A complete study of differential wax-wane focus servo technique

M. S. Wang, T. D. Milster

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We concentrate on differential wax-wane focus servo technique' that is insensitive to many of the errors found in other schemes. Servo optics are illustrated in Figure 1. The beam reflected from optical disk is focused by the detector lens onto two detectors, detector 1 is slightly inside focus, and detector 2 is slightly beyond focus. The quad detector is offset from the center of the beam to give the FES algebra, where a is an electronic gain factor that can be any number larger than one. We used scalar diffracton model to study its performance. We studied beam propagation in the optical system, the focus error signal, the detector alignment tolerance, the tracking error signal and crosstalk. The effect of aberration on the above parameters is modeled in detailed. The differential wax-wane technique has several advantages over a single wax-wane focus servo technique. The gain is two times higher, the lock-on-range is better defied, and the linearity is ten times better in terms of RMS deviation. It is also insensitive to track rotation and disk tilt.

Original languageEnglish (US)
Title of host publicationConference Digest - Joint International Symposium on Optical Memory and Optical Data Storage, OMODS 1993
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages157-158
Number of pages2
ISBN (Electronic)0780312864, 9780780312869
DOIs
StatePublished - 1993
Event1993 Joint International Symposium on Optical Memory and Optical Data Storage, OMODS 1993 - Maui, United States
Duration: Jul 5 1993Jul 9 1993

Publication series

NameConference Digest - Joint International Symposium on Optical Memory and Optical Data Storage, OMODS 1993

Conference

Conference1993 Joint International Symposium on Optical Memory and Optical Data Storage, OMODS 1993
CountryUnited States
CityMaui
Period7/5/937/9/93

ASJC Scopus subject areas

  • Hardware and Architecture
  • Atomic and Molecular Physics, and Optics
  • Electronic, Optical and Magnetic Materials

Fingerprint Dive into the research topics of 'A complete study of differential wax-wane focus servo technique'. Together they form a unique fingerprint.

  • Cite this

    Wang, M. S., & Milster, T. D. (1993). A complete study of differential wax-wane focus servo technique. In Conference Digest - Joint International Symposium on Optical Memory and Optical Data Storage, OMODS 1993 (pp. 157-158). [696768] (Conference Digest - Joint International Symposium on Optical Memory and Optical Data Storage, OMODS 1993). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/OMODS.1993.696768