III-V gain region/Si external cavity hybrid tunable lasers with InP-based two-storied ridge structure

III-V/Si hybrid tunable lasers with the InP-based two-storied ridge structure are demonstrated as a light source for the next generation photonic integrated circuits. The wide wavelength tuning range (56.2 nm) and single-mode operation (SMSR > 41 dB) for this wavelength range are achieved.