The design objective of this laser is to make a single-mode laser with target wavelength of 1550nm, with good wall-plug efficiency. To ensure these requirements are met, we designed a Bragg grating with high reflectivity , and simulated a circuit of the laser with SOA on Lumerical INTERCONNECT. Then "Cold Cavity" simulations were done by replacing the RSOA with a waveguide and mirror were done to confirm the Bragg grating parameters, as shown in Fig. 3. The length of the waveguide is 38μm to ensure several modes can be observed for analysis. Final simulations of the complete laser design is done once the parameters were chosen for best expected performance. The SiP design was also made in klayout to check for fabrication issues.