A facet-free surface-emitting distributed feed-back (DFB) laser is proposed for a low-cost optical module. A 45° mirror is integrated on front of a DFB laser for surface emission. Instead of a facet with a high-reflection (HR) coating, a distributed Bragg reflector mirror, a photodiode, and a window structure are integrated on its rear. It is experimentally confirmed this rear structure work same as the facet with the HR coating. The proposed facet-free laser demonstrated on-wafer measurement and attained high-reliability under high humidity. These results indicate the proposed laser can be manufactured cost-effectively without chip-level screenings and used in non-hermetic packages.