Design and analysis of surface emitting distributed feedback laser for radio over fiber (ROF)

This research is focused on design and analysis of semiconductor laser for ROF application. The alternative and advanced laser is designed for high performance operation and ease in manufacturing; that is a surface emitting distributed feedback (SEDFB) laser. Optimisation is performed at the wavelength of 1.55 μm using the horizontal-cavity structure. This device contains an active region by means of multi-quantum well (MQWs) structure and a separated confinement heterostructure (SCH) in order to optimise its performance. The simulation results in a ridge SEDFB structure producing a single-mode, 1550-nm output operation with optical confinement factor of 0.186, and far-field angle divergence of 450. The transverse edge loss is 0.031 cm-1. An optimum grating duty cycle is in the interval of 0.5-0.6, with a surface loss of 24cm-1. The resulting laser design has a single-lobe pattern with a differential quantum efficiency of 41.3%