Enhanced Modulation Bandwidth in Complex Cavity Injection Grating Lasers

Enhanced modulation bandwidth in complex cavity lasers can be obtained by exploiting the coupling between two adjacent cavity modes having proper spectral separation. We investigate the conditions that a complex cavity injection laser device must satisfy in order to take advantage of this effect to significantly increase its modulation bandwidth and we present a general design rule. According to the proposed guidelines, a structure is designed and then dynamically analyzed using a finite-difference time-domain program to show the validity of the proposed method. As an example the proposed guidelines have been adapted also to the design of a distributed Bragg reflector laser and extended modulation was found.