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The voltage-current characteristic of the absorber of a twin section laser diode is investigated as a function of the gain section current. For self pulsation to occur the absorber must be operated within a specific region of the voltage-current characteristics. This region only exists for absorber voltage current characteristics which contain an S-shaped negative resistance.
Farrell, G., Phelan, P., Hegarty, J.: Self-propulsation operating regime for the Absorber of a twin section laser diode. Electronic Letters, Vol.27, no. 16, pp.1403-1404. 1991.