Title :
Carrier-to-noise ratio improvement with pulsed-laser readout on magnetically induced superresolution by center aperture detection disks
Author :
Chen, Bing-Mau ; Yang, Bor-Wen ; Wein-Kuen Kwang ; Tsung-Eong Shieh ; Shieh, Han-Ping D.
Author_Institution :
Inst. of Opt.-Electr. Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan
fDate :
9/1/1999 12:00:00 AM
Abstract :
Magnetically induced superresolution by center aperture detection (MSR-CAD) using pulsed and conventional dc schemes were applied to magneto-optical disks to quantitatively evaluate readout performances. By simulation and experiments, it was found that carrier-to-noise ratio (CNR) in the pulsed-laser readout was about 2.5 dB higher than that in the dc readout scheme at mark size of 0.35 μm or shorter. Therefore, pulsed readout is feasible to improve CNR and recording density in MSR-CAD disks
Keywords :
laser beam applications; magnetic recording noise; magneto-optical recording; optical disc storage; 0.45 mum; CNR; MSR-CAD; carrier-to-noise ratio improvement; center aperture detection disks; conventional dc schemes; dc readout scheme; magnetically induced superresolution; magneto-optical disks; mark size; pulsed-laser readout; readout performance; recording density; simulation; Apertures; Disk recording; Laser noise; Laser theory; Magnetic noise; Magnetic recording; Optical pulses; Power lasers; Signal resolution; Temperature;
Journal_Title :
Magnetics, IEEE Transactions on
