AlGaInAs/InP Monolithically Integrated DFB Laser Array

The monolithic integration of four 1.50-mu m range AlGaInAs/InP distributed feed-back lasers with a 4x1 multimode-interference optical combiner, a curved semiconductor optical amplifier and an electroabsorption modulator using relatively simple technologies - sidewall grating and quantum well intermixing - has been demonstrated. The four channels span the wavelength range of 1530-1566 nm and can operate separately or simultaneously. The epitaxial structure was designed to produce a far field pattern at the output waveguide facet, which is as small as 21.2 degrees x 25.1 degrees, producing a coupling efficiency with an angled-end single mode fiber at twice that of a conventional device design.