Method of monitoring and controlling a laser diode
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United States of America Patent
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Mar 25, 2008
Grant Date -
Mar 29, 2007
app pub date -
Sep 9, 2005
filing date -
Sep 9, 2005
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of controlling a laser diode measures an average light output power of the laser diode and compares the average light output power to a desired average light output power within a target range. If the average light output power is not within the target range, the slope efficiency is determined by measuring two light output powers at two different bias conditions. Each of the two light output powers is greater than a selected minimum light output power, which insures that each measurement occurs within the slope efficiency portion of the laser diode curve. A new bias current for the laser diode is calculated based on the measured slope efficiency so as to produce a new average light output power within the target range.
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