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Proceedings Paper

High speed pin photodetector with ultrawide spectral responses
Author(s): C. Tam; C.-J. Chiang; M. Cao; M. Chen; M. Wong; A. Vazquez; J. Poon; K. Aihara; A. Chen; J. Frei; C. D. Johns; Ibrahim Kimukin; Achyut K. Dutta; M. Saif Islam
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Paper Abstract

We report the design and fabrication of a high speed surface illuminated pin photodetector with a wide spectral response. An InGaAs based detector was grown lattice matched to InP and the device was fabricated using a novel technique to facilitate the direct absorption of incoming photons in the InGaAs layer without being absorbed by any other wider bandgap material. The absorption of a wide spectrum of wavelengths was achieved by recess etching almost all of the InP contact layer above the InGaAs absorption layer of a pin photodiode subsequent to ohmic contacts formation. Theoretical simulation shows responsivities above 0.6 A/W between 900 and 1600 nm and a linear reduction to 0.3 A/W at 650 nm. This makes the detector operational in both visible and near-infrared spectrum. The responsivities are 0.50, 0.77, and 0.67 A/W for 840, 1310 and 1550 nm respectively. These values confirm the potential of the device to be effective in all of the optical fiber communication wavelengths. Our calculations also show that the device can operate above 10 GHz throughout the spectrum.

Paper Details

Date Published: 24 October 2005
PDF: 6 pages
Proc. SPIE 6014, Active and Passive Optical Components for WDM Communications V, 60140Z (24 October 2005); doi: 10.1117/12.630103
Show Author Affiliations
C. Tam, Univ. of California/Davis (United States)
C.-J. Chiang, Univ. of California/Davis (United States)
M. Cao, Univ. of California/Davis (United States)
M. Chen, Univ. of California/Davis (United States)
M. Wong, Univ. of California/Davis (United States)
A. Vazquez, Univ. of California/Davis (United States)
J. Poon, Univ. of California/Davis (United States)
K. Aihara, Univ. of California/Davis (United States)
A. Chen, Univ. of California/Davis (United States)
J. Frei, Univ. of California/Davis (United States)
C. D. Johns, Univ. of California/Davis (United States)
Ibrahim Kimukin, Univ. of California/Davis (United States)
Achyut K. Dutta, Banpil Photonics, Inc. (United States)
M. Saif Islam, Univ. of California/Davis (United States)


Published in SPIE Proceedings Vol. 6014:
Active and Passive Optical Components for WDM Communications V
Achyut K. Dutta; Yasutake Ohishi; Niloy K. Dutta; Jesper Moerk, Editor(s)

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