Tunable twin-guide lasers with flat frequency modulation response by quantum confined Stark effect

For the first time results on the frequency modulation response of tunable twin-guide laser diodes utilizing the quantum confined Stark effect in a multiquantum well modulation layer are presented. The structures were grown by metalorganic vapor phase epitaxy and were processed into ridge-waveguide lasers emitting at 1555 nm. Preliminary devices exhibit single-mode output power levels of more than 10 mW and minimum linewidths around 4 MHz. The frequency modulation response is flat up to 2 GHz with a modulation efficiency of 7 GHz/V.