Photonics Research Issues: Tunable broadband two-point-coupled ultra-high-Q visible and near-infrared photonic integrated resonators
We report a significant advancement in high-performance integrated resonators based on a two-point-coupling design that achieves critical coupling simultaneously at multiple wavelengths across wide wavebands and tuning of the coupling condition at any wavelength, from under-, through critically, to over-coupled.
We have demonstrated for the first time a two-point-coupled ultra-high-Q 10-meter-coil silicon nitride waveguide resonator that is critically coupled every ∼2.8 nm from 1550 nm to 1630 nm and measures a 340-million intrinsic Q and 0.074-dB/m waveguide propagation loss. We also validate that the two-point-coupling design does not create excess loss in the ultra-high-Q regime.
Our published results can enhance the performance of applications, such as self-injection locked lasers, laser stabilization, squeezed light generation, and efficient OPO emitters, and greatly benefit AMO experiments and applications, quantum computing and sensing, fiber sensing, optical atomic clocks, precision metrology, and low-noise microwave generation.
Our results were published yesterday, August 19, 2024, in Photonics Research Issues.
