Liu Xiaoyue, Ying Pan, Zhong Xuming, Xu Jian, Han Ya, Yu Siyuan, Cai Xinlun
Opt Lett. 2020 Nov 15;45(22):6318-6321. doi: 10.1364/OL.410192.
We demonstrate a high-efficiency thermo-optic (TO) tunable micro-ring resonator in thin-film lithium niobate. Thermal insulation trenches around the heated micro-ring resonator and the underlying silicon substrate significantly reduce the heating power consumption and improve the tuning efficiency. Compared to conventional TO devices without thermal insulation trenches, the proposed device achieves a full free spectral range wavelength shift with a 14.9 mW heating power, corresponding to a thermal tuning efficiency of 53.7 pm/mW, a more than 20-fold improvement of tuning efficiency. The approach enables energy-efficient high-performance TO devices such as optical switches, wavelength routers, and other reconfigurable photonic devices.
我们展示了一种基于薄膜铌酸锂的高效热光（TO）可调谐微环谐振器。加热的微环谐振器及其下方的硅衬底周围的隔热沟槽显著降低了加热功耗并提高了调谐效率。与没有隔热沟槽的传统TO器件相比，该器件在14.9 mW的加热功率下实现了全自由光谱范围的波长偏移，对应于53.7 pm/mW的热调谐效率，调谐效率提高了20多倍。该方法能够实现诸如光开关、波长路由器和其他可重构光子器件等高能效高性能的TO器件。
