Spectral Characteristics of Narrow Linewidth InAs/InP Quantum Dot Distributed Feedback Lasers

Tali Septon Andrew and Erna Viterbi Faculty of Electrical Engineering and Russell Berrie Nanotechnology Institute, Technion - Israel Institute of Technology, Haifa, Israel

We report spectral characteristics of InAs/InP QD DFB lasers. Owing to low linewidth enhancement factor and high modal gain, lasers with 5 QD layers exhibit record narrow linewidth of 55 kHz measured by the heterodyne beat note between the laser and an ultra-stable optical frequency comb.