Thermal dependence of the emission linewidth of 1.52-μm single mode InAs/InP quantum dot lasers
Résumé
This paper experimentally investigates the thermal dependence of the emission linewidth of 1.52-μm single mode InAs/InP quantum dot lasers. Using a distributed feedback cavity made with symmetric antireflection coatings, a minimum linewidth of 300 kHz is unveiled. This narrow line is found rather constant with the injection current and the temperature range (293 K-313 K). However, under certain operating conditions, a linewidth rebroadening is also observed, which may be attributed to the spectral hole burning and to the variations of the alpha-factor with the temperature and bias current. Nevertheless, these results confirm the potential of this technology for manufacturing low-phase noise oscillators for coherent optical communications.