A multi-section complex-coupled distributed feedback (DFB) laser device includes first and second device sections. Selection of the configuration and material(s) composing the DFB laser device causes self-pulsation of the light generated by such device. A light mode of a reflectivity spectrum for the first device section coincides with a side lobe of the reflectivity spectrum for the second device section. In addition, a light mode of the reflectivity spectrum of the second device section is arranged to be within the stop band of reflectivity spectrum for the first device section. The gratings of the sections can be in contact with electrodes coupled to receive injection current or a radio-frequency signal. Related systems and methods are also disclosed.
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