Observation of topological frequency combs

On-chip generation of optical frequency combs using nonlinear ring resonators has enabled numerous applications of combs that were otherwise limited to mode-locked lasers. Nevertheless, on-chip frequency combs have relied predominantly on single-ring resonators. Here, we experimentally demonstrate the generation of a novel class of frequency combs, the topological frequency combs, in a two-dimensional lattice of hundreds of ring resonators that hosts fabrication-robust topological edge states with linear dispersion. By pumping these edge states, we demonstrate the generation of a nested frequency comb that shows oscillation of multiple edge state resonances across $\approx$40 longitudinal modes and is spatially confined at the lattice edge. Our results provide an opportunity to explore the interplay between topological physics and nonlinear frequency comb generation in a commercially available nanophotonic platform., , , # Observation of Topological Frequency Combs

\[Access this dataset on Dryad] [https://doi.org/10.5061/dryad.xwdbrv1mw](https://doi.org/10.5061/dryad.xwdbrv1mw)

## Description of the data and file structure

1. 112323_A1_C3R3_Drop_Group_Delay_larger_range.txt

Contains linear transmission and group delay data from Fig. 2 of the manuscript. Format is simple .txt file. Variables, which are columns in the text file, are labeled. In order, they are: Wavelength (nm), Frequency (GHz), Insertion Loss (dB), Group Delay (ps), Chromatic Dispersion (ps/nm).
2. 231122_Run_3_Chip_A1_Col_3_Row_3_HighResOSA_Drop_bkTel_Theta_285__bkTel_swl_1547p35_OSA_N_1_centerwav_1500p0_span_400p0.npz

231122_Run_3_Chip_A1_Col_3_Row_3_HighResOSA_Drop_bkTel_Theta_283__bkTel_swl_1547p35_OSA_N_1_centerwav_1500p0_span_400p0.npz

231122_Run_3_Chip_A1_Col_3_Row_3_HighResOSA_Drop_bkTel_Theta_280__bkTel_swl_1547p35_OSA_N_1_centerwav_1500p0_span_400p0.npz

231122_Run_3_Chip_A1_Col_3_Row_3_HighResOSA_Drop_bkTel_Th...