ABSTRACT
Following the presentation of optical modulation by direct and external modulation techniques in Chapter 5, this chapter deals with the advanced modulation formats of lightwave sources by external modulators. This is a broad extension of the modulation employing optical modulators connected at the output of a continuous-wave (CW) laser source. The laser is thus turned on at all times, and the generated optical CWs are then modulated, frequency, phase, or amplitude, through an external optical modulator. The uses of these transmitters in optical communication transmission systems are given, especially those for long-haul transmission at very high bit rate. MATLAB® and Simulink® models are described for the generation of advanced modulation format in the optical domain.
