Optical fiber coupling of 1.2–1.6 μ radiation emitted from buried mesastripe injection lasers

An investigation was made of the efficiency of coupling–into fiber waveguides–of 1.2–1.6 μ radiation emitted by a buried mesastripe InGaPAs–InP heterojunction laser. The maximum power of the radiation coupled into a fiber waveguide was 16 mW in the cw regime at room temperature. The coupling efficiency was 90% in the case of a multimode fiber waveguide and 36% in the case of a single-mode waveguide when matching was provided by a microlens with a radius of ~10 μ