Restriction of shot noise and material noise in a multilevel photochromic memory on signal-to-noise
ratio |
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| Authors: | Zhang Qi-Cheng Ni Yi Xu Duan-Yi and Hu Heng |
| |
| Affiliation: | Department of Precision Instrument and Mechanology, Tsinghua University, Beijing 100084, China |
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| 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. |
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| Keywords: | photochromic memory multilevel recording bandwidth of system |
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