Apparatus and method for controlling the light intensity of a laser diode
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United States of America Patent
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Jun 16, 1992
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N/A
app pub date -
Aug 6, 1991
filing date -
Aug 6, 1991
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Abstract
A closed loop circuit for controlling the intensity of light emitted by a laser diode. A portion of the light emitted by the laser diode is used as an optical feedback signal and applied to a photodetector. The difference between a current produced by the photodetector and a reference current is an error current which is passed via a low impedance path to an integrating amplifier. The integrated error current is used to control the current flowing through the laser diode, thereby controlling the intensity of light emitted.
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