The present application provides a double-cavity DFB laser chip, an optical emission component, an optical module, and an optical network device. A first grating and a second grating are provided at intervals above a chip base component along the extension direction of gratings. A relative displacement is comprised between an orthographic projection of any first etching area of the first grating along the extension direction of the gratings, and an orthographic projection of any second etching area of the second grating along the extension direction of the gratings so that a phase difference is comprised between the first grating and the second grating. Moreover, cleavage end surface phases formed by cleavage of the first grating and the second grating are different. Therefore, obvious differences in the side-mode suppression ratio and the slope efficiency of the DFB laser corresponding to the first grating, and the side-mode suppression ratio and the slope efficiency of the DFB laser corresponding to the second grating are generated. There is surely a DFB laser of which performance indicators such as the side-mode suppression ratio and the slope efficiency meet the performance requirement so that a DFB laser having a better performance is selected for packaging during package, thereby improving the rate of finished products of the double-cavity DFB laser chip.
展开▼
