Abstract
The focus of this chapter is on fiber-optic communication systems. Even though the nonlinear effects were found to be irrelevant for the systems designed in the 1980s, the situation changed dramatically with the advent of optical amplification, dispersion management, and wavelength division multiplexing. The nonlinear effects in optical fibers are of paramount concern for optimizing modern lightwave systems. The techniques for managing the fiber's loss and group-velocity dispersion are discussed in Section 7.1 as an introduction to system-related issues. Section 7.2 is devoted to the impact of five major nonlinear effects: stimulated Brillouin and Raman scattering, self- and cross-phase modulation, and four-wave mixing. The use of optical solitons is discussed briefly in Section 7.3. Section 7.4 describes intrachannel nonlinear effects in the context of pseudolinear systems. The use of coherent detection is discussed in Section 7.5. The focus of Section 7.6 is on space-division multiplexing considered after 2010.
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