Readout Characteristics of a Track Servo Signal by an Optically Switched Laser Diode Head

Hiroo UKITA  Yoshihiro ISOMURA  Hidenao TANAKA  

IEICE TRANSACTIONS (1976-1990)   Vol.E72   No.4   pp.266-268
Publication Date: 1989/04/25
Online ISSN: 
Print ISSN: 0000-0000
Type of Manuscript: Special Section LETTER (Special Issue on 1989 Spring National Convention IEICE)
Category: Optoelectronics

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Some sampled servo signal characteristics of an optically switched laser diode (OSL) head are examined. Wobbling signal amplitude increases with bias current and is proportional to the light beam deviation from a track center at around the threshold current corresponding to the low reflection part of the medium. It is confirmed that OSL head tracking can be realized using the sampled servo method.