This paper deals with phase-change recording of EFM-modulated data according to the standard for the signals of the Compact Disc system. Application of GaSb sensitive layers allows a simple single-sided disc construction. Recording is based on locally transformation of the as-deposited amorphous state to the crystalline state.
{"title":"Write-Once Phase-Change Recording in GaSb","authors":"H. V. Tongeren, M. Sens","doi":"10.1364/ods.1987.wc3","DOIUrl":"https://doi.org/10.1364/ods.1987.wc3","url":null,"abstract":"This paper deals with phase-change recording of EFM-modulated data according to the standard for the signals of the Compact Disc system. Application of GaSb sensitive layers allows a simple single-sided disc construction. Recording is based on locally transformation of the as-deposited amorphous state to the crystalline state.","PeriodicalId":268493,"journal":{"name":"Topical Meeting on Optical Data Storage","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124151737","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 characterization of the noise processes in optical recording is very important because the ultimate recording density and system bit error rate of the medium are dependent on the signal-to-noise characteristics. The selection of the modulation and demodulation methods are driven by the medium recording and noise processes.
{"title":"A Generalized Mathematical Model of Sources of Noise Affecting Optical Recording Processes","authors":"E. LaBudde, R. LaBudde","doi":"10.1364/ods.1985.thdd1","DOIUrl":"https://doi.org/10.1364/ods.1985.thdd1","url":null,"abstract":"The characterization of the noise processes in optical recording is very important because the ultimate recording density and system bit error rate of the medium are dependent on the signal-to-noise characteristics. The selection of the modulation and demodulation methods are driven by the medium recording and noise processes.","PeriodicalId":268493,"journal":{"name":"Topical Meeting on Optical Data Storage","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122664581","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 ME write once disc developed by Plasmon Data Systems is differentiated from other optical discs by the use of a unique microstructure called Moth Eye on the disc surface. This surface structure takes its name from the fact that similar surfaces are found on the cornea of certain nocturnal insects including the night moth. The microstructure, which has a pitch significantly below the wavelength of light, acts as an impedance matching layer to reduce the surface reflection. The reduction in reflectivity can also be achieved in the case of metal and dielectric coatings on the ME surface and in this case the absorption of the film is increased.
{"title":"Plasmon Media Technology","authors":"K. Gardner, PR Helfet, RJ Longman, RM Pettigrew","doi":"10.1364/ods.1985.wdd4","DOIUrl":"https://doi.org/10.1364/ods.1985.wdd4","url":null,"abstract":"The ME write once disc developed by Plasmon Data Systems is differentiated from other optical discs by the use of a unique microstructure called Moth Eye on the disc surface. This surface structure takes its name from the fact that similar surfaces are found on the cornea of certain nocturnal insects including the night moth. The microstructure, which has a pitch significantly below the wavelength of light, acts as an impedance matching layer to reduce the surface reflection. The reduction in reflectivity can also be achieved in the case of metal and dielectric coatings on the ME surface and in this case the absorption of the film is increased.","PeriodicalId":268493,"journal":{"name":"Topical Meeting on Optical Data Storage","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121513789","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}
Optical disk drives require a radial tracking error signal to control a radial actuator. This actuator is used to follow track runout introduced by respindling the media platter and nonrepeatable spindle runout. The error signal can be optically derived by a variety of methods.1 This paper represents a method of simulating the radial error signal resulting from several different optical tracking methods as an aid to design evaluation and tolerance analysis.
{"title":"Simulation of Radial Tracking Error Signals on Optical Disk Drives","authors":"S. DeVore","doi":"10.1364/ods.1985.thbb2","DOIUrl":"https://doi.org/10.1364/ods.1985.thbb2","url":null,"abstract":"Optical disk drives require a radial tracking error signal to control a radial actuator. This actuator is used to follow track runout introduced by respindling the media platter and nonrepeatable spindle runout. The error signal can be optically derived by a variety of methods.1 This paper represents a method of simulating the radial error signal resulting from several different optical tracking methods as an aid to design evaluation and tolerance analysis.","PeriodicalId":268493,"journal":{"name":"Topical Meeting on Optical Data Storage","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125063756","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}
While most of the research on materials for reversible optical recording has been on materials using amorphous ←→ crystalline transitions or magneto-optic effects, there have been some proposals for the use of photochromic materials[1]. In this paper we present the results of a preliminary analysis of the intrinsic characteristics of photochromic materials, and the consequences of those characteristics on a bit-oriented optical memory.
{"title":"Analysis of Optical Recording on Photochromic Media","authors":"W. Tomlinson","doi":"10.1364/ods.1984.thcd3","DOIUrl":"https://doi.org/10.1364/ods.1984.thcd3","url":null,"abstract":"While most of the research on materials for reversible optical recording has been on materials using amorphous ←→ crystalline transitions or magneto-optic effects, there have been some proposals for the use of photochromic materials[1]. In this paper we present the results of a preliminary analysis of the intrinsic characteristics of photochromic materials, and the consequences of those characteristics on a bit-oriented optical memory.","PeriodicalId":268493,"journal":{"name":"Topical Meeting on Optical Data Storage","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122083423","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}
This paper presents the results of two studies on long-term readout of organic optical recording media: (a) bit error measurements from digital data tracks read 106-107 times from a rotating disk versus IR read power and (b) simulations of a very large number of readouts (108-109) using a pulsed IR read source to interrogate stationary pits. The second technique is used to provide data at a number of read cycles too time consuming for the first method, thus providing an efficient means to evaluate novel media.
{"title":"Experimental Measurements on Long-Term IR Readout of Data Recorded in Organic Optical Storage Media","authors":"D. Kay, F. Strome, J. Wrobel","doi":"10.1364/ods.1984.thcb2","DOIUrl":"https://doi.org/10.1364/ods.1984.thcb2","url":null,"abstract":"This paper presents the results of two studies on long-term readout of organic optical recording media: (a) bit error measurements from digital data tracks read 106-107 times from a rotating disk versus IR read power and (b) simulations of a very large number of readouts (108-109) using a pulsed IR read source to interrogate stationary pits. The second technique is used to provide data at a number of read cycles too time consuming for the first method, thus providing an efficient means to evaluate novel media.","PeriodicalId":268493,"journal":{"name":"Topical Meeting on Optical Data Storage","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125511834","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}
Implementation of the control systems required for the Storage Technology 7640 Optical Storage Unit consists of a combination of transducers, optical components and precision servomechanisms. The major functions include spin, focus, coarse and fine seeking, track following and write alignment systems.
{"title":"The Storage Technology 7640 Access And Control Systems*","authors":"R. P. McIntosh","doi":"10.1364/ods.1984.wcb5","DOIUrl":"https://doi.org/10.1364/ods.1984.wcb5","url":null,"abstract":"Implementation of the control systems required for the Storage Technology 7640 Optical Storage Unit consists of a combination of transducers, optical components and precision servomechanisms. The major functions include spin, focus, coarse and fine seeking, track following and write alignment systems.","PeriodicalId":268493,"journal":{"name":"Topical Meeting on Optical Data Storage","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115113126","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}
Important factors in read and write processes for magnetooptical disk are that readout carrier to noise ratio (C/N) is high, readout signal envelope is smooth,optical efficiency is high, head size is compact and head weight is light. This paper summarizes results from many studies on optical retardation influence in magneto-optical head and disk substrate. Improvements in a magneto-optical head and disk drive system are presented.
{"title":"Magneto-optical Recording Readout Performance Evaluation","authors":"T. Iwanaga, S. Sugaya, H. Inada, T. Nomura","doi":"10.1364/ods.1987.wa2","DOIUrl":"https://doi.org/10.1364/ods.1987.wa2","url":null,"abstract":"Important factors in read and write processes for magnetooptical disk are that readout carrier to noise ratio (C/N) is high, readout signal envelope is smooth,optical efficiency is high, head size is compact and head weight is light. This paper summarizes results from many studies on optical retardation influence in magneto-optical head and disk substrate. Improvements in a magneto-optical head and disk drive system are presented.","PeriodicalId":268493,"journal":{"name":"Topical Meeting on Optical Data Storage","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128881036","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 characterization of optical disk performance has evolved from video measurements of flat-field signal-to-noise ratio and video dropouts to measurements of carrier-to-noise ratio (in a 30 kHz bandwidth) and bit error rate. Although these measurements are useful, they do not present a complete picture of system performance. For example, the carrier-to-noise ratio does not give information about intersymbol interference, and the bit error rate does not give an indication of how close to failure the system may be, i.e., how much phase margin remains. There exists a powerful method known as phase margin analysis that has been effectively used for the diagnosis of head-disk interfaces in magnetics technology.1 The technique essentially consists of measuring the bit error rate as a function of decoder window width relative to the bit cell. This information fully characterizes the channel performance, combining the effects of wide-band signal-to-noise ratio, intersymbol interference, and "hard" and "soft" defects in one easily read display.
{"title":"A Unified Measure of Optical Disk Performance: Phase Margin Analysis","authors":"Frederick F. Geyer","doi":"10.1364/ods.1984.wcc4","DOIUrl":"https://doi.org/10.1364/ods.1984.wcc4","url":null,"abstract":"The characterization of optical disk performance has evolved from video measurements of flat-field signal-to-noise ratio and video dropouts to measurements of carrier-to-noise ratio (in a 30 kHz bandwidth) and bit error rate. Although these measurements are useful, they do not present a complete picture of system performance. For example, the carrier-to-noise ratio does not give information about intersymbol interference, and the bit error rate does not give an indication of how close to failure the system may be, i.e., how much phase margin remains. There exists a powerful method known as phase margin analysis that has been effectively used for the diagnosis of head-disk interfaces in magnetics technology.1 The technique essentially consists of measuring the bit error rate as a function of decoder window width relative to the bit cell. This information fully characterizes the channel performance, combining the effects of wide-band signal-to-noise ratio, intersymbol interference, and \"hard\" and \"soft\" defects in one easily read display.","PeriodicalId":268493,"journal":{"name":"Topical Meeting on Optical Data Storage","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129793200","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}
Modulation codes are used in disc memory applications to limit the distance between transitions, control the spectral distribution of the data stream, and to maximize the data capacity. Because of their high density ratios the class of codes known as Run Length Limited (RLL) codes have become dominant in the magnetic disc recording industry.
{"title":"Charge Constrained (1,7) Code For Magneto Optic Recording","authors":"Charles E. Shinn","doi":"10.1364/ods.1987.thb4","DOIUrl":"https://doi.org/10.1364/ods.1987.thb4","url":null,"abstract":"Modulation codes are used in disc memory applications to limit the distance between transitions, control the spectral distribution of the data stream, and to maximize the data capacity. Because of their high density ratios the class of codes known as Run Length Limited (RLL) codes have become dominant in the magnetic disc recording industry.","PeriodicalId":268493,"journal":{"name":"Topical Meeting on Optical Data Storage","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133466010","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：