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Side-Mode-Suppression-Ratio οf Injection-Locked Fabry-Perot Lasers

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Krstić M., Gvozdić D.
Acta Physica Polonica A
|
2009
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vol. 116
|
issue 4
664-667
EN
The paper deals with numerical simulation and theoretical study of injection-locked Fabry-Perot semiconductor laser diodes and their transient and steady-state properties. Motivation for this research comes from the fact that Fabry-Perot semiconductor laser diodes seem to be good candidates for transmitters applied in optical network units of new generation wavelength-division-multiplexed passive optical networks. We base our model on the full scale multimode rate equation system, which comprises all supported longitudinal modes of Fabry-Perot semiconductor laser diode, providing its high reliability and broad applicability. We analyze the influence of bias current and spontaneous emission coupling factor on injection-locking characteristics of Fabry-Perot semiconductor laser diodes and find that injection power of the master laser required to maintain an acceptable side-mode-suppression-ratio strongly depends on these parameters. The emphasis of our investigation is on spontaneous emission coupling factor, since its value is often assumed rather than thoroughly calculated or measured. As we show in the paper, variations of this parameter may affect theoretical results and their comparison with experimental data.
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Intersubband Absorption in Quantum Dash Nanostructures

100%
Crnjanski J., Gvozdić D.
Acta Physica Polonica A
|
2009
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vol. 116
|
issue 4
668-671
EN
The band structure and corresponding intersubband absorption coefficient of quantum dash structures are modeled using a self-consistent single-band effective-mass approach and dipole approximation. Size fluctuation of the quantum dash ensemble, described with Gaussian distribution, is included in the model and its effects on the absorption spectrum are analyzed. The profile of the absorption spectrum is suitable for fitting with a sum of Gaussian functions. We find that the quantum dash ensemble has a pronounced and broad absorption spectrum in mid-infrared region, which becomes broader and more asymmetric with increase of the size fluctuation. In addition, for very large size fluctuation, the spectrum becomes flattened in relatively wide wavelength range.
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