Optical feedback by gain coupling in (In)GaAs/AlGaAs V-groove quantum-wire lasers

Distributed optical feedback by gain coupling in V-groove quantum-wire (QWR) lasers is investigated by using (In)GaAs/AlGaAs active materials grown by metalorganic chemical vapor deposition (MOCVD). In order to avoid grating overgrowth during the fabrication of DFB structures, a newly developed constant MOCVD growth method is employed. Spectral gain anisotropy near the Bragg wavelength, resulting from optical feedback along the DFB direction, is clearly noted from InGaAs/AlGaAs QWR lasers at room temperature both theoretically and experimentally.