160-GHz 1.55- Colliding-Pulse Mode-Locked AlGaInAs/InP Laser With High Power and Low Divergence Angle

摘要

A monolithic ${sim}{rm 1.55}hbox{-}mu{rm m}$ colliding-pulse mode-locked AlGaInAs/InP laser with a three-quantum-well active layer incorporating a passive far-field reduction layer has been demonstrated. The device emits pulses at 162 GHz, with a pulsewidth of 0.98 ps, a pulse energy of 0.13 pJ, and a time-bandwidth product of 0.52, while demonstrating a low divergence angle $(12.7^{circ}times 26.3^{circ})$ with a twofold improvement in butt coupling efficiency to a flat cleaved single-mode fiber, compared to the conventional mode-locked lasers.