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专利名称：Calibration method and apparatus发明人：Call, David Ernest,Lewkowicz, Julian申请号：EP92308043.6申请日：19920904公开号：EP0532241B1公开日：19970723
摘要：Method and apparatus for calibrating the drive current circuit of a
semiconductor laser diode subject to reflected optical feedback from a target surfacesuch an an optical recording disk. The method makes use of two power output vs. drivecurrent characteristic curves for the laser, one curve 190 for in-focus condition and theother curve 191 for out-of-focus condition, wherein the curves exhibit an asymptoticregion at high power level (P2). Measurement of drive current I2 at power level P2 istaken under an out-of-focus condition. Measurement of drive current I1 and I3 at apredetermined low power level P1 are taken for both out-of-focus condition and in-focuscondition. The linear slope of the in-focus curve 190 can thus be calculated to set desiredpower levels.
申请人：IBM
地址：US
国籍：US
代理机构：Burt, Roger James, Dr.
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