Free space optical communications is a line-of-sight (LOS) technology that transmits a modulated beam of visible or infrared light through the atmosphere for broadband communications. In a manner similar to fiber optical communications, free space optics uses a light emitting diode (LED) or laser (light amplification by stimulated emission of radiation) point source for data transmission. However, in free space optics, an energy beam is collimated and transmitted through space rather than being guided through an optical cable. These beams of li ....etc

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INTRODUCTION

Optical networking is a means of communication that uses signals encoded onto light to transmit information among various nodes of a telecommunications network. They operate from the limited range of a local-area network (LAN) or over a wide-area network (WAN), which can cross metropolitan and regional areas all the way to national, international and transoceanic distances. It is a form of optical communicat ....etc

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OPTICAL devices

INTRODUCTION
Explosive information demand in the internet world is creating enormous needs for capacity expansion in next generation telecommunication networks. It is expected that the data- oriented network traffic will double every year. Optical networks are widely regarded as the ultimate solution to the bandwidth needs of future communication systems. Optical fiber links deployed between nodes are capable to carry terabits of information but the electronic switching at the nodes limit th ....etc

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Abstract
Most device drivers have one ulterior motive and one target to achieve - deliver the maximum using the minimum. No matter how stable or feature rich a device driver might be, if it cannot perform in terms of high throughput and low CPU utilization, it is as good as any other run of the mill driver.The objective of this topic is to use the thinking out of the box concept and expose techniques, which go beyond just good programming principles to get that extra edge which can put your next driver into the elite group of high perform ....etc

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Ppt of OPTICAL OFDM FOR HIGH SPEED WIRELESS OPTICAL COMMUNICATION
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3.26 Consider an EDFA that is required to amplify wavelengths between 1532 nm and
1550 nm within the C-band (separated by 100 GHz).
(a) Draw a schematic of this basic EDFA, and assume the pump laser is selected
to minimize ASE. Also, be sure to prevent backward re ections at the EDFA
input/output.
(b) Draw the relevant energy bands and associated energy transitions between
these bands.
(c) How many wavelengths could be ampli ed within this range (and spacing)?
(d) Compute the required r ....etc

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