Pump-probe study on nonlinear switching in an all-active-semiconductor-optical-amplifier loop device

Abstract

We report the pump-probe study results of the nonlinear switching behaviors in an all-activesemiconductor-optical-amplifier loop device as depicted in Fig. 1. The ridge-loading waveguide loop has a radius 300 pm with a ridge width 4 pm. The loop is connected to a multi-mode interference (MMI) waveguide with a length 500 pm and a ridge width 8 pm which serves as the nonlinear element. Then, the input and output ports are also 4 pm waveguides with both lengths about 100 p n . For injecting different currents in different