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Proceedings Paper

CMOS image sensor working as high-speed photo receivers as well as a position sensor for indoor optical wireless LAN systems
Author(s): Keiichiro Kagawa; Tomohiro Nishimura; Hiroaki Asazu; Tomoaki Kawakami; Jun Ohta; Masahiro Nunoshita; Yasushi Yamasaki; Kunihiro Watanabe
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Paper Abstract

We propose and demonstrate a new image sensor specialized in an optical wireless LAN (local area network) system. The use of the image sensor brings excellent features to the optical wireless LAN systems; because the image sensor can capture the scene around the communication node or the hub at once like ordinary image sensors, it is easy to implement detection and tracing of the nodes or the hub without any mechanical component to search them. In addition, the image sensors inherently catch the multiple optical signals in parallel by a huge amount of micro photodiodes, which means that they have potentiality of concurrent data acquisition from multiple nodes at the hub. In this paper, we describe a pixel structure to implement two functional modes: a communication (COM) mode to receive temporally modulated optical signals and an image sensor (IS) mode to capture an image in which photodiode operates in an integration mode. The pixel is a fusion of an active pixel sensor and a current amplifier without temporal integration. We fabricated an 8×8-pixel image sensor in a standard 0.8μm BiCMOS technology, and successfully demonstrated position detection of a light source and acquisition of optical serial data when wavelength and frequency of incident optical data were 830nm and 1MHz, respectively. We also show the design of a 50×50-pixel CMOS image sensor with 3-stage main amplifiers.

Paper Details

Date Published: 16 May 2003
PDF: 8 pages
Proc. SPIE 5017, Sensors and Camera Systems for Scientific, Industrial, and Digital Photography Applications IV, (16 May 2003); doi: 10.1117/12.476785
Show Author Affiliations
Keiichiro Kagawa, Nara Institute of Science and Technology (Japan)
Tomohiro Nishimura, Nara Institute of Science and Technology (Japan)
Hiroaki Asazu, Nara Institute of Science and Technology (Japan)
Tomoaki Kawakami, Nara Institute of Science and Technology (Japan)
Jun Ohta, Nara Institute of Science and Technology (Japan)
Masahiro Nunoshita, Nara Institute of Science and Technology (Japan)
Yasushi Yamasaki, Microsignal Co., Ltd. (Japan)
Kunihiro Watanabe, Microsignal Co., Ltd. (Japan)


Published in SPIE Proceedings Vol. 5017:
Sensors and Camera Systems for Scientific, Industrial, and Digital Photography Applications IV
Nitin Sampat; Ricardo J. Motta; Morley M. Blouke; Nitin Sampat; Ricardo J. Motta, Editor(s)

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