1.55 µm Butt-Jointed Distributed Bragg Reflector Lasers Grown Entirely by Low-Pressure MOVPE

Abstract
1.55 µm distributed Bragg reflector lasers were fabricated entirely by low-pressure MOVPE growth. An active waveguide was connected to a passive waveguide by a butt-joint technique. In the butt-jointed structure, the optical field axis in the active region was matched to that in the passive region. Devices fabricated were operated at currents as low as 13 mA. Spectrum linewidth as narrow as 3.4 MHz was obtained at four times the threshold current.