Nonuniform DFB-SOAs: dynamic Characteristics of bistability and a novel configuration based on linearly variable current injection

Non-uniform Grating Effects On Dynamic Characteristics of Bistable DFB Semiconductor Laser Amplifiers

“…Hurtado also described a twowavelength switch using a bistable DFB-SLA [11]. The effects of phase shift and chirp on the distortion of the falling edge of the output pulse of a bistable DFB-SLA was analyzed by Zheng-Mao Wu et al [12]. Recently, the effects of trapezoidal tapered gratings on the bistable characteristics of a quarter wavelength phase-shifted DFB-SLA have been analyzed by the authors.…”

“…But in the previous works performed for this purpose, the common approximation was that the optical fields respond instantly to change in the carrier concentration. Therefore, the optical fields attained their steady state quickly and the system dynamics were determined solely by the gain rate equation which was based on the carrier rate equation [4], [8], and [12]. However, through our approach, without attention to this approximation, the forward and backward fields are determined by solution of the time-dependent couplemode equations using the finite difference time-domain (FDTD) method.…”