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Proceedings Paper

CMOS photodetectors/receivers for smart-pixel based photonic systems
Author(s): Jianjing Tang; Sunil Konanki; Bharath Seshadri; Boon Kwee Lee; Robert C. J. Chi; Andrew J. Steckl; Fred Richard Beyette Jr.
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Paper Abstract

The design, characterization and evaluation of CMOS based silicon photodetectors/photoreceivers suitable for smart-pixel based applications are presented. Implemented with a conventional CMOS fabrication process, these photodetectors/receiver circuits can be reliably fabricated for smart-pixel based photonic information processing systems that combine the parallelism associated with optics and the data processing capabilities associated with CMOS logic. Several different CMOS based photodetector structures including p-n junction detectors and bipolar phototransistors are presented. Simulation results indicate that the p-n junction detectors will provide photocurrents in the range of nanoamps with rise/fall times on the order of picoseconds. Although slower response is expected with the phototransistor structure, the optoelectronic gain increases the photocurrent to the microamps range. In addition to fabrication and evaluation of individual photodetectors, we present the design and evaluation of high gain photoreceiver array. Based on a standard 1.2 micrometer CMOS fabrication process the monolithic photodetector/receiver circuit includes a bipolar phototransistor, a three-stage current amplifier and a differential amplifier that produces output at digital logic levels. The photoreceiver with high gain and adjustable threshold has a wide dynamic range. For a reference voltage of 3.2 V, the optical power threshold has been measured at less than 1 nW. A page-oriented optical data detection is demonstrated using a 5 X 5 smart-pixel photoreceiver array.

Paper Details

Date Published: 17 November 2000
PDF: 8 pages
Proc. SPIE 4109, Critical Technologies for the Future of Computing, (17 November 2000); doi: 10.1117/12.409206
Show Author Affiliations
Jianjing Tang, Univ. of Cincinnati (United States)
Sunil Konanki, Univ. of Cincinnati (United States)
Bharath Seshadri, Univ. of Cincinnati (United States)
Boon Kwee Lee, Univ. of Cincinnati (United States)
Robert C. J. Chi, Univ. of Cincinnati (United States)
Andrew J. Steckl, Univ. of Cincinnati (United States)
Fred Richard Beyette Jr., Univ. of Cincinnati (United States)

Published in SPIE Proceedings Vol. 4109:
Critical Technologies for the Future of Computing
Sunny Bains; Leo J. Irakliotis, Editor(s)

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