Abstract
A novel ridge-waveguide multisection (MS) distributed feedback (DFB)laser, which consists of two identical DFB sections but different ridgewidths, is proposed to generate beating-type self-pulsations (SPs). Thespatiotemporal dynamic response of such a multisection DFB laser iscalculated based on a large-signal travelling-wave model. Self-pulsatingoutput at about 150 GHz is predicted, and evidences for the beatingmechanism of the SPs are provided. To the best of our knowledge, this isthe first report on SP generated by MS-DFB lasers with varied ridgewidth. Compared to other alternatives, such devices are much easier toimplement and also enjoy the advantages of lower cost and higher designfreedom.
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