8
Continuous Phase Modulation Format Optical Systems
This chapter describes the modulation scheme that uses the modulation of the phase lightwave carrier, in which the change of the phase during a one-bit state would be continuous, that is, two frequencies, and hence the term continuous phase frequency shift keying (CPFSK). When the two-frequency signal components are orthogonal, the CPFSK is considered as minimum shift keying (MSK). This scheme is also presented. The generation of modulated signals and propagation and detection schemes are then presented, after which the transmission performance is described.
8.1 Introduction
The generation of MSK requires a linear variation of the phase, and hence a constant frequency of the optical carrier. ...
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