Monolithisch integrierte absorptionsmodulierte Laserdioden mit Metallgittern (English shop)

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The dissertation investigates the development and optimization of monolithically integrated laser diodes with electroabsorption modulators for optical data transmission. Particular emphasis is placed on distributed feedback (DFB) lasers employing lateral metal absorption gratings to achieve stable single-mode emission. A key feature is the use of a common active InGaAlAs quantum-well layer for both the laser and modulator sections, reducing fabrication to a single epitaxial growth step. The study examines the optical, electrical, and high-frequency characteristics of integrated devices operating at emission wavelengths of 1.31 and 1.55 µm. By exploiting the quantum-confined Stark effect, high modulation efficiency is achieved at relatively low driving voltages. Experimental results demonstrate data transmission at rates of up to 40 Gbit/s. Further investigations address the integration of semiconductor optical amplifiers and additional modulator sections. The findings highlight opportunities to improve transmission bandwidth, spectral purity, and manufacturing efficiency in optoelectronic transmitters.