Apparatus for multilevel optical recording
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United States of America Patent
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Nov 5, 2013
Grant Date -
Jul 27, 2006
app pub date -
Jan 25, 2005
filing date -
Jan 25, 2005
priority date (Note) -
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Abstract
An improvement to an optical recording apparatus is provided for adapting the apparatus for an optical recording format using multiple modulation levels. The improvement includes an electro-optic modulator (EOM) added between a light source and a first modulator, to regulate a power of the light beam supplied to the first modulator. A modulation interface is adapted to output a power control signal to the EOM, and the EOM regulates the power of the light beam supplied to the first modulator to a power level corresponding to the power control signal. The apparatus is further adapted to supply a formatted data signal directly from a formatter to the first modulator, without going through the modulation interface.
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