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DESIGN AND ANALYSIS OF A 32X32-BIT DATABASE FILTER CHIP BASED ON A CMOS COMPATIBLE PHOTONIC VLSI DEVICE TECHNOLOGY

by TANG, JIANJING

Abstract (Summary)
With the continued expansion of electronic information resources, storage capacity requirements are expected to exceed the petabit level for large database and data warehouse systems. Along with the increasing reliance on large capacity memory systems, there will be a demand for more efficient memory access technology. While considerable effort has been devoted toward the development of optical volumetric storage media to meet the growing demand for archival data storage, relatively little work has been done to explore the technological barriers associated with providing page-oriented access to these memory devices. To address this problem in database systems, the concept of a database filter has been suggested. A database filter serves as an interface between a large volume page-oriented optical storage device and an electronic host computer. Based on a smart pixel strategy, the filter performs optical-to-electrical data conversion, processes database query operations and only passes the data matching a query to the host computer. The database filter can offset the bandwidth mismatch without loss of valid data or significant delay in data access. CMOS compatible photonic VLSI device technology is able to provide large photodetector arrays and significant logic complexity. In the dissertation research, the prototype of a 32x32-bit optoelectronic database filter chip has been implemented using a 0.35-micron CMOS technology. The filter monolithically integrates all necessary optoelectronic and logic components, including photodetectors/receivers, data manipulation logic, data queue, filter control circuitry, and interface to the host computer, into a single CMOS chip. The integration will significantly reduce the optical system complexity and yield a compact and robust read head. Queueing theory is used to analyze the performance enhancement introduced by the database filter. It is shown that even with the limitation of finite queue capacity, a database filter could be controlled to work at near optimal performance where the database search time is limited by the data transfer rate going into the host computer. Since only valid search data is passed through to the host computer, the introduction of a database filter can dramatically reduce the database search time.
Bibliographical Information:

Advisor:

School:University of Cincinnati

School Location:USA - Ohio

Source Type:Master's Thesis

Keywords:database processing optical storage interfaces optoelectronics photonic vlsi smart pixel

ISBN:

Date of Publication:01/01/2003

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