EFFECT OF COUPLING STRENGTH ON THE INTERMODULATION DISTORTION IN DFB LASER

In this work the effect of increasing the coupling strength on the int ermodulation distortion is investigated. It is shown that only if othe r effects such as the change in the relaxation oscillation are absent, higher coupling strength leads to a higher intermodulation distortion . Otherwise, the dependence of distortion on the coupling strength is not monotonic and exhibits trends in the mid- and high-frequency regim es that are very different from that in the low-frequency regime.