DFB-DCPBH InGaAsP/InP lasers for 1550 nm optical communication systems

Room-temperature CW (continuous-wave) operation of distributed feedback (DFB) double channel planar buried heterostructure (DCPBH) InGaAsP, InP lasers emitting in the 1550-nm wavelength region has been achieved. Lasing characteristics and wave propagation in a five-layer DFB waveguide were analyzed to design low threshold current and stable single longitudinal/transversal mode operation. DFB-DCPBH structures with second-order corrugation were prepared by a two-step liquid-phase epitaxial growth process. A threshold current of 50 mA at 25 degrees C and stable single longitudinal mode operation over a wide range of driving current and temperature have been obtained. Linewidth was measured both in DC conditions and in modulated conditions up to 500 MHz.<
>