Automatic Cross Carrier-Envelope Phase Locking Within a Dual-Peak Mode-Locked Quantum-Dot Diode Laser

We demonstrated automatic cross carrier-envelope phase locking between two synchronized pulse trains at different wavelengths generated within a single InAs/InP quantum-dot diode laser cavity. The resulting waveforms, verified by optical auto-/cross-correlation and explained by a theoretical model, show multipeaks or quasi-periodic subpulses with a central-subpulse pulse duration of about 183 fs.