报道了一种在倍增区引入AlxGa1-xAs带隙梯度结构的谐振腔增强型雪崩光探测器,并提出优化其后工艺制作的新方法。通过将Al0.4Ga0.6As(28nm)-Al0.2Ga0.8As(10nm)-GaAs(50nm)带隙梯度结引入雪崩探测器的高场区,可以实现对探测器噪声和频率响应两个主要性能的优化。数值仿真表明,该结构探测器具有较小的噪声(有效离化系数为0.1),约33GHz的3dB带宽(增益为5),在增益为15时可获得420GHz的增益带宽积。在实际的后工艺制作中,提出使用苯并环丁烯树脂进行InP/空气隙DBR反射镜与雪崩探测器结构粘合的方法,简化了工艺流程。
A novel structural design of resonant cavity enhanced avalanche photodiodes(RCE-APD),which introduces the AlxGa1-xAs bandgap graded structure into the multiplication region,and a new method for optimizing the fabrication process of RCE-APD is presented.The noise characteristics and frequency response of the avalanche photodiodes can be optimized by placing the structure of Al0.4Ga0.6As(28nm)-Al0.2Ga0.8As(10nm)-GaAs(50nm)into the high field region.Through theoretical analysis,a low noise(keff≈0.1),a bandwidth as high as 33 GHz and a record gain-bandwidth product about 420GHz(G=15)are obtained.Benzocyclobutene(BCB)is used to stick the InP/Air DBR resonant-cavity and the photo-detector together,simplifying the fabrication process.