Chapter 19 Digital Fiber Modulation and Deep Fiber Architectures
19.1 Introduction
This chapter covers binary (digital) modulation of a fiber-optic cable as well as deep fiber architectures. The two are covered together because binary optical transmission is used in last-mile (to the home and/or business) applications. In addition, binary optical transmission is used extensively in metropolitan loops and in intercity trunks. An advantage of digital modulation is that it can operate with much lower signal-to-noise ratio than can analog modulation, as shown in Figure 12.13.
Figure 19.1 illustrates the difference between digital and analog optical modulation. Figure 19.1 (a) represents digital modulation of the optical transmitter. The data is ...
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