Introduction
Gain-cramped-semiconductor. optical amplifiers (GC-SOAs) are useful for amplifiers and fast space switches for wavelength divison multiplexed (WDM) optical networks 'because of constant: gain⋅. characteristics⋅. against. input power variation Most-of GC-SOAs have been realized by adopting laser cavities in amplifier section [3] [4]. However, lasing mechanism also resulted-in high noise figure (NF). and limited switching speed due to relaxation oscillation (RO)⋅⋅.