“…The speed of the wavelength conversion can also be enhanced by using two cascaded SOAs, called 'Turbo-Switch' (Manning et al, 2006). Wavelength conversion can also be achieved by arranging two or more SOAs in the MZI configuration (Ratovelomanana et al, 1995, Durhuus et al, 1994, Idler et al, 1995, as shown in Fig. 8.…”