Grouping behavior of inter-pulse time intervals for triggered pulses in an AlGaAs/InGaAs multilayer structure

Triggered pulsing in a multi-quantum well structure which shows s-type negative differential resistance (NDR) was investigated. First return maps of the inter-pulse time intervals (IPTI) show an interesting grouping pattern at slower pulse rates. Oscillations in the pulsing threshold level of the MQW device cause the grouping behavior. This pattern of IPTIs is similar to that of thermoreceptors in fish and mammals. Correlation integrals were calculated for IPTI data sets collected under different operational conditions, and correlation dimensions 8.0, 8.0, 8.5, and 10.0 were found for four different data sets. The calculated correlation dimensions indicate that the triggered pulsing shows a high dimensional behavior and that the correlation dimension increases as the pulse rate decreases.