In this paper, we propose and demonstrate a novel generation scheme for the optical frequency comb (OFC), which ispumped by the optical injection and enhanced by the self-recirculating modulation. A directly modulated semiconductorlaser under the optical injection is driven into the nonlinear period-one oscillation dynamic, which provides a primaryOFC seed source with only several sparse comb lines and poor flatness. An enhanced OFC can be generated bymodulating this directly modulated semiconductor laser in a closed loop, wherein the modulating signal is derived fromthe primary OFC. The performance of the proposed OFC is optimized through controlling the injection parameters andthe self-recirculating modulation index.
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