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Proceedings Paper

Design considerations for high-speed low-noise avalanche photodiodes
Author(s): Beng Koon Ng; Jo Shien Ng; Paul J. Hambleton; John P. R. David; D. S. Ong; Graham J. Rees; Richard C. Tozer
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Paper Abstract

Realization of high-speed avalanche photodiodes (APDs) requires the use of thin avalanche regions to reduce carrier transit time. A systematic investigation on the effect of dead space on the current impulse response and bandwidth of short APDs was carried out using a random path length model assuming a constant carrier velocity. The results indicate that, although dead space suppresses large multiplication values in a short device to give low excess noise, the number of impact ionization a carrier can undergo in a single transit is reduced. Consequently, multiple carrier feedback processes are necessary to achieve a given multiplication value. This results in an increase in the response time and reduces the bandwidth of short APDs. Conventional local models that take no account of the dead space effect will tend to overestimate the operating speed of these devices.

Paper Details

Date Published: 29 October 2001
PDF: 9 pages
Proc. SPIE 4594, Design, Fabrication, and Characterization of Photonic Devices II, (29 October 2001); doi: 10.1117/12.446539
Show Author Affiliations
Beng Koon Ng, Univ. of Sheffield (United Kingdom)
Jo Shien Ng, Univ. of Sheffield (United Kingdom)
Paul J. Hambleton, Univ. of Sheffield (United Kingdom)
John P. R. David, Univ. of Sheffield (United Kingdom)
D. S. Ong, Multimedia Univ. (Malaysia)
Graham J. Rees, Univ. of Sheffield (United Kingdom)
Richard C. Tozer, Univ. of Sheffield (United Kingdom)


Published in SPIE Proceedings Vol. 4594:
Design, Fabrication, and Characterization of Photonic Devices II

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