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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 51, Iss. 10 — Apr. 1, 2012
  • pp: 1487–1494

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

Wei Wang, Yongqing Huang, Xiaofeng Duan, Jia Tian, Jingwei Guo, and Xiaomin Ren  »View Author Affiliations

Applied Optics, Vol. 51, Issue 10, pp. 1487-1494 (2012)

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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, 1dB linewidth of 0.5nm, 3dB linewidth of 0.8nm, 6dB linewidth of 1.2nm, peak quantum efficiency of 40%, tuning efficiency of 91mW/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

OCIS Codes
(050.2230) Diffraction and gratings : Fabry-Perot
(130.3120) Integrated optics : Integrated optics devices
(230.0250) Optical devices : Optoelectronics
(230.4170) Optical devices : Multilayers
(230.5160) Optical devices : Photodetectors

ToC Category:
Optical Devices

Original Manuscript: November 18, 2011
Revised Manuscript: December 25, 2011
Manuscript Accepted: December 27, 2011
Published: March 26, 2012

Wei Wang, Yongqing Huang, Xiaofeng Duan, Jia Tian, Jingwei Guo, and Xiaomin Ren, "Si-based tunable flattop photodetector with a stepped Fabry–Perot cavity," Appl. Opt. 51, 1487-1494 (2012)

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