CMOS image sensor working as high-speed photo receivers as well as a position sensor for indoor optical wireless LAN systems

Keiichiro Kagawa; Tomohiro Nishimura; Hiroaki Asazu; Tomoaki Kawakami; Jun Ohta; Masahiro Nunoshita; Yasushi Yamasaki; Kunihiro Watanabe

doi:10.1117/12.476785

16 May 2003 CMOS image sensor working as high-speed photo receivers as well as a position sensor for indoor optical wireless LAN systems

Keiichiro Kagawa, Tomohiro Nishimura, Hiroaki Asazu, Tomoaki Kawakami, Jun Ohta, Masahiro Nunoshita, Yasushi Yamasaki, Kunihiro Watanabe

Author Affiliations +

Proceedings Volume 5017, Sensors and Camera Systems for Scientific, Industrial, and Digital Photography Applications IV; (2003) https://doi.org/10.1117/12.476785
Event: Electronic Imaging 2003, 2003, Santa Clara, CA, United States

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.

Citation Download Citation

Keiichiro Kagawa, Tomohiro Nishimura, Hiroaki Asazu, Tomoaki Kawakami, Jun Ohta, Masahiro Nunoshita, Yasushi Yamasaki, and Kunihiro Watanabe "CMOS image sensor working as high-speed photo receivers as well as a position sensor for indoor optical wireless LAN systems", Proc. SPIE 5017, Sensors and Camera Systems for Scientific, Industrial, and Digital Photography Applications IV, (16 May 2003); https://doi.org/10.1117/12.476785

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available