We fabricated Fiber Grating Lasers (FGLs) which consist of a Strained-LayerMultiple-Quantum-Well Semiconductor Optical Amplifier (SL MQW SOA) and an externally distributed Fiber Bragg Grating (FBG) reflector to evaluate its potential for use in Wavelength Division Multiplexing (WDM) systems.By using 600μm long SL MQW SOAs, the fiber output power through an inline isolator is higher than 15 mW at 100 mA at 20 to 30°C To the best of our knowledge, our resulting level of performance is higher thanany previously reported. On the other hand, the limit of data rates is specified with relaxation frequency.In order to achieve high bit rates, a Bragg grating is positioned beside a lensed fiber end to obtain shorter cavity length. The lasers achieve 2.5 Gbit/s direct intensity modulation, according to evaluated relaxation frequency.We demonstrate this fabrication process and the fundamental performance of the packaged laser. These lasershave great potential for use in wavelength-specified, wavelength-stabilized, high-power, low-noise, andlow chirping WDM transmitters.