Abstract
We proposed a novel extended semiconductor optical amplifier （SOA） model for applications in femtosecond pulse transmission，in which various ultrafast nonlinear effects，such as gain dispersion and group velocity dispersion were taken into account. We analyzed the refractive index in response to variation of the input current and the length of SOA. Furthermore，the impact of carrier density pulsation and carrier heating on the refractive index dynamics of SOA was discussed respectively. The simulation model can be applied in parameter and operation condition optimization of SOAs in order to improve their femtosecond dynamic characteristics.
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