4-level run-length limited optical storage on photo-chromic materials

Heng Hu; Longfa Pan; Hua Hu; Duanyi Xu

doi:10.1117/12.649644

15 September 2005 4-level run-length limited optical storage on photo-chromic materials

Heng Hu, Longfa Pan, Hua Hu, Duanyi Xu

Proceedings Volume 5966, Seventh International Symposium on Optical Storage (ISOS 2005); 59660Y (2005) https://doi.org/10.1117/12.649644
Event: Seventh International Symposium on Optical Storage (ISOS 2005), 2005, Zhanjiang, China

Abstract

4-Level Run-Length Limited (4L-RLL) optical storage based on photo-chromic materials is firstly investigated in this paper to our knowledge. Unlike binary recording, information in Multi-Level Run-Length Limited (ML-RLL) modulation system is carried in both the amplitude and length of the marks. ML-RLL optical storage can increase the recording density and data transfer rate with no changes to the optical/mechanical unit. For photo-chromic materials, different levels of input laser power amplitude give rise to different reflection levels. Using optimal write strategies, a 4 level linear playback signal was obtained and the sigma-to-dynamic range (SDR) of the 4-level signal was calculated. The results show that the SDR is low enough to provide low bits error rate (BER).

Citation Download Citation

Heng Hu, Longfa Pan, Hua Hu, and Duanyi Xu "4-level run-length limited optical storage on photo-chromic materials", Proc. SPIE 5966, Seventh International Symposium on Optical Storage (ISOS 2005), 59660Y (15 September 2005); https://doi.org/10.1117/12.649644

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