STATIC AND DYNAMIC CHARACTERISTICS OF MQW DFB LASERS WITH VARYING RIDGE WIDTH

Static and dynamic characteristics of MQW DFB lasers with varying ridg e width are investigated theoretically with respect to various wavegui de parameters. It is shown that varying the ridge width provides a con venient method to control the lasing mode, longitudinal field distribu tion, quantum efficiency and modulation bandwidth. Comparisons of stat ic and dynamic behaviours among various DFB lasers with varying ridge width and conventional lambda/4-shifted DFB lasers are made for the fi rst time. Some interesting features of these devices are pointed out a nd discussed in detail.