Optical head with coaxial dual-beam cross talk canceller

Kenichi Kasazumi; Kazuhisa Yamamoto; Makoto Kato

doi:10.1117/12.997599

28 June 1999 An optical head with coaxial dual-beam cross talk canceller

Kenichi Kasazumi, Kazuhisa Yamamoto, Makoto Kato

Proceedings Volume 3864, Joint International Symposium on Optical Memory and Optical Data Storage 1999; 38640D (1999) https://doi.org/10.1117/12.997599
Event: Optical Data Storage, 1999, Kauai, HI, United States

Abstract

A type of optical head with crosstalk canceller (CTC)[1] investigated so far increased considerably the storage density of the optical disks. This type of the CTC, however, required off-axis beams to detect signals from adjacent tracks, and also additional electronics to compensate for time delay between the main-beam and the sub-beams. Such beam separation caused the system unstable, because the delay time fluctuates due to the change in the wavelength, and also because the decentering of the disk resulted radial positioning error of sub-beams. To overcome these problems, we have proposed a new typed crosstalk canceller using coaxial dual beams which are orthogonally polarized[2.] In this paper, we demonstrate a practical configuration of an optical head with the CTC, and some experimental results with play back characteristics.

Citation Download Citation

Kenichi Kasazumi, Kazuhisa Yamamoto, and Makoto Kato "An optical head with coaxial dual-beam cross talk canceller", Proc. SPIE 3864, Joint International Symposium on Optical Memory and Optical Data Storage 1999, 38640D (28 June 1999); https://doi.org/10.1117/12.997599

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