An asymmetric cladding gain-coupled DFB laser with oxide defined metal surface grating by MOCVD

Fabrication processes which utilize only a single epitaxial growth step are very attractive in the GaAs-AlGaAs system. We report a ridge waveguide gain-coupled DFB laser which utilizes only a single growth step for the laser structure and incorporates a silicon dioxide defined titanium (Ti) surface grating for the gain-coupling mechanism. The asymmetric cladding lasers in this study were grown by conventional atmospheric pressure MOCVD. The asymmetric cladding separate confinement heterostructure design was implemented to enhance the interaction of the optical mode with the surface metals