Abstract

Lithium niobate on insulator (LNOI) has attracted great attention due to its outstanding material properties, such as strong electro-optic effect, large optical nonlinearity, lasing capability, etc. [1]. LNOI has proved to be a powerful platform for various photonic applications, and erbium-doped LNOI (Er: LNOI) with gain property has the potential to build a fully integrated photonic system with active components. Recently, many on-chip waveguide amplifiers and lasers based on Er: LNOI have been reported [2]. To our knowledge, benefiting from optimized waveguide structure, and pumping approaches, the 28.73 dB signal enhancement of the waveguide amplifier we have achieved is the highest one among all reported works on Er: LNOI. Moreover, we have demonstrated the signal amplification at the whole C band.

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