FM and AM responses of a three-electrode DBR laser diode

This paper focuses the three-electrode DBR laser diode, which has an active Fabry-Perot section, and two passive sections, one for phase control and one with a built-corrugation for frequency control. The passives waveguides are usually made of materials with a higher bandgap. There is only spontaneous and no stimulated recombination in these sections. The laser FM response is determined by the simultaneous action of temperature modulation effect (dominant at low frequency) and the active region carrier density modulation effect (dominant at high rates). The FM efficiency and the bandwidth depend on the modulation current into one of the passive sections or both sections.