Semiconductor optoelectronics

The majority of papers in this issue focus on semiconductor laser diodes. The issue begins with a theoretical paper which analyses optical feedback effects in laser diodes with short and long cavities in the cold cavity limit by means of a newly implemented polychromatic model. After that, two experimental papers deal with tunable edge-emitting lasers in which tuning is based on the Vernier effect. The first demonstrates a tunable twin-guide structure utilising superstructure gratings, and the second introduces devices with a Fabry-Perot resonator incorporating a vertically integrated Mach Zehnder interferometer. Chaotic operation of laser diodes is an ongoing topic of discussion and is treated in two contributions. The first looks into chaos generation by a modulated self-pulsating laser diode, and the second introduces a novel arrangement providing double optical feedback into a Fabry-Perot type laser diode using two external cavities. This promises to enhance the security of transmission in chaotic optical communications.