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Proceedings Paper

Dead-time effects on geiger-mode APD performance
Author(s): Phillip Gatt; Steven Johnson; Terry Nichols
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Paper Abstract

Geiger mode avalanche photodiodes (GAPDs) are capable of detecting single photon events. However, once triggered, GAPDs must be reset or rearmed to enable the detection of another event. Thus, these devices are non-linear and their performance depends on the reset-time a.k.a. dead-time. In this paper, the performance of GAPD based ladar receivers is investigated and a theory for the signal photon detection efficiency (SPDE) is developed as a function of the dead-time; signal, noise and clutter flux; and the GAPD's photon detection efficiency or PDE. This SPDE theory is valid for arbitrary (short to long) dead-times. With a zero dead-time, GAPDs behave linearly and the SPDE theory converges to the PDE. For long dead-times, compared to the acquisition gate time, the theory converges to previously published works of Fouche and Williams. This SPDE theory is then applied to develop a theory for the detector signal-to-noise ratio (SNR). The performance improvement when multiple micro-pixels are grouped to form a macro pixel is also discussed.

Paper Details

Date Published: 4 May 2007
PDF: 12 pages
Proc. SPIE 6550, Laser Radar Technology and Applications XII, 65500I (4 May 2007); doi: 10.1117/12.724773
Show Author Affiliations
Phillip Gatt, Lockheed Martin Coherent Technologies (United States)
Steven Johnson, Lockheed Martin Coherent Technologies (United States)
Terry Nichols, Lockheed Martin Coherent Technologies (United States)

Published in SPIE Proceedings Vol. 6550:
Laser Radar Technology and Applications XII
Monte D. Turner; Gary W. Kamerman, Editor(s)

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