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Proceedings Paper

Effect of carrier drift on the characteristics of 1.55-um traveling-wave ridge-coplanar waveguide photodetector
Author(s): Jeong-Hoon Lee; Soon-Chel Kong; Seung-Jin Lee; Young-Wan Choi
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Paper Abstract

Bandwidth of traveling-wave photodetectors is limited not only by the optical absorption coefficient and the velocity mismatches, but also by the drift time of photo-generated carriers in the i-layer. The bandwidth limitation effect of the optical absorption coefficient and the velocity mismatches have already been considered and analyzed by presenting the velocity-mismatch impulse response. In this paper, we present a modified velocity-mismatch impulse response considering the effect of the transit time. The modified impulse response is modeled by the optical waveguide analysis and the segmentation of i-layer. The frequency impulse response is also obtained by the FFT of the modified impulse response. It is found that bandwidth limitation effect of the transit time is more serious than the effect of velocity mismatch, especially at high frequency.

Paper Details

Date Published: 13 April 2000
PDF: 9 pages
Proc. SPIE 3948, Photodetectors: Materials and Devices V, (13 April 2000); doi: 10.1117/12.382119
Show Author Affiliations
Jeong-Hoon Lee, Chung-Ang Univ. (South Korea)
Soon-Chel Kong, Chung-Ang Univ. (South Korea)
Seung-Jin Lee, Chung-Ang Univ. (South Korea)
Young-Wan Choi, Chung-Ang Univ. (South Korea)

Published in SPIE Proceedings Vol. 3948:
Photodetectors: Materials and Devices V
Gail J. Brown; Manijeh Razeghi, Editor(s)

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