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光纤光栅外腔半导体激光器一般采用波导-光纤的直接耦合方式,光纤与增益芯片的耦合效率对光纤光栅外腔半导体激光器性能影响较大。为了讨论在采用不同类型光纤微透镜时对准误差对耦合效率的影响,寻找最佳微透镜类型,指导器件的设计和装配,分析了锥形和半球形光纤透镜的光线最大接收半角,利用ZEMAX软件进行模拟仿真,得到了两种光纤微透镜分别在位置误差和角度误差下的耦合效率曲线图。结果表明,锥形光纤透镜耦合效果更好,更适合应用于光纤光栅外腔半导体激光器。
Fiber grating external cavity semiconductor lasers generally use waveguide-fiber direct coupling mode, and the coupling efficiency between optical fiber and gain chip has a great influence on the performance of the fiber grating external cavity semiconductor laser. In order to discuss the effect of alignment errors on the coupling efficiency when using different types of fiber microlenses, to find the optimal microlens types, to design and assemble the guiding device, the maximum receiving half angle of light in the tapered and hemispherical fiber lenses was analyzed. The simulation results show that the coupling efficiencies of the two kinds of optical fiber microlenses are respectively in the position error and the angle error. The results show that the tapered fiber lens coupling effect is better, more suitable for fiber grating external cavity semiconductor lasers.