I want to mention that the component simulates a reflective semiconductor optical amplifier (RSOA) model with bulk material as the active element . This SOA model is based on the numerical solution of a set of coupled differential equations that describe the interaction between the carrier density and photon rates along the active layer length. The rate and propagation equations solved in this model are similar to the ones described in the Wideband Traveling Wave SOA technical background, however the value of the injection current here is considered as an input signal allowing the modulation of the optical signal by the SOA. This component also considers the possibility of sensing the differences in voltage produced at the bias electrode of the single-section SOA.
You may refer to the link http://optiwave.com/forums/topic/reflective-semiconductor-optical-amplifiers-optical-system/