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We establish a novel method of controlling the transverse modes of vertical cavity surface emitting lasers(VCSELs)to achieve 1 mW single-fundamental-mode lasing. A dielectric mode filter is installed on top of the VCSEL. The dielectric layer(SiO_2) is deposited and patterned to modify the mirror reflectivity across the oxide aperture via antiphase reflections.This mode selection is nondestructive and universally applicable for other structures under single transverse mode. Destructive etching techniques(dry/wet) or epitaxial regrowth are also not required. This method simplifies the preparation process and improves the repeatability of the device. Measurements show that under continuous-wave current injection, the side-mode suppression ratio exceeds 30 dB. 相似文献
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通过对前向功率控制参数的优化来降低掉话率,达到提升网络质量的目的,及在局部出现前向功率过载的情况下,进行分析和优化,均衡网络质量和容量. 相似文献