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Proceedings Paper

32 x 16 CMOS smart pixel array for optical interconnects
Author(s): Jongwoo Kim; Peter S. Guilfoyle; Richard V. Stone; John M. Hessenbruch; Kent D. Choquette; Fouad E. Kiamilev
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Paper Abstract

Free space optical interconnects can increase throughput capacities and eliminate much of the energy consumption required for `all electronic' systems. High speed optical interconnects can be achieved by integrating optoelectronic devices with conventional electronics. Smart pixel arrays have been developed which use optical interconnects. An individual smart pixel cell is composed of a vertical cavity surface emitting laser (VCSEL), a photodetector, an optical receiver, a laser driver, and digital logic circuitry. Oxide-confined VCSELs are being developed to operate at 850 nm with a threshold current of approximately 1 mA. Multiple quantum well photodetectors are being fabricated from AlGaAs for use with the 850 nm VCSELs. The VCSELs and photodetectors are being integrated with complementary metal oxide semiconductor (CMOS) circuitry using flip-chip bonding. CMOS circuitry is being integrated with a 32 X 16 smart pixel array. The 512 smart pixels are serially linked. Thus, an entire data stream may be clocked through the chip and output electrically by the last pixel. Electrical testing is being performed on the CMOS smart pixel array. Using an on-chip pseudo random number generator, a digital data sequence was cycled through the chip verifying operation of the digital circuitry. Although, the prototype chip was fabricated in 1.2 micrometers technology, simulations have demonstrated that the array can operate at 1 Gb/s per pixel using 0.5 micrometers technology.

Paper Details

Date Published: 24 May 2000
PDF: 4 pages
Proc. SPIE 4089, Optics in Computing 2000, (24 May 2000); doi: 10.1117/12.386895
Show Author Affiliations
Jongwoo Kim, OptiComp Corp. (United States)
Peter S. Guilfoyle, OptiComp Corp. (United States)
Richard V. Stone, OptiComp Corp. (United States)
John M. Hessenbruch, OptiComp Corp. (United States)
Kent D. Choquette, Sandia National Labs. (United States)
Fouad E. Kiamilev, Univ. of Delaware (United States)

Published in SPIE Proceedings Vol. 4089:
Optics in Computing 2000
Roger A. Lessard; Tigran V. Galstian, Editor(s)

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