1 May 2005 Wavelength-domain tracking in multiple-beam optical storage systems
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Optical Engineering, 44(5), 055201 (2005). doi:10.1117/1.1901656
Abstract
Wavelength-domain tracking (WDT) is a new concept for application in multiple-beam optical storage systems. Tracking errors caused by use of multiple beams on curved tracks are avoided in WDT systems by optimizing separations of focused beam spots. The control of beam spot separations is accomplished by wavelength tuning of individual laser sources. Feasibility of WDT is demonstrated by implementation and testing of a single-beam WDT tracking servo. Also, a novel method of error signal extraction by low-frequency modulation is proposed.
Taeyoung Choi, Thomas D. Milster, Matthew J. Lang, "Wavelength-domain tracking in multiple-beam optical storage systems," Optical Engineering 44(5), 055201 (1 May 2005). http://dx.doi.org/10.1117/1.1901656
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KEYWORDS
Servomechanisms

Optical tracking

Diffraction gratings

Wavelength tuning

Signal detection

Sensors

Modulation

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