Electro-optically tunable microring laser monolithically integrated on lithium niobate on insulator

We demonstrate monolithic integration of an electro-optically (EO) tunable microring laser on lithium niobate insulator (LNOI) platform. The device is fabricated by photolithography assisted chemo-mechanical etching, and the pump evanescently coupled into erbium ( E mathvariant="normal">r 3 + )-doped (LN) using undoped LN waveguide mounted above microring. quality factor resonator measured as high 1.54 × 1 0 5 at wavelength 1542 nm. Lasing action can be observed a power threshold below 3.5 mW 980 nm continuous-wave laser. Finally, tuning achieved varying electric voltage microelectrodes in vicinity waveguide, showing EO coefficient 0.33 pm/V.