| 摘要 |
PURPOSE:To enable to drive a semiconductor laser in the optimum state even if a temperature varies by detecting the temperature of the laser and controlling the bias current and the drive pulse current to the optimum value to the temperature. CONSTITUTION:A thermistor TH is contained in the module of a semiconductor laser LD, and the temperature of the laser is correctly detected. The detected output is amplified by an operation amplifier OP1, the bias current is optimally controlled at an operational amplifier OP2and the drive pulse current an operational amplifier OP3by the output of the amplifier OP1 respectively. The adjustment of the optimum control is performed by regulating the operations of the amplifiers OP1, OP2, OP3 by variable resistors RV1, RV2, RV3. |
