Analysis of wavelength-selective photodetectors based on grating-assisted forward coupling
Analysis of wavelength-selective photodetectors based on grating-assisted forward coupling
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DOI：
10.1109/50.248118
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发表时间：
1993-04
影响因子：
4.7
通讯作者：
H. Sakata
中科院分区：
文献类型：
--
作者：
H. Sakata
光栅辅助的垂直定向耦合器可以与倏逝耦合吸收层相结合，以实现集成的波长选择性光电探测器。研究了多层波导光探测器的多模结构，分析了无耗滤波器段到吸收探测器段的模式转移。通过优化器件结构，可以抑制波长的背景吸收，结果，可以获得高串扰衰减。滤波器带宽可以被设计为覆盖从10 nm量级到0.5 nm量级的宽范围，器件长度短于2 mm，这使得它适用于各种类型的波分复用系统。>
Grating-assisted vertical directional couplers can be combined with evanescently coupled absorption layers to realize integrated wavelength-selective photodetectors. The multimode structure of a photodetector including layered waveguides is studied, and mode transfer from the lossless filter section to the absorptive detector section is analyzed. By optimizing the device structure, the background absorption of unselected wavelengths can be suppressed, and, as a result, high crosstalk attenuation can be obtained. The filter bandwidth can be designed to cover a wide range from on the order of 10 nm down to the order of 0.5 nm with a device length that is shorter than 2 mm, which makes it suitable for various types of wavelength-division-multiplexing systems. >