We investigate the oscillation characteristics of active modulated periodic slabs such as those used for distributed feedback (DFB) lasers. In particular, we examine the effect of modulation wave number on the threshold gain and oscillation frequency of these structures by employing the vector coupled-mode approximation. Significant changes in threshold gain are found for large modulation indices and moderate couplings as compared to the unmodulated case. Small changes in the oscillation frequency are also noted. Methods for lowering threshold gain are suggested.
If you can't find a tool you're looking for, please click the link at the top of the page to "Go to old article view". Alternatively, view our Knowledge Base articles for additional help. Your feedback is important to us, so please let us know if you have comments or ideas for improvement.