Wavelength-domain tracking in multiple-beam optical storage systems

Taeyoung Choi, Tom D. Milster, Matthew Lang

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish (US)
Pages (from-to)1-9
Number of pages9
JournalOptical Engineering
Issue number5
StatePublished - May 2005


  • Blazed grating
  • External cavity diode laser
  • Multiple-beam lasers
  • Optical data storage
  • Tracking error signal
  • Wavelength-domain tracking

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • General Engineering


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