Picosecond Gain Recovery Dynamics in Semiconductor Optical Amplifiers and Three-Wavelength Devices

Abstract

Based on density matrix equations, a broad-band timedomain large-signal model for semiconductor optical amplifiers (SOAs) is established. Accounting for spectral hole burning, carrier heating and carrier density modulation (CDM), we analysis the gain dynamics in a SOA stimulated by a 1ps pump pulse. On picosecond timescale, the ultrafast component of gain recovery dynamics is wavelength dependency. Furthermore, in three-wavelength devices, the long-lived recovery tail induced by CDM can be reduced by proper continuous-wave assistant light in gain region close to gain transparency point. And then the full gain recovery time up to 1.04ps is obtained.

Dynamics and its Effects on Saturation Region in Semiconductor Optical Amplifiers

“…The spectral (almost symmetric) hole will be burned in the distribution of carrier; for this reason, this influence is known as SHB. It is an '' ultrafast " impact on the temporal scale of a few fs [22].…”