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Picosecond Spectral Dynamics of Gain-Switched DFB Lasers

Picosecond Spectral Dynamics of Gain-Switched DFB Lasers,10.1109/JQE.2010.2096501,IEEE Journal of Quantum Electronics,Sina Margareta Riecke,Hans Wenze

Picosecond Spectral Dynamics of Gain-Switched DFB Lasers  
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We study the generation of picosecond pulses by gain-switching of distributed feedback ridge-waveguide laser diodes. By pumping with short current pulses without d.c. bias, we obtain laser pulses with peak powers above 1 W at a wavelength around 1065 nm. These pulses exhibit strong spectral dynamics stemming from mode competition after switch-on. Typ- ically, emission begins with a broad spectrum, before narrowing down to the Bragg line within a few hundred picoseconds. This dynamic behavior is studied in detail both experimentally and numerically for a variety of grating parameters. Using a rate- equation model with two species of photons, we achieve excellent agreement between simulation and experiment. In conclusion, we discuss the optimization of DFB laser diodes for short pulse generation.
Journal: IEEE Journal of Quantum Electronics - IEEE J QUANTUM ELECTRON , vol. 47, no. 5, pp. 715-722, 2011
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