中文摘要：

报道并制备一种脊波导结构的大功率1．5μm分布反馈（DFB）激光器。为了获取最大的激光器出光功率，采用上下限制层非对称的波导结构。通过模拟仿真发现，当下限制层选择为450nm时，该激光器具有最小的内部损耗系数，同时还能保证一阶模（m=1）在量子阱区具有最小的限制因子。实际制备的管芯的损耗系数为9．78cm^-1，这与仿真中计算的损耗系数9．3cm^-1较为符合。600mA直流电流下，制备的法布里-帕罗（F-P）腔激光器最大功率大于114mW；255mA直流电流下，制备的单波长DFB激光器具有45dB的边模抑制比，40mW输出功率，和小于400kHz的光谱线宽。

英文摘要：

We have prepared a ridge waveguide distributed feedback （DFB） laser emitting at 1.5 μm. To gain maximum output power of the laser, we choose asymmetric cladding layer structure. By simulation, it is found that while the lower cladding is 450 nm, the laser has minimum inner loose coefficient, and first order mode （m = 1） can has minimum limiting factor. The loose coefficient of prepared tube core is 9.78 cm^-1 , which matches well with the loose coefficient of simulation 9.3 cm 1. Under the direct current of 600 mA, the maximum power of prepared Fabry-Perot （F-P） cavity laser is greater than 114mW. Under the direct current of 225 mA, the prepared DFB laser with single-wavelength has side-mode suppression ratio of 45dB, output power of 40 mW and spectrum line width smaller than 400 kHz.