Design rules for a low-chirp integrated DFB laser with an electroabsorption modulator

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Abstract
Feedback from the front facet of an integrated DFB laser with an electroabsorption modulator generates additional chirp to the single modulator. The reduction of the sensitivity to that feedback is in tradeoff relation with the external differential quantum efficiency and the single-mode yield. We introduce a figure-of-merit for the feedback sensitivity. It is obtained from the modeling of the small signal frequency modulation (FM). It indicates design rules for low-chirp and high-efficiency devices.