We present a new approach for the modelling of non-linear effects in silicon based ring resonators by coupling equations for Two-Photon-Absorption (TPA), Free-Carrier-Absortpion (FCA) and self-heating with the Shockley–Read–Hall theory involving trap-assisted recombination processes. SRH gives a non-linear carrier lifetime which is essential to fit model results with the experiments. The developed model is validated by comparison with experimental measurements performed on different ring types and it is employed in the design of rings with minimal non-linear effects for integration in ring-based Si PIC mirrors for high power hybrid III-V/Si tunable lasers.
We study the stability of a hybrid laser source consisting of a III-V reflective semiconductor optical amplifier (RSOA) edge-coupled to a silicon photonic mirror, based on two coupled high-Q microring resonators, providing a narrow band effective reflectivity. We simulate the laser dynamics through a model of time-delayed algebraic equations accounting for the frequency-selective mirror reflectivity, demonstrating single-mode emission, self pulsing, and turbulent regimes. Further, we identify the regions of higher CW operation in terms of bias current and laser detuning with respect to the reflectivity peak. Finally, we test the CW laser stability with respect to optical feedback, mimicking the effect of spurious back-reflections from the passive parts of the circuit, and demonstrate ultra-stable CW operation for a sizeable range of detuning.
We developed a Time Domain Traveling Wave model to properly study the dynamics of a hybrid lasers realized by coupling a III-V Reflective Semiconductor Optical Amplifier with a Silicon Photonics mirror providing a narrow effective reflectivity (<10GHz). In free running operation mode, we show that for realistic values of the Henry factor stable single mode emission only occurs around the maximum of the reflectivity slope. Very interestingly for applications, in presence of optical-feedback, we access a regime of ultra-stability with respect to unwanted reflections or to self-oscillations triggered by a photon-photon resonance phenomenon.
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