A 1.3μm two-section multi-quantum well refective semiconductor optical amplifier is designed and fabricated. The impacts of injection current density ratio and the reflectivity of the reflective facet on gain, sat- uration and noise characteristics are studied theoretically and experimentally. The results indicate that the gain and saturation power can be easily manipulated by changing the current density ratio; and better gain and noise characteristics can be obtained when the reflectivity is appropriately selected.
