Diagrammatic analysis applied to the stationary version of the equations describing electron and photon kinetics in semiconductor injection lasers reveals the existence of a feedback loop in the pattern of mutual relationships between parameters. Associated with this loop is the concept of causal feedback. The analysis affords simple approximate expressions for the photon density versus pumping rate characteristic. A fundamental system-theoretical meaning is found for the laser threshold condition as one for which the transmission function of the feedback loop equals-1.
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Šrobár, F. Feedback relationships and threshold current in semiconductor injection lasers: old problems revisited. Opt Quant Electron 25, 27–35 (1993). https://doi.org/10.1007/BF00431003
- Communication Network
- Feedback Loop
- Stationary Version
- Threshold Condition
- Approximate Expression