A simple photonic approach to generating the wideband optical frequency comb (OFC) based on the monolithic integrated semiconductor laser (MISL) subject to the gain-switching effect is proposed and experimentally demonstrated in this work. The impressive hotspots focus on the two following aspects. One is the core device, i.e., MISL, which integrates two DFB lasers onto one chip simultaneously. It is equipped with numerous physical characteristics such as low volume, power consumption, easily integration and so on at the mean time of guaranteeing the nonlinear dynamics of the semiconductor laser itself. The other advantage is the OFC generator (OFCG) is fully self-oscillating attributing to the fact that the feedback RF signal applied to modulate the laser is provided by the MISL itself. In this case, no additional microwave driver is required, leading to the system flexible and convenient. In the experiment, one discernible OFC with a bandwidth of 70.2 GHz and a comb line of 11 within 5-dB amplitude variation is obtained, suggesting this method huge effectiveness.
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