Optical feedback method of stabilizing the output light of a GaALAs injection laser is presented with a simple mathematical model. This method uses the dc output power and the peak-to-peak output power of the laser diode as feedback signal to control its prebias current and modulation current.
Temperature dependent instability of the laser diode's output power is reduced by the factor of 4-60 to be 0.3-0.02 (%/℃) with feedback stabilization than without it, within the temperature range of 0-24(℃).
The experimental results agree reasonably well with those of theoretical analysis.
