Abstract
Wavelength-domain tracking 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 language | English (US) |
|---|---|
| Pages (from-to) | 197-208 |
| Number of pages | 12 |
| Journal | Proceedings of SPIE - The International Society for Optical Engineering |
| Volume | 5380 |
| DOIs | |
| State | Published - 2004 |
| Event | Optical Data Storage 2004 - Monterey, CA, United States Duration: Apr 18 2004 → Apr 21 2004 |
Keywords
- Blazed grating
- External cavity diode laser (ECDL)
- Multiple-beam lasers
- Optical data storage
- Tracking error signal (TES)
- Wavelength-domain tracking (WDT)
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Computer Science Applications
- Applied Mathematics
- Electrical and Electronic Engineering