Short cavity lasers have several advantages such as improved output linearity in comparison with long lasers, longitudinal oscillation mode stabilized against the injection level and the operating temperature, and large mode spacing for allowing single-mode operation. In this paper, a short cavity laser has been successfully fabricated. The waveguides of laser diodes were formed by wet-etching with width of 4£gm. A SiO2 thin film was then sputtered onto the sample as surface passivation layer, after that, a PMGI polymer was spun on the sample and used for opening ridge window of metalization. After the SiO2 layers on the top of the ridge were removed, the metalizations were deposited for contact. The final finished laser was 200£gm long. The turn on voltage of the laser diode is 0.8 V with total resistance of 9.8£[. In the CW operation, the threshold current of laser is 20mA with threshold voltage of 1.3V, reaching total output optical power of 8mW at 50mA and 12mW at 70mA. The small signal frequency response is 8GHz (current 70mA). By adopting fiber grating and circulator to filter the main mode, the side mode suppression ratio (SMSR) of single longitudinal mode is about 40dB, showing single mode operation.