Inducing periodicity from chaotic oscillations of a compound-cavity laser diode is numerically demonstrated through the Van der Pol model. The deep modulation beyond the limit of the perturbation approximation leads to both turbulence and periodicity. Bifurcation against the modulation frequencies and modulation depth occurs under proper conditions. Therefore it is found that the different periodicity can be induced from chaos by a small change in the frequency and the amplitude of the periodic modulations.
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