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In this work, we optimise the structure of an uncooled directly modulated 1.3 mum GaInNAs ridge waveguide laser for high temperature operation. The static and dynamic performance of the optimised design is analyzed using an accurate in-house 2D electro-opto-thermal laser simulator. The optimised structure is shown to have a lower threshold current, higher efficiency, higher modulation bandwidth and...
In this work, we optimize the thermal performance of a double quantum well GalnNAs ridge waveguide laser using an accurate in-house 2D electro-opto-thermal laser simulator. The simulator has shown good agreement with experiments after a detailed calibration procedure. Using calibrated material parameters, we investigate the influence of the p-cladding doping concentration on the heat generation within...
The net modal gain, effective group index and linewidth enhancement factor (LWEF) in edge-emitting InGaAsN/GaAs lasers have been determined as a function of both temperature and injection current from experimentally amplified spontaneous emission spectra. The shift of the peak gain with temperature was found to be 0.49 nm/K. Values of effective group index between 3.52 and 3.59 were measured, suggesting...
The simulation of double quantum well (QW) GalnNAs ridge-waveguide (RW) lasers is performed over a wide range of cavity lengths and operating temperatures using a comprehensive in-house 2D laser simulator that takes into account all of the major device physics, including current spreading, capture escape processes, drift diffusion in the QW, 2D optical modes and fully resolved lasing spectra. The...
A simulation model for tapered lasers with separated contacts has been developed. The model has been used to simulate 980 nm In-Ga-As devices with separated injection of the ridge-waveguide and taper sections. A good qualitative agreement with experimental results has been obtained. The physical origin of the observed improvements in the beam quality by stronger pumping of the ridge waveguide section...
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