Mode Competition Induced by Optical Feedback in Two-Color Quantum Dot Lasers

Abstract

We investigate theoretically the impact of optical feedback on quantum dot two-color laser dynamics when emitting from both the excited and the ground states. Detailed analysis of the laser dynamics is provided by numerical integrations and continuation techniques, as well as by analytical methods. As the feedback strength is increased the quantum dot laser undergoes a sequence of bifurcations involving steady-states, external cavity modes, self-pulsations and chaos. Furthermore, we report on two interesting mode competition results. First, the optical feedback favors the ground state emission; hence an increase of the feedback strength will generally lead to an increase of the ground state emission output power. Second, the optical feedback can select one lasing state or induce bistable switchings between different steady-states depending on the feedback strength and the injection current.

Investigation of polarization switching of VCSEL subject to intensity modulated and optical feedback

“…7(b) the rate increases to 4.9e-3 mW/degree. For higher I b lower θ p is needed for PS as in line with theoretically predicted data reported in [26]. The results demonstrated that I b can affect the PS dynamic of VCSEL, where a smaller θ p is required to implement PS when the bias current increase.…”

Mode-switching induced super-thermal bunching in quantum-dot microlasers

“…We explore the time dependent light emission dynamics of the bimodal micropillar lasers and provide the first experimental evidence of statistical switching reported for these kind of microscale devices. We clearly show that the nonlinear dynamics of these nanostructured devices can be described (qualitatively and quantitatively) with relatively simple rate equations adapted from the well known two-mode ring laser [12][13][14] and VCSEL [6,7,[15][16][17] models. Fully quantum mechanical theories that derive the equations of motion for photons and correlation expectation values [18,19] have their strength in describing single photon emitters [20] and have also been used to describe the micropillar lasers and their bimodal properties [21].…”

Mutual coupling and synchronization of optically coupled quantum-dot micropillar lasers at ultra-low light levels

“…the reduction of effective optical losses of the weak mode by 2.5%, thus reducing the required inversion of the QDs to maintain lasing and reducing the available gain for the strong modes, as known from two-mode lasers in other setups [62][63][64]. In Fig.…”