Wavelength-domain tracking in multiple-beam optical storage systems

Choi, Taeyoung; Milster, Tom D.; Lang, M.

doi:10.1117/12.557068

Cited by 1 publication

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“…This has been demonstrated with three, 20 four, 21,22 and eight 23 channels to reach a sustained transfer rate of 300 Mbits͞s. Variations of the radial track pitch (so-called track squeeze) make it difficult to maintain simultaneous tracking of all channels simultaneously, so wavelength tuning of the individual lasers combined with a grating has been proposed 24 as a steering method. In all of the referenced demonstrations, however, packaging constraints and thermal cross talk in the laser array did not permit the lasers to be spaced at the track pitch, requiring the use of a tilted line of spots on the disk.…”

Section: Introductionmentioning

confidence: 99%

Acousto-Optic Parallel Read/Write Head for Optical Disk Data Storage

McLeod

Walter

2005

International Symposium on Optical Memory and Optical Data Storage

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Parallel read and write of optical disks has traditionally used a static grating for read or a linear array of independent lasers for read and write. Depending on the implementation, these systems suffer from coherent cross talk, excessive space between spots, and an inability to independently track. We show that a dynamic acousto-optic grating can generate multiple parallel read͞write spots on the disk, each of which can be independently modulated and tracked and all of which are incoherent in less that a bit period. The resulting disk pickup can potentially reach gigabit per second transfer rates with only a modest increase in the drive complexity.

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