chapter 4
Modulation and Demodulation
OUR GOAL IN THIS CHAPTER is to understand the processes of modulation and demodulation of digital signals. We start by discussing modulation, which is the process of converting digital data in electronic form to an optical signal that can be transmitted over the fiber. We then study the demodulation process, which is the process of converting the optical signal back into electronic form and extracting the data that was transmitted.
Mainly due to various kinds of noise that get added to the signal in the transmission process, decisions about the transmitted bit (0 or 1) based on the received signal are subject to error. In this chapter, we derive expressions for the bit error rate introduced by the whole transmission ...
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