The laser described in this paper is working in OW PM mode-locking operation. The mode-looking states have been separated in this laser. The stable operation for a long time has been obtained. The pulsewidth of the output pulse is 66 ps, and the bandwidth is 10.6 GHz. The stability of the pulse amplitude is ±3%. The average output power is 200mW. The maximum oscillation bandwidth is 15.6 GHz and the corresponding pulse width is less than 50 ps.