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Optical information storage and recovery
Published in John P. Dakin, Robert G. W. Brown, Handbook of Optoelectronics, 2017
Optical data storage has a long history dating back to the 1960s but, with the compact disk initially, it became relevant to the consumer and industry. The success of the early laser disk indicated the possibility of data storage based on optical phenomena and materials as an alternative to magnetic storage. Optical storage offers reliable and removable storage media with excellent robustness and archival lifetime and very low cost. Today, optical disk technology covers a wide variety of applications ranging from content distribution to professional storage applications. One of the major application areas for optical storage disks is the secondary storage of computer data in personal computers (PCs) and computer networks. An optical storage system is a particularly attractive component of the data storage network because it provides fast data access times and fair storage capacities while serving as a link between different multimedia and computerized systems. Perhaps, the most enabling feature of optical storage is the removability of the storage medium that allows transportation and exchange of the stored information between desktop and laptop computers, audio, video players, and recorders. In contrast to the flying head of a hard disk drive, there are separations of a few millimeters between the recording surface and the optical “head,” although active servo systems enable dynamic recording and readout from a rotating disk. Consequently, the medium can be removed and replaced with relatively loose tolerances allowing an optical disk to be handled in different drives.
Communication in the Modern Age
Published in Michael M. A. Mirabito, Barbara L. Morgenstern, Mitchell Kapor, The New Communications Technologies, 2004
Michael M. A. Mirabito, Barbara L. Morgenstern, Mitchell Kapor
The communications system is also quite flexible in the representation of information. For example, in a fiber-optic system, light conveys information. In optical storage media (such as CDs and DVDs), a laser’s light is used to retrieve information. We’ll cover these topics in Chapters 5 and 9, respectively.
Review of Digital Electronics Design
Published in Suman Lata Tripathi, Sobhit Saxena, Sushanta Kumar Mohapatra, Advanced VLSI Design and Testability Issues, 2020
Reena Chandel, Dushyant Kumar Singh, P. Raja
Optical storage devices use LASER to read and write information. Different pattern of magnetization is used to store the data on magnetizable medium. The main differences in optical and magnetic memories are tabulated in Table 2.11.
Order release in production planning and control systems: challenges and opportunities
Published in International Journal of Production Research, 2022
Depending on the complexity of the firm’s products, operations and markets, PPC encompasses a wide variety of decisions that differ greatly in the time frame covered by their decisions (their planning horizon) (minutes/hours vs. days vs. weeks vs. years), level of detail (operations vs. components vs. products vs. product families) and impact on the firm's performance. In all but the very simplest firms, the complexity of this task requires its decomposition into smaller, more manageable subtasks. How this decomposition is implemented in a given firm specifies the structure of its PPC systems. We restrict ourselves to discrete manufacturing industries such as automotive components, semiconductor devices or the production of optical storage media, where hierarchically structured PPC systems represent the dominant paradigm. In process industries such as integrated steel plants or chemical manufacturing the nature of the production technology makes it difficult to decouple planning calculations from shop-floor control, requiring PPC systems that differ significantly from those in discrete-parts manufacturing (Tang et al. 2001; Gunther and Van Beek 2003).
Aberrated moving soliton in nonlinear photonic crystal
Published in Journal of Modern Optics, 2020
A few words about the possible application of the aberrated (as well as chirped) solitons. First, such a kind of soliton can be used for all-optical data storage devices (3D or 5D optical storage devices) because, in this case, the spatial spectrum and temporal spectrum do not undergo the influence of the inhomogeneities caused by the nonlinear absorption, when data are written or when data are read. Therefore, it is possible to avoid the effect of information false writing. Second, the aberrated soliton may be used in devices of storage of optical energy because, in a computer simulation, we observe the light energy localization in the PC due to the moving aberrated soliton formation for the time interval, which exceeds the pulse duration more than 30,000 times. This value is not a limit of observation: we stop the computation. However, the soliton does not leave the PC and it will propagate so on. Moreover, one can govern the process of light energy releasing from the PC using another light pulse, which changes the ambient medium near the PC front.
Copper(I) π-coordination compounds with allyl derivatives of disubstituted pseudothiohydantoin: synthesis, structure investigation and nonlinear optical features
Published in Journal of Coordination Chemistry, 2019
Andrii A. Fedorchuk, Yurii Slyvka, Vasyl Kinzhybalo, Iwan Kityk, Jarosław Jędryka, Katarzyna Ozga, Marian Mys`kiv
The nonlinear optical (NLO) response of materials is utilized in many applications, from the optical coupling between fibers to laser light generation and modulation; it is critical to photonic computing and logic operations [1]. NLO materials, including those which are based on the effect of second (SHG) or third (THG) harmonic generation, are able to expand the frequency ranges of lasers, being the most efficient way to extend the laser wavelength range starting from the near infrared (IR) to visible and UV region at the one end of the spectrum, or to the mid- and far-IR region at the other end [2]. This is necessary to facilitate applications in a broad range of fields, such as material processing, semiconductor photolithography, optical storage, photochemical synthesis, and high-capacity communication networks [3, 4]. Recently, enhanced interest is devoted to organometallic Cu-containing complexes [5–7]. However, almost all of the earlier organometallic compounds with Cu have been studied without laser treatment which due to presence of the 3d Cu-localized states may be important here and may allow to modulate by output nonlinear optical susceptibilities.