阅读说明：本技术 双腔dfb激光器芯片、光发射组件、光模块及光网络装置 (Double-cavity DFB laser chip, light emitting assembly, optical module and optical network device ) 是由 黄利新 任正良 王泽林 于 2019-03-12 设计创作，主要内容包括：本申请提供一种双腔DFB激光器芯片、光发射组件、光模块及光网络装置,在芯片基底组件上方沿光栅延伸方向间隔设置第一光栅和第二光栅。第一光栅的任意一个第一刻蚀区的沿光栅延伸方向的正投影与第二光栅的任意一个第二刻蚀区的沿光栅延伸方向的正投影之间具有相对位移,以使得第一光栅与第二光栅之间具有相位差,且第一光栅和第二光栅经过解理所形成的解理端面相位不同,因此,第一光栅对应的DFB激光器与第二光栅对应的DFB激光器的边模抑制比和斜率效率都会产生明显差异,总有一个DFB激光器的边模抑制比和斜率效率等性能指标满足性能要求,以便在封装时选择性能更优越的DFB激光器进行封装,提高了双腔DFB激光器芯片的成品率。(The application provides a two-chamber DFB laser chip, light-emitting subassembly, optical module and optical network device, sets up first grating and second grating along the grating extending direction interval above the chip basement subassembly. The orthographic projection of any one first etching area of the first grating along the grating extending direction and the orthographic projection of any one second etching area of the second grating along the grating extending direction have relative displacement, so that a phase difference exists between the first grating and the second grating, and the phase of a cleavage end face formed by cleaving the first grating and the second grating is different, therefore, the side mode rejection ratio and the slope efficiency of the DFB laser corresponding to the first grating and the DFB laser corresponding to the second grating can generate obvious difference, the performance indexes such as the side mode rejection ratio, the slope efficiency and the like of one DFB laser always meet the performance requirements, so that the DFB laser with better performance is selected for packaging during packaging, and the yield of the double-cavity DFB laser chip is improved.)