Mirror, mirror

Researchers from Fujitsu Laboratories Ltd in Japan have continued their work towards creating low-power highspeed optical transmitters by reducing the peak driving current in their distributed-refl ector (DR) lasers. By using distributed-Bragg-refl ector mirrors and anti-refl ection coatings in the 1.3 ??m AlGaInAs MQW DR lasers, they were able to achieve 25.8 Gbit/s direct modulation with very low driving currents at temperatures up to 85°C.