Integrated LNOI single-mode lasers by Vernier effect

TL;DR

This paper demonstrates a stable, high-performance single-mode laser in the C-band using Vernier effect in coupled Erbium-doped lithium niobate on insulator microrings, advancing integrated photonics.

Contribution

It reports the first realization of a C-band single-mode laser on LNOI using Vernier effect in coupled microrings with high side-mode suppression.

Findings

Pump threshold of ~200 μW

Side-mode suppression ratio exceeds 26 dB

Stable operation over a large pump power range

Abstract

Microcavity lasers based on erbium-doped lithium niobate on insulator (LNOI), which are key devices for LNOI integrated photonics, have attracted much attention recently. In this Letter, we report the realization of a C-band single-mode laser using Vernier effect in two coupled Erbium-doped LNOI microrings with different radii under the pump of a 980-nm continuous laser. The laser, operating stably over a large range of pumping power, has a pump threshold of ~200 {\mu}W and a side-mode suppression ratio exceeding 26 dB. The high-performance LNOI single-mode laser will promote the development of lithium niobate integrated photonics.