Restriction of shot noise and material noise in a multilevel photochromic memory  on signal-to-noise
ratio

doi:10.1088/1009-1963/15/8/025

中国物理B ›› 2006, Vol. 15 ›› Issue (8): 1783-1787.doi: 10.1088/1009-1963/15/8/025

• CLASSICAL AREAS OF PHENOMENOLOGY • 上一篇下一篇

Restriction of shot noise and material noise in a multilevel photochromic memory on signal-to-noise ratio

张启程, 倪　屹, 徐端颐, 胡　恒

Department of Precision Instrument and Mechanology, Tsinghua University, Beijing 100084, China

收稿日期:2005-12-14 修回日期:2006-04-24 出版日期:2006-08-20 发布日期:2006-08-20
基金资助:
Project supported by the State Key Development Program For Basic Research of China (Grant No 19990330) and the National Natural Science Foundation of China (Grant No 60577035).

Restriction of shot noise and material noise in a multilevel photochromic memory on signal-to-noise ratio

Zhang Qi-Cheng(张启程), Ni Yi(倪屹), Xu Duan-Yi(徐端颐), and Hu Heng(胡恒)

Department of Precision Instrument and Mechanology, Tsinghua University, Beijing 100084, China

Received:2005-12-14 Revised:2006-04-24 Online:2006-08-20 Published:2006-08-20
Supported by:
Project supported by the State Key Development Program For Basic Research of China (Grant No 19990330) and the National Natural Science Foundation of China (Grant No 60577035).

摘要/Abstract

摘要： The recording density of multilevel photochromic memory is limited by the signal-to-noise ratio (SNR) of the readout signal. In this paper, shot noise and material noise are investigated through theoretical analysis of SNR. When the bandwidth of a system is less than 1MHz, the material noise takes a prominent position; when the bandwidth of the system is more than 10MHz, the shot noise becomes dominant. The thickness of recording layer can be optimized to maximize the SNR and reduce the influence of the bandwidth of the system on SNR.

Abstract: The recording density of multilevel photochromic memory is limited by the signal-to-noise ratio (SNR) of the readout signal. In this paper, shot noise and material noise are investigated through theoretical analysis of SNR. When the bandwidth of a system is less than 1MHz, the material noise takes a prominent position; when the bandwidth of the system is more than 10MHz, the shot noise becomes dominant. The thickness of recording layer can be optimized to maximize the SNR and reduce the influence of the bandwidth of the system on SNR.

Key words: photochromic memory, multilevel recording, bandwidth of system

中图分类号: (Optical storage systems, optical disks)

42.79.Vb

42.70.Ln (Holographic recording materials; optical storage media)

张启程, 倪　屹, 徐端颐, 胡　恒. Restriction of shot noise and material noise in a multilevel photochromic memory on signal-to-noise ratio[J]. 中国物理B, 2006, 15(8): 1783-1787.

Zhang Qi-Cheng(张启程), Ni Yi(倪屹), Xu Duan-Yi(徐端颐), and Hu Heng(胡恒). Restriction of shot noise and material noise in a multilevel photochromic memory on signal-to-noise ratio[J]. Chinese Physics, 2006, 15(8): 1783-1787.

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Restriction of shot noise and material noise in a multilevel photochromic memory on signal-to-noise ratio

Restriction of shot noise and material noise in a multilevel photochromic memory on signal-to-noise ratio

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