| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and a circuit device for a laser control loop, having automatic adaptation for monitoring signal polarity. SOLUTION: By utilizing a single step method, a signal which is generated by a monitor during the starting step of a laser control loop is compared with a reference value. On the basis of the result of the comparison, the signal generated by monitor is fed to a comparator which controls optical output of a laser during the start step of the laser control loop, directly or after inversion. An inverted monitoring signal is fed first to the comparator which controls an arbitrary output by a method, which is irrespective of monitoring signal polarity and depends on polarity of the reference value. Alternatively, the monitoring signal is fed directly, and a signal which feeds the monitoring signal through a non-inverted manner with regard to the monitoring signal reaching the reference value is generated.
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