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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 have measured the lateral spontaneous emission profile for the lasers, using scanning near-field optical microscopy (SNOM). Since the near-field of the spontaneous emission maps the lateral carrier distribution in the active region, this measurement provides a way to directly measure the lateral diffusion. The obtained profile therefore represents the optical mode which is well confined...
In order to better understand the differences between lasers with GaAs and GaAsN barriers, this paper has experimentally compared their basic performance characteristics, including threshold currents and spectral gain characteristics. The laser with GaAsN barriers has a reduced N-content in the quantum well to achieve almost identical emission wavelengths. Otherwise the laser structures are the same...
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