The optical time domain reflectometer (OTDR) is a special instrument in the test of optical fiber communication link. As the key compoment of OTDR, the performance of semiconductor laser directly influences the characteristics of OTDR, such as test distance, test precision, etc. In order to meet the application requirements of OTDR, a kind of ridged waveguide laser chip with separate confinement heterostructure (SCH)was proposed. The SCH can improve the output power and slope efficiency of the lasers. Meanwhile, the quantum well structure was adopted to improve the temperature characteristic. For the developed semiconductor lasers working at the wavelength of 1550nm±20nm, the output efficiency of the single mode fiber exceeds 60mW at the working current of 300mA under 25℃, and the rise/fall time is less than 1ns, meeting the requirements of long-distence and high precision in OTDR applications.