1.55-μm AlGaInAs-InP laterally coupled distributed feedback laser

A novel 1.55-μm AlGaInAs-InP laterally coupled (LC) distributed feedback (DFB) semiconductor laser is presented. Longitudinal feedback and lateral optical confinement are realized simultaneously by incorporating deep gratings etched with inductively coupled plasma technique. Stable single-mode operation with a sidemode suppression ratio over 45 dB has been demonstrated for the fabricated LC-DFB laser.