Optimisation of a corrugation-pitch-modulated DFB laser structure with inhomogeneous coupling coefficient for stable single longitudinal mode operationJ. B. M. Boavida, J. A. P. Morgado and C. A. F. FernandesEur. Phys. J. Appl. Phys., 48 3 (2009) 30701DOI: https://doi.org/10.1051/epjap/2009186