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Optical Networks - _Chapter 3 Components_34

Optical Networks - _Chapter 3 Components_34 - component...

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3 chapter Components I n this chapter , we will discuss the physical principles behind the operation of the most important components of optical communication systems. For each component, we will give a simple descriptive treatment followed by a more detailed mathematical treatment. The components used in modern optical networks include couplers, lasers, pho- todetectors, optical amplifiers, optical switches, and filters and multiplexers. Cou- plers are simple components used to combine or split optical signals. After describing couplers, we will cover filters and multiplexers, which are used to multiplex and de- multiplex signals at different wavelengths in WDM systems. We then describe various types of optical amplifiers, which are key elements used to overcome fiber and other
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Unformatted text preview: component losses and, in many cases, can be used to amplify signals at multiple wavelengths. Understanding lters and optical ampliers is essential to understand-ing the operation of lasers, which comes next. Semiconductor lasers are the main transmitters used in optical communication systems. Then we discuss photodetec-tors, which convert the optical signal back into the electrical domain. This is followed by optical switches, which play an important role as optical networks become more agile. Finally, we cover wavelength converters, which are used to convert signals from one wavelength to another, at the edges of the optical network, as well as inside the network. 113...
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