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Sources of noise in erasable optical disk data storage

机译：可擦除光盘数据存储中的噪声源

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摘要

Noise sources in the readback signal for phase-change and magneto-optical disks at red, green, and blue wavelengths are examined, and a simple model is presented to explain the observed noise spectra. For phase-change disks the media noise, which corresponds to ～0.4% fluctuation in the disk's amplitude reflection coefficient, is the limiting performance factor for the conventional detection scheme. In magneto-optical media the depolarization noise, whose fluctuations are ～0.05% of the disk's reflection coefficient, is the major contributor to the media noise in the differential detection scheme. In phase-change optical disks the main sources of noise are the roughness of the groove profiles and the graininess of the polycrystalline recording layer. In nongrooved regions of the disk the media noise measured with green light is found to be nearly the same as that obtained with the red light. In magneto-optical disks the scattering of light from the rough groove profiles, as well as media inhomogeneities, gives rise to depolarization. Measurements on nongrooved regions of a magneto-optical disk indicate that the media noise obtained with the green light is somewhat higher than that obtained with the red light.
机译：检查了相变和磁光盘在红色，绿色和蓝色波长下的回读信号中的噪声源，并提出了一个简单的模型来解释观察到的噪声谱。对于相变磁盘，介质噪声（相当于磁盘振幅反射系数的〜0.4％波动）是常规检测方案的限制性能因素。在磁光介质中，去极化噪声（其波动约为磁盘反射系数的0.05％）是差分检测方案中引起介质噪声的主要因素。在相变光盘中，噪声的主要来源是凹槽轮廓的粗糙度和多晶记录层的颗粒性。在磁盘的非开槽区域中，发现绿光测量的介质噪声与红光测量的介质噪声几乎相同。在磁光盘中，来自粗糙凹槽轮廓的光的散射以及介质的不均匀性导致了去极化。在磁光盘的非开槽区域上的测量表明，绿光获得的介质噪声比红光获得的介质噪声要高一些。

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