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, $1\mathrm{dB}$ linewidth of $0.5\mathrm{nm}$, $3\mathrm{dB}$ linewidth of $0.8\mathrm{nm}$, $6\mathrm{dB}$ linewidth of $1.2\mathrm{nm}$, peak quantum efficiency of 40%, tuning efficiency of $91\mathrm{mW}/\mathrm{nm}$ are theoretically obtained. We discuss the epitaxial growth and fabrication of the photodetector in the end, exhibiting the mature technique available for this device.

© 2012 Optical Society of America

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