Numerical analysis of the feedback regimes for a singlemode semiconductor laser with external feedback
Abstract
The effect of external feedback on a singlemode semiconductor laser is estimated by a numerical solution of the nonlinear rate equations. The analysis yields an excellent description of published experimental results. It is found that the lasing mode with the minimum linewidth is most stable rather than the mode with minimum threshold gain. The transition to the coherencecollapse regime is of particular interest. It usually occurs for feedback fractions roughly 10 to the 4th, but it can be shifted to considerably larger feedback levels either by increasing the emitted optical power or the laser length or by decreasing the linewidth enhancement factor alpha.
 Publication:

IEEE Journal of Quantum Electronics
 Pub Date:
 July 1988
 DOI:
 10.1109/3.960
 Bibcode:
 1988IJQE...24.1242S
 Keywords:

 Distributed Feedback Lasers;
 Laser Cavities;
 Laser Modes;
 Numerical Analysis;
 Semiconductor Lasers;
 Nonlinear Equations;
 Resonant Frequencies;
 Spectral Line Width;
 Lasers and Masers