| 摘要 |
PURPOSE:To accurately detect a temperature change and to stabilize an oscillation wavelength of a semiconductor laser by providing means for holding an injection current at a predetermined value, and means for comparing the terminal voltage of the laser with an arbitrary reference voltage to control an operation temperature in response to an electric signal proportional to the difference between both. CONSTITUTION:An injection current flowing to a semiconductor laser 1 is held at a constant value by a current stabilizer 2. The operating temperature of the laser 1 is altered by a thermoelectric element 3. A differential amplifier 4 compares the terminal voltage of the laser 1 with a reference signal to generate an error signal proportional to the difference of both. A current controller 5 supplies a current corresponding to the error signal to the element 3 to control the temperature of the laser 1. Thus, the terminal voltage is controlled at the predetermined value to maintain the operating temperature constant. Thus, the oscillation wavelength of the laser is stabilized to a predetermined value. |
