MONOLITHICALLY INTEGRATED DBR LASERS WITH SIMPLE TAPERED WAVE-GUIDE FOR LOW-LOSS FIBER COUPLING

The Letter describes InGaAsP/InP 1.55 mum distributed Bragg reflector lasers monolithically integrated with a laterally tapered waveguide on the output facet. The tapered waveguide region of the devices has a t hick partially clad p-InP layer grown by selective growth. The growth and fabrication processing steps were the same as those used to make c onventional DBR laser diodes. The lasers demonstrate good lasing chara cteristics, low-loss coupling of less than 2.8dB and +/- 2 mum misalig nment tolerance with a flat-end singlemode fibre in both the lateral a nd vertical directions.