This paper presents a new model for semiconductor laser circuit which is established by use of the models for controlled components and devices in the common circuit analysis software SPICE. The model can be used to simulate the nonlinearity

instantaneous response

small—signal frequency response

impedance characteristics of laser

as well as the relation between transmitted optical power and injected circuit. With the model

the laser and relevant circuits can be analysed all through SPICE. The computer simulation results a-gree with the reported theoretical and experimental values.