The Write Laser Power Variation Contribution To Write Noise In MO Media

Signal-to-Noise-Ratio (SNR) is an important indicator of performance in information storage systems. There are many components of noise in magneto-optical (MO) systems. Write noise, the additional noise created by writing on MO media, is an important element the total noise. Recently, several analytical models of write noise [1] were developed based on the assumption that it is caused by the variation in mark edge placement. The edge shift contribution to write noise has two components, an intrinsic media component, and a component caused by the variation in the write laser power. In this paper, power spectral density is used to "e the contribution of write laser power variation to total noise. The power spectrum is used to estimate the write laser power variation.