| 摘要 |
PROBLEM TO BE SOLVED: To provide a laser power control circuit capable of easily setting a reference level from the outside. SOLUTION: In this laser power control circuit 14 for controlling laser power which is based on a signal level read by an optical system 12 provided with a laser diode 11, a control input terminal 20 for fetching control information supplied from the outside is provided, and the reference level Vref is adjusted based on the control information inputted from an external adjustment circuit 22 via the control input terminal 20. |
