Single longitudinal mode operation of two-section GaInAsP/InP lasers under pulsed excitation

Experimental and analytical results show single longitudinal mode operation of groove-coupled two-section GaInAsP/InP lasers during the initial turn-on transient. Optical outputs remain single mode (spurious down ≥10 dB) for temperature ranges
\sim \pm3\deg
C. Laser thresholds and internal current densities are comparable to conventional devices without grooves. Analytical results characterizing the grooves, the below threshold coupled-resonator mode selection, and the complete dynamical buildup of laser energy are summarized. Waveguide scattering theory forms the basis for much of the analysis.