Li Hongqiang, Ma Xiangdong, Yuan Danyang, Zhang Zanyun, Li Enbang, Tang Chunxiao
Opt Lett. 2016 Sep 15;41(18):4158-61. doi: 10.1364/OL.41.004158.
We propose a fiber Bragg grating (FBG) sensor interrogation system utilizing a III-V vertical cavity surface emitting laser (VCSEL) as the on-chip light source. Binary blazed grating (BBG) for coupling between III-V VCSEL and silicon-on-insulator (SOI) waveguides is demonstrated for interrogation of the FBG sensor. The footprint size of the BBG is only 5.62 μm×5.3 μm, and each BBG coupler period has two subperiods. The diameter of the VCSEL's emitting window is 5 μm, which is slightly smaller than that of the BBG coupler, to be well-matched with the proposed structure. Results show that the coupling efficiency from vertical cavities of the III-V VCSEL to the in-plane waveguides reached as high as 32.6% when coupling the 1550.65 nm light. The heterogeneous integration of the III-V VCSEL and SOI waveguides by BBG plays a fundamental role in inducing a great breakthrough to the miniaturization of an on-chip light source for optical fiber sensing.
我们提出了一种光纤布拉格光栅（FBG）传感器询问系统，该系统利用III-V族垂直腔面发射激光器（VCSEL）作为片上光源。展示了用于III-V族VCSEL与绝缘体上硅（SOI）波导之间耦合的二元闪耀光栅（BBG），用于FBG传感器的询问。BBG的占地面积仅为5.62μm×5.3μm，并且每个BBG耦合器周期有两个子周期。VCSEL发射窗口的直径为5μm，略小于BBG耦合器的直径，以便与所提出的结构良好匹配。结果表明，当耦合1550.65nm光时，从III-V族VCSEL的垂直腔到平面内波导的耦合效率高达32.6%。通过BBG实现的III-V族VCSEL与SOI波导的异质集成，对于实现用于光纤传感的片上光源的小型化取得重大突破起着至关重要的作用。
