Oscillation characteristics in InGaAsP/InP DH lasers with self-aligned structure

This paper presents new stripe geometry InGaAsP/InP DH lasers having mechanisms for suppressing current spreads and for controlling the transverse mode parallel to the junction plane. The theoretical study for optimum design of these lasers from which the analytic method of oscillation characteristics, including control of the transverse mode parallel to the junction plane attributable to refractive index and gain, was derived is discussed. The oscillation characteristics, especially the waveguide properties of the transverse mode are reported. Experimental results show excellent agreement with the theory and show that the transverse mode is totally confined by the built-in passive waveguide for a stripe width of 5 μm.

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