The study of optical power control for driving circuit using the 650 nanometer low power semiconductor laser

The threshold current of semiconductor laser will increase with increasing temperature, while the output power is decreased. Currently, domestic low-power semiconductor laser power stability is more than 1 percent. Comparison with the current level of domestic market, and in order to stabilize laser power, this paper presents the circuit of laser automatic power control (APC), and through improving the APC circuit parameters to optimize the circuit structure. Tested by experiment, the result shows that the designed circuit is desirable, and the optical power stability is less than 1 percent.