A new design for an all optical flip flop is introduced. It is based on a nonlinear Distributed\nBragg Reflector (DBR) semiconductor laser structure. The device does not\nrequire a holding beam. An optical gain medium confined between 2 Bragg reflectors\nforms the device. One of the Bragg reflectors is detuned from the other by making its\naverage refractive index slightly higher, and it has a negative nonlinear coefficient\nthat is due to direct absorption at Urbach tail. At low light intensity in the structure,\nthe detuned Bragg reflector does not provide optical feedback to start a laser mode.\nAn optical pulse injected to the structure reduces the detuning of the nonlinear Bragg\nreflector and a laser mode builds up. The device is reset by detuning the second\nBragg reflector optically by an optical pulse that generates electron-hole pairs by direct\nabsorption. A mathematical model of the device is introduced. The model is\nsolved numerically in time domain using a general purpose graphics processing unit\n(GPGPU) to increase accuracy and to reduce the computation time. The switching\ndynamics of the device are in nanosecond time scale. The device could be used for all\noptical data packet switching/routing.
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