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Erbium-doped lithium niobate on insulator (Er:LNOI) has attracted enormousinterest as it provides gain and enables integrated amplifiers and lasers onthe lithium niobate on insulator (LNOI) platform. We demonstrate a highlyefficient waveguide amplifier on Er:LNOI. The 2.58-cm long amplifier canachieve 27.94 dB signal enhancement, 16.0 dB internal net gain (6.20 dB/cm),-8.84 dBm saturation power, 4.59 dB/mW power conversion efficiency, and 4.49 dBnoise figure at 1531.6 nm. Besides, thorough investigation on the pumpingwavelength, pumping scheme, output power and noise figure have been performedto provide a comprehensive understanding on this novel waveguide amplifier.This work will benefit the development of a powerful gain platform and can pavethe way for a fully integrated photonic system on LNOI platform.

Erbium-doped lithium niobate thin film waveguide amplifier with 16 dB internal net gain