than electricity to transmit data. In a fiber optic system, electricity is converted into light by a LED ..................[:=> Show Contents <=:]



Global System for Mobile Communication GSM


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 12:49:27 AM
Last Edited Or Replied at :Tuesday 02nd of November 2010 07:23:59 AM
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of digital radio technology.

The GSM standard is intended to address these problems. GSM provides recommendations, not requirements. The GSM specifications define the functions and interface requirements in detail but do not address the hardware. The reason for this is to limit the designers as little as possible but still to make it possible for the operators to buy equipment from different suppliers. The GSM network is divided into three major systems: the switching system (SS), the base station system (BSS), and the operation and support system (OSS).

The operations and maintenance c..................[:=> Show Contents <=:]



Cellular Communications


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 12:38:42 AM
Last Edited Or Replied at :Sunday 21st of September 2008 12:38:42 AM
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communications technology since the 1980's, working initially in GSM and more recently in the definition and development of 3G (UMTS). Roke Manor Research has over 200 engineers with experience in designing hardware and software for 3G terminals and base stations and is currently developing technology for 4G and beyond.

We are uniquely positioned to provide 2G, 3G and 4G expertise to our customers.
The role of Roke Manor Research engineers in standardisation bodies (e.g. ETSI and 3GPP) provides us with intimate knowledge of all the 2G and 3G standards (GSM, GPRS, EDGE, UMTS FDD (WCDMA) a..................[:=> Show Contents <=:]



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