1-Step OMVPE Grown Strongly Index-Coupled Membrane DFB Laser with Surface Corrugation Grating Structure

Strongly index-coupled GaInAsP/InP membrane DFB laser, consisting of a flat single-quantum-well active region, was realized by adopting a surface corrugation structure. A threshold pump power as low as 1.1 mW was achieved under RT-CW condition for the stripe width of 2.0 μm and the cavity length of 60 mum. The index-coupling coefficient was estimated to be 3,200 cm
^-1
for the surface corrugation depth of 50 nm