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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 1 — Jan. 4, 2010
  • pp: 96–101

Vertical p-i-n germanium photodetector with high external responsivity integrated with large core Si waveguides

Ning-Ning Feng, Po Dong, Dawei Zheng, Shirong Liao, Hong Liang, Roshanak Shafiiha, Dazeng Feng, Guoliang Li, John E. Cunningham, Ashok V. Krishnamoorthy, and Mehdi Asghari  »View Author Affiliations

Optics Express, Vol. 18, Issue 1, pp. 96-101 (2010)

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We report a vertical p-i-n thin-film germanium photodetector integrated on 3μm thick large core silicon-on-insulator (SOI) waveguides. The device demonstrates very high external responsivity due to the low fiber coupling loss to the large core waveguides. The germanium width and thickness are carefully designed to achieve high responsivity yet retain high-speed performance. Even with fiber coupling loss included, the device has demonstrated greater than 0.7A/W external responsivity at 1550nm for TM polarization and 0.5A/W for TE polarization. A low dark current of 0.2μA at −0.5V bias is reported. 3dB bandwidths of 12GHz and 8.3GHz at −2.5V bias are also reported for 100μm and 200μm long devices, respectively. The device can cover the communication wavelength spectrum up to 1620nm with a relatively flat responsivity of >0.5A/W. Further studies suggest that with a modified design the device is capable of achieving 1A/W external responsivity for both TE and TM polarizations and greater than 30GHz bandwidth.

© 2009 OSA

OCIS Codes
(130.0250) Integrated optics : Optoelectronics
(130.3120) Integrated optics : Integrated optics devices
(200.4650) Optics in computing : Optical interconnects
(230.5160) Optical devices : Photodetectors

ToC Category:
Integrated Optics

Original Manuscript: November 12, 2009
Revised Manuscript: December 17, 2009
Manuscript Accepted: December 17, 2009
Published: December 22, 2009

Ning-Ning Feng, Po Dong, Dawei Zheng, Shirong Liao, Hong Liang, Roshanak Shafiiha, Dazeng Feng, Guoliang Li, John E. Cunningham, Ashok V. Krishnamoorthy, and Mehdi Asghari, "Vertical p-i-n germanium photodetector with high external responsivity integrated with large core Si waveguides," Opt. Express 18, 96-101 (2010)

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