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Optical isolators based on non-reciprocal optical elements are crucial to protect laser sources from unwanted back-reflections. Commercial optical isolators are built using bulk components and micro-optics technology, and contribute a large fraction of the overall manufacturing cost of a telecom laser. Despite the impressive development in photonic integration techniques, the integration of non-reciprocal...
The linewidth enhancement factor (α-factor), defined as the ratio of carrier-induced variation of real and imaginary parts of the material's susceptibility, has a great importance for semiconductor lasers, as it influences linewidth, chirp, mode stability, laser dynamics, laser behavior in presence of optical feedback. Given that a low value for the α-factor is considered good, Quantum-Dot lasers...
An integrated monolithic device where two DFB lasers are phase-locked via mutual injection, assisted by a Four-Wave-Mixing process that takes place in an auxiliary DFB, generates a spectrally pure tunable mm-wave signal.
Two DFB lasers emitting at different wavelengths are phase-locked via mutual injection assisted by a Four-Wave-Mixing process that takes place in a third auxiliary DFB. This demonstrates the generation of a spectrally pure tunable mm-wave signal without a reference RF seed.
Wireless communication systems require compact sources for the generation of mm-wave signals, that must have high spectral purity (linewidth < 100 kHz, phase noise < 100 dBc @ 100 kHz offset), tuneability, low power consumption and low cost. Other important applications for mm-wave signals are: i) anti-collision car-borne radars (60 GHz); ii) local oscillators for astronomic investigations (100-900...
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