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Tutorial on basic optical data storage-3

Tutorial on basic optical data storage-3 - 1 ODS Tutorial...

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Unformatted text preview: 1 ODS Tutorial Prof. Tom D. Milster College of Optical Sciences University of Arizona Tucson, Arizona 85721 Milster: Optical Data Storage 1 [email protected] (520) 621-8280; (520) 621-4358 FAX http://www.optics.arizona.edu/milster • History and Introduction Outline • Servo Technologies • Reading Data • Inside a CD-DVD Player Milster: Optical Data Storage 2 2 Data Storage: History The Inspiration and Invention ! SEM photo by Prof. G. Möllenstedt and R Speidel and R. Speidel. ! Inspiration for David Paul Gregg’s invention of the Video Disk in 1958. ! Lines in the green box are 30 nm wide and 90 nm apart. ! This performance not yet realized in ‘air’. spot size ~ 30 nm Milster: Optical Data Storage 3 Areal density ~ 1Tb/in 2 (Library of Congress [Y 2000] printed text ~ 20 TB = 1 LOC) (Library of Congress [Y 2000] total data ~ 3 PB = 3,000 TB) 110010010111010101010 input data stream current drive signal Recording Data on an Optical Disk 110010010111010101010 Encoder/ modulator laser source illumination optics storage intense light newly written data Milster: Optical Data Storage 4 medium intense light beam (half angle = ! ) scan spot ! 3 laser source (low and constant power level) servo/data 110010010111010101010 output data stream Reading Data From an Optical Disk illumination optics storage beam splitter reflected light optics detectors...
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Tutorial on basic optical data storage-3 - 1 ODS Tutorial...

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