Complex-plane description of differential phase detection in optical data storage

R. S. Upton, T. D. Milster

Research output: Contribution to journalConference articlepeer-review

5 Scopus citations


Differential phase detection (DPD) is a method of generating a tracking error signal from rotation of the irradiance pattern formed in the pupil of an optical data storage system. The amount of rotation is related to the distance between the scanning spot and the center of the track being scanned. Media parameters, such as reflectivities of the marks and land and the groove depth affect the DPD signal. The representation of mark and land reflectivity vectors on a complex plane diagram proves to be an elegant technique for designers to optimize a given medium for DPD.

Original languageEnglish (US)
Pages (from-to)263-271
Number of pages9
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 1998
EventOptical Data Storage 1998 - Aspen, CO, United States
Duration: May 10 1998May 13 1998


  • Babinet's principle
  • Differential phase detection
  • Optical data storage
  • Quadrant pupil detection
  • Tracking error signal

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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