Space_Optics

Space_Optics - A Seminar on Free Space Optics

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A Seminar on Free Space Optics www.powerpointpresentationon.blogspot.com
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Introduction Free-Space Optics (FSO) is a fiber less, laser-driven technology that supports high bandwidth, with easy to install connections for the last- mile and campus environments. Free space links behave similarly to fiber optic systems. Instead of focusing the output of a semiconductor laser or Light Emitting Diode (LED) into a strand of optical fiber, the output is broadcast in a thin beam across the sky at a receiver unit. FSO equipment tends to operate in two frequency bands 780nm-900nm and 1500-1600nm.
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Need for FSO The demand for bandwidth is increasing exponentially and is expected to do so in the foreseeable future. The explosion of the Internet and Internet based applications has fuelled the bandwidth requirements on the wide area network Ethernet networks have evolved from 10 Mbps Ethernet to fast Ethernet and recently to 1 Gbps Ethernet. Business applications have grown out of the physical boundaries of the enterprise and gone ‘wide area’, linking remote vendors,suppliers, and customers in a ‘new web of business applications’.
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Contd- OFC n/w using DWDM have provided massive B.W. in the hands of the service provider . However, laying high capacity of OFC N/W is expensive &generally a lot of capacity remains unutilised,rendering these N/W uneconomical. Extensive trenching requires for laying OFC is also a disincentive. So the choice of wireless technology for band width, last mile connectivity till in favour of LMDS and FSO. LMDS, being RF technology has its own limitation. It requires LOS operation Since, LMDS works in the frequency band of 28 to 31 GHz, multi path interference is not much of an issue. However , LMDS is extremely susceptible to rainfall because the wavelength of LMDS (10 nm at 28 to31 GHz.) is comparable to size of rain drops.Also rainfall cause depolarization of LMDS signal, decreasing protection against interference.
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Drawback of LMDS Higher initial investment Roof rights are required Frequencies are licensed Fading due to rainfall Complex set-up Medium to high deployment time
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The concept behind FSO is simple. FSO uses a directed beam of light radiation between two end points to transfer information(data, voice or even video). This is similar to traditional OFC networks, except that light pulses are sent through free air instead of OFC cores. It’s based on connectivity between FSO units each consisting of optical transceiver with a laser Tx and Rx. to provide full duplex capability. Each FSO units uses a high power optical source(laser), plus a lens that transmit light through the atmosphere to another lens receiving information. FSO technology require no spectrum licensing. Currently, FSO iffers a
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This note was uploaded on 01/05/2012 for the course ECEN 212 taught by Professor Hamilton during the Fall '11 term at BYU.

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Space_Optics - A Seminar on Free Space Optics

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