Optical write once systems store data at areal densities of 105 to 106 bits/mm2 for more than 10 to 20 years. Both drives and media have flaws, and sophisticated data integrity procedures are used to insure that recorded data can be recovered correctly. This paper discusses some of the techniques implemented in Optical Storage International's LD1200 System.
{"title":"Data Integrity in the LD1200 System","authors":"D. Lou","doi":"10.1364/ods.1987.fb4","DOIUrl":"https://doi.org/10.1364/ods.1987.fb4","url":null,"abstract":"Optical write once systems store data at areal densities of 105 to 106 bits/mm2 for more than 10 to 20 years. Both drives and media have flaws, and sophisticated data integrity procedures are used to insure that recorded data can be recovered correctly. This paper discusses some of the techniques implemented in Optical Storage International's LD1200 System.","PeriodicalId":268493,"journal":{"name":"Topical Meeting on Optical Data Storage","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116696860","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The Kodak write once optical media consists of a dye/binder, gold reflector bilayer structure on a 14" aluminum support. Excellent performance and aging characteristics have been demonstrated on pilot line production media.
{"title":"The Rigid Optical Disk Assembly by Eastman Kodak Company","authors":"Jim P. Maher","doi":"10.1364/ods.1987.tha2","DOIUrl":"https://doi.org/10.1364/ods.1987.tha2","url":null,"abstract":"The Kodak write once optical media consists of a dye/binder, gold reflector bilayer structure on a 14\" aluminum support. Excellent performance and aging characteristics have been demonstrated on pilot line production media.","PeriodicalId":268493,"journal":{"name":"Topical Meeting on Optical Data Storage","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131961506","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Single layer (≃ 300A thick) Te and Te-alloy films on polymethylmethacrylate substrates are widely studied for possible use as optical recording media. The ablative hole formation process in such media is however still poorly understood. In this paper, data is presented to show that ablative writing in Te-alloy films has two hole opening regimes. This two regime hole opening process is shown to lead to a qualitative understanding of the contrast ratio versus writing laser power characteristics of Te-alloy films.
{"title":"Two-Regime Hole Opening Process in Tellurium-Alloy Films","authors":"M. Chen, V. Marrello, U. G. Gerber","doi":"10.1364/ods.1983.wa2","DOIUrl":"https://doi.org/10.1364/ods.1983.wa2","url":null,"abstract":"Single layer (≃ 300A thick) Te and Te-alloy films on polymethylmethacrylate substrates are widely studied for possible use as optical recording media. The ablative hole formation process in such media is however still poorly understood. In this paper, data is presented to show that ablative writing in Te-alloy films has two hole opening regimes. This two regime hole opening process is shown to lead to a qualitative understanding of the contrast ratio versus writing laser power characteristics of Te-alloy films.","PeriodicalId":268493,"journal":{"name":"Topical Meeting on Optical Data Storage","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134053397","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Magnetic data disks have been widely in use in computer systems since the 1960s. During this period, the disks have become smaller is size as the density of the data on the media has increased. During the last 25 years the data density has increased from 2,000 bits per square inch (IBM 350) to an estimated 24 million bits per square inch on the recently announced models of the IBM 3380.
{"title":"Development of Optical Disk Architecture","authors":"S. Stone, E. S. Girbovan","doi":"10.1364/ods.1985.thdd4","DOIUrl":"https://doi.org/10.1364/ods.1985.thdd4","url":null,"abstract":"Magnetic data disks have been widely in use in computer systems since the 1960s. During this period, the disks have become smaller is size as the density of the data on the media has increased. During the last 25 years the data density has increased from 2,000 bits per square inch (IBM 350) to an estimated 24 million bits per square inch on the recently announced models of the IBM 3380.","PeriodicalId":268493,"journal":{"name":"Topical Meeting on Optical Data Storage","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133585519","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Generally optical discs are divided into several sectors in which an amount of data is stored. Each sector starts with a header which contains an address and synchronization information. If, because of aging of the disc, this sync-info is destroyed, one needs a backup for having access to the data in that sector. A convenient way of attaining this is to have a prerecorded clock (a depth modulation of the pregroove) in the disc. Using this clock, a defect-insensitive phase lock loop and a counter, the sync-info of previous sectors can be used to reach the data in the damaged sector.
{"title":"Read-Write Channel for Optical Recording","authors":"Hans J. Verboom, R. Bracht, C. Steenbergen","doi":"10.1364/ods.1984.wcc3","DOIUrl":"https://doi.org/10.1364/ods.1984.wcc3","url":null,"abstract":"Generally optical discs are divided into several sectors in which an amount of data is stored. Each sector starts with a header which contains an address and synchronization information. If, because of aging of the disc, this sync-info is destroyed, one needs a backup for having access to the data in that sector. A convenient way of attaining this is to have a prerecorded clock (a depth modulation of the pregroove) in the disc. Using this clock, a defect-insensitive phase lock loop and a counter, the sync-info of previous sectors can be used to reach the data in the damaged sector.","PeriodicalId":268493,"journal":{"name":"Topical Meeting on Optical Data Storage","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133226248","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Drexon recording media consists of a thin layer of silver particles on the surface of a gel substrate. A protective overcoat of laminated plastic is in contact with the recording surface. The thin layer acts as reflector and absorber of the incident light. Light transmitted through the thin film is absorbed by small particles suspended in the gel.
{"title":"Theoretical Modeling and Experimental Characterization of Drexon Recording Media","authors":"E. LaBudde, R. LaBudde, R. Hazel","doi":"10.1364/ods.1985.wdd3","DOIUrl":"https://doi.org/10.1364/ods.1985.wdd3","url":null,"abstract":"Drexon recording media consists of a thin layer of silver particles on the surface of a gel substrate. A protective overcoat of laminated plastic is in contact with the recording surface. The thin layer acts as reflector and absorber of the incident light. Light transmitted through the thin film is absorbed by small particles suspended in the gel.","PeriodicalId":268493,"journal":{"name":"Topical Meeting on Optical Data Storage","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121713757","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Many investigations have been done on the field of frequency domain optical memories based on photochemical hole burning (PHB). This effect offers an extra dimension for the organization of an optical memory. At cryogenic temperatures several solid state materials such as aggregate color centers in alkali halide crystals exhibit inhomogeneously broadened absorption lines. In such an absorption line permanent narrow holes can be burnt by photochemical processes induced by exposure to intense laser radiation with a wavelength within the inhomogeneously broadened line.
{"title":"Reading and Writing of Photochemical Holes Using GaAIAs Diode Lasers","authors":"P. Pokrowsky, W. Moerner, F. Chu, G. Bjorklund","doi":"10.1364/ods.1983.wa7","DOIUrl":"https://doi.org/10.1364/ods.1983.wa7","url":null,"abstract":"Many investigations have been done on the field of frequency domain optical memories based on photochemical hole burning (PHB). This effect offers an extra dimension for the organization of an optical memory. At cryogenic temperatures several solid state materials such as aggregate color centers in alkali halide crystals exhibit inhomogeneously broadened absorption lines. In such an absorption line permanent narrow holes can be burnt by photochemical processes induced by exposure to intense laser radiation with a wavelength within the inhomogeneously broadened line.","PeriodicalId":268493,"journal":{"name":"Topical Meeting on Optical Data Storage","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129130391","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
D. Carlin, J. Bednarz, C. Kaiser, J. Connolly, M. Harvey
We are reporting the use of a monolithic array of individually addressable diode lasers as the source for multichannel optical recording. Simultaneous recording of closely spaced tracks has been shown to be effective in achieving extremely high data rates. Such systems have, heretofore, used individually modulated beams formed by splitting the output of an argon ion laser.1 Diode lasers are the preferred source for optical recording applications2 and the use of a monolithic array of high-power, single-mode diode lasers, which can be modulated directly and independently, represents a significant advance towards the realization of compact, efficient high-performance recording systems.
{"title":"Multichannel Diode Laser Array Optical Recording","authors":"D. Carlin, J. Bednarz, C. Kaiser, J. Connolly, M. Harvey","doi":"10.1364/ods.1984.fca3","DOIUrl":"https://doi.org/10.1364/ods.1984.fca3","url":null,"abstract":"We are reporting the use of a monolithic array of individually addressable diode lasers as the source for multichannel optical recording. Simultaneous recording of closely spaced tracks has been shown to be effective in achieving extremely high data rates. Such systems have, heretofore, used individually modulated beams formed by splitting the output of an argon ion laser.1 Diode lasers are the preferred source for optical recording applications2 and the use of a monolithic array of high-power, single-mode diode lasers, which can be modulated directly and independently, represents a significant advance towards the realization of compact, efficient high-performance recording systems.","PeriodicalId":268493,"journal":{"name":"Topical Meeting on Optical Data Storage","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126460082","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
As semiconductor lasers are being used in more advanced optical systems, the noise properties of the light output are of increasing importance. We present an experimental analysis of noise due to feedback into index guided lasers. Our measurement set-up reproduces that in which the laser may be used for reading information from a mechanically unstable reflecting surface, as for example an optical disk. The analysis includes the dependence of noise on output power level, proportion of the reflected light returned to the laser, external cavity length and modulation level. Finally, the noise performance of different lasers, with and without modulation, is compared in a simple analysis of the requirements of optical disk systems.
{"title":"Noise Properties of Semiconductor Lasers in Simulated Conditions of Optical Playback","authors":"M. Small, K. Stubkjaer","doi":"10.1364/ods.1984.fca1","DOIUrl":"https://doi.org/10.1364/ods.1984.fca1","url":null,"abstract":"As semiconductor lasers are being used in more advanced optical systems, the noise properties of the light output are of increasing importance. We present an experimental analysis of noise due to feedback into index guided lasers. Our measurement set-up reproduces that in which the laser may be used for reading information from a mechanically unstable reflecting surface, as for example an optical disk. The analysis includes the dependence of noise on output power level, proportion of the reflected light returned to the laser, external cavity length and modulation level. Finally, the noise performance of different lasers, with and without modulation, is compared in a simple analysis of the requirements of optical disk systems.","PeriodicalId":268493,"journal":{"name":"Topical Meeting on Optical Data Storage","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128969591","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The operation of a Photo Elastic Modulator (PEM) type ellipsometer is described in Mueller matrix terms. The phase shift (δ) between orthogonal polarization components and the relative amplitude ratio (tan) is contained in the Mueller matrix elements and can be obtained via combinations of measured matrix elements using no mechanical motion. A phase shift measurement accuracy of ±0.2° has been obtained without calibration. The short term repeatibility of both δ and is ± 0.01°. A computer controlled implementation is described along with simple algorithms to extract the ellipsometric constants. The Mueller matrix of a magneto optic film system has been used along with one for a "leaky" beamsplitter to form the optical readout system matrix for an ideal system. One of the Stokes parameters is porportional to the differential detection signal often used in MO data detection schemes.
{"title":"Mueller Matrix Tools in Magneto Optic Data Storage Systems","authors":"B. Bell","doi":"10.1364/ods.1987.pdp1","DOIUrl":"https://doi.org/10.1364/ods.1987.pdp1","url":null,"abstract":"The operation of a Photo Elastic Modulator (PEM) type ellipsometer is described in Mueller matrix terms. The phase shift (δ) between orthogonal polarization components and the relative amplitude ratio (tan) is contained in the Mueller matrix elements and can be obtained via combinations of measured matrix elements using no mechanical motion. A phase shift measurement accuracy of ±0.2° has been obtained without calibration. The short term repeatibility of both δ and is ± 0.01°. A computer controlled implementation is described along with simple algorithms to extract the ellipsometric constants. The Mueller matrix of a magneto optic film system has been used along with one for a \"leaky\" beamsplitter to form the optical readout system matrix for an ideal system. One of the Stokes parameters is porportional to the differential detection signal often used in MO data detection schemes.","PeriodicalId":268493,"journal":{"name":"Topical Meeting on Optical Data Storage","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128988567","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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