Oscillation modes of laser diode pumped hybrid bistable system with large delay and application to dynamical memory

An electrooptical bistable system with a very large delay was constructed, and self-oscillation phenomena were investigated. Many multistable self-oscillation modes were observed, including second-order bifurcations of the 265th harmonic. The dynamical memory function was demonstrated by locking second order bifurcated modes to external clock oscillations and performing WRITE and READ of binary data sequences in the waveforms of the bifurcated modes. The nonlinear bifurcation phenomena in this system are applicable for large-capacity memory and signal processing. Spurious preferential excitation of particular harmonic modes was related to the fine structure in the transfer spectrum of the open loop associated with spurious resonances in the electrooptical modulator used as a nonlinear element