Feedback filter effects in the dynamics of a tunable DBR laser with nonlinear delay optoelectronic loop

An optoelectronic wavelength nonlinear delay dynamics is investigated experimentally. The particular influence of the filtering feedback determining the differential process of the dynamics is reported. Multiple time scales phenomena ranging over several orders of magnitude are observed, under various parameter and filtering feedback conditions. Time-frequency approach with wavelet transform is proposed in order to analyze multi scale behavior of the recorded time series. The influence of the characteristic delay frequency, and its location in the Fourier spectrum with respect to the filtering feedback cut-off is also reported. The observed behavior is connected to various applications in random number generation, chaos communications, and high spectral purity microwave generation.