Si-based tunable flattop photodetector with a stepped Fabry-Perot cavity

This paper presents the design and analysis of a Si-based tunable flattop photodetector realized by the introduction of a stepped Fabry-Perot cavity, which can be thermally tuned via applying tuning power on its tuning electrode. By using a transfer matrix method, the spectral response of the photod...

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Bibliographic Details
Published in:Applied optics (2004) 2012-04, Vol.51 (10), p.1487-1494
Main Authors: Wang, Wei, Huang, Yongqing, Duan, Xiaofeng, Tian, Jia, Guo, Jingwei, Ren, Xiaomin
Format: Article
Language:English
Subjects:
Design engineering
Devices
Fabry-Perot
Holes
Noise levels
Photodetectors
Stepped
Tuning
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Summary:This paper presents the design and analysis of a Si-based tunable flattop photodetector realized by the introduction of a stepped Fabry-Perot cavity, which can be thermally tuned via applying tuning power on its tuning electrode. By using a transfer matrix method, the spectral response of the photodetector is simulated in detail, indicating a flattop line shape can be achieved with an optimum step height. A trade-off residing in this device between the free spectrum range and the ease of fabrication of step height is also revealed and analyzed. In the final design of the photodetector, 1 dB linewidth of 0.5 nm, 3 dB linewidth of 0.8 nm, 6 dB linewidth of 1.2 nm, peak quantum efficiency of 40%, tuning efficiency of 91 mW/nm are theoretically obtained. We discuss the epitaxial growth and fabrication of the photodetector in the end, exhibiting the mature technique available for this device.
ISSN:1559-128X
2155-3165
DOI:10.1364/AO.51.001487