Thickness and refractive index of slab layer have major effects in the electro-optical characteristics of slab coupled optical waveguide diode lasers. In this research, ordinary step refractive index profile was replaced by a broadened waveguide with linear graded refractive index profile and optimized doping. The results show such design can significantly improve the power conversion efficiency (PCE). According to these results, by using the asymmetric barrier in the sides of active region, the threshold current decreases and slop efficiency (SE) increases. The PCE and SE in the proposed structure are respectively 12% and 0.21 W/A higher than those in conventional step profile.

板条层的厚度和折射率对板条耦合光波导二极管激光器的电光特性有重要影响。在这项研究中，普通阶梯折射率分布被具有线性渐变折射率分布和优化掺杂的加宽波导所取代。结果表明，这样的设计可以显着提高电源转换效率（PCE）。根据这些结果，通过在有源区的侧面使用非对称势垒，阈值电流会降低，而斜率效率 (SE) 会增加。所提出结构中的 PCE 和 SE 分别比传统阶梯剖面中的 PCE 和 SE 高 12% 和 0.21 W/A。