Measuring the sensitivity to optical feedback of single-frequency high-power laser diodes

Laser diodes, in general, are sensitive to optical feedback, especially with regard maintaining single-frequency operation. Until now, however, the feedback sensitivity of high-power devices such as distributed Bragg reflector (DBR) tapered laser diodes has not been investigated quantitative detail. In this paper, we analyze impact very weak between ? 105 d mathvariant="normal">B and 40 on a DBR diode. The measurement setup is validated using typical DFB results good agreement theory at low-feedback levels.