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Multi-section distributed-feedback lasers with surface gratings have been fabricated, without re-growth, by employing nanoimprint lithography. High-frequency photon-photon resonance was exploited to extend their direct modulation bandwidth beyond the limitations set by the carrier-photon resonance.
When the longitudinal confinement factor in an edge-emitting laser with two dominant longitudinal modes is treated as a dynamic variable, the modulation transfer function has an extra term. This term produces a supplementary photon-photon resonance in the modulation response at a frequency approximately equal to the frequency separation between the longitudinal modes.
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...
We demonstrate diode lasers with integrated feedback gratings using nanoimprint lithography. Our process is developed for epitaxially grown semiconductors. Due to the feedback from the grating longitudinally single mode lasing is achieved.
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