Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

View full-text article in PMC

. 2023 Jun 12;14:3467. doi: 10.1038/s41467-023-39229-3

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

© The Author(s) 2023

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

PMC Copyright notice

Fig. 2 — a–c, f Optical spectra of soliton combs with repetition rates of 200, 44.84, 19.82, and 13.5 GHz, respectively, which are produced in LN comb resonators with radii of 100 (a), 450 (b), 1020 (c), and 1500 μm (f). The corresponding on-chip pump power is 33 (a), 396 (b), 282 (c), and 400 mW (f), respectively. In a, c, f, the pump mode was filtered out by a fiber Bragg grating filter. The right panel in b shows the electrical spectrum of the detected microwave signal from the 44.84 GHz soliton comb. The resolution bandwidth (RBW) of the RF spectrum is 500 Hz. d and e Electrical spectrum and phase noise of the detected 19.82 GHz microwave signal produced by the soliton comb shown in (c). The soliton comb was boosted by an optical amplifier before it is detected by a high-speed detector. g and h Same as d and e but for the 13.5 GHz soliton comb shown in (f). In d and g, the RBW of the RF spectrum is 200 Hz. In all figures, the devices are free running without active feedback, and the pump-laser-cavity detuning is self-stabilized by the photorefractive effect.