A new physical model of the light amplifying optical switch (LAGS)

A new physical model of determining the static I-V curve of the light amplifying optical switch (LAOS) is derived. The model is based on deriving the currents of the HPT and the feedback current of the LAOS. The feedback currents for optical and/or electrical feedback are determined by solving the continuity equation in the collector and the base of the HPT. A negative resistance region in the I-V curve is obtained and controlled by varying the feedback coefficient of the device and the Early effect coefficient. The main factors affecting the negative resistance region are the feedback coefficient, Early effect, the recombination currents in the emitter-base space-charge region, and the ratio of the collector to base doping. The switching voltage of the device is also calculated for different parameters.<
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