Dynamics of Semiconductor Lasers with Optical Feedback

Dynamics of a Micro-VCSEL Operated in the Threshold Region Under Low-Level Optical Feedback

“…Optical communications have been the prime mover behind the investigation of optical feedback on the emission properties of semiconductor lasers, due to the extreme sensitivity of edge-emitting devices to even very low reinjection levels (e.g., from fiber ends [1]). The noise and coherence properties, as well as the emitter's dynamical stability, are thus modified, with detailed features depending on whether the reinjected light fraction carries phase information [2], [3] (coherence length L c > L f , L f feedback length) or whether only the reinjected photon fraction counts [4], [5] (L c < L f ). The large number of investigations dedicated to the study of feedback is reviewed in different papers, depending on the scope: for instance, optical transmission systems [6] or understanding the dynamical features of semiconductor lasers with optical reinjection [7].…”

Comparison of optical feedback dynamics of InAs/GaAs quantum-dot lasers emitting solely on ground or excited states

“…Note that the laser is more sensitive to the feedback phase in the SCR than in the LCR. As can be seen, the edge of the S region humps higher in ξ f (more stable) when the laser is constructively interfered with one of its external cavity modes [28,32]. For the ES laser at 1.5 × I th , as shown in Fig.…”

“…When L ext increases to 200 mm, an FL state with a rotation number of 1:4 is also found. Note that f RO here is increased to about 3 GHz from its free-running value due to the change of the threshold by the feedback [28]. The GS laser subject to feedback is relatively stable such that no C state can be found, even with the strongest feedback attainable in this setup.…”