NOTICE: Due to a lapse in annual appropriations, most of this website is not being updated. Learn more.
Form submissions will still be accepted but will not receive responses at this time. Sections of this site for programs using non-appropriated funds (such as NVLAP) or those that are excepted from the shutdown (such as CHIPS and NVD) will continue to be updated.
An official website of the United States government
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.
Igor Kudelin, William Groman, Scott Diddams, Dahyeon Lee, Megan Kelleher, Takuma Nakamura, Charles McLemore, Franklyn Quinlan, Qing-Xin Ji, Joel Guo, Andrey Matsko, John Bowers, Kerry Vahala, Warren Jin, Lue Wu, Yifan Liu, Wei Zhang, Steven Bowers, Joe Campbell, Pedram Shirmohammadi, Samin Hanifi, Haotian Cheng, Naijun Jin, Sam Halliday, Zhaowei Dai, Chao Xiang, Vladimir Iltchenko, Owen Miller, Peter Rakich
Abstract
Numerous modern technologies are reliant on the low-phase noise and timing stability performance of microwave signals. Substantial progress has been made in the field of microwave photonics, whereby low noise microwave signals are generated by the down-conversion of ultra-stable optical references using a frequency comb. Such systems, however, are constructed with bulk or fiber optics and are difficult to further reduce in size and power consumption. In this work, we leverage advances in integrated photonics to demonstrate low-noise microwave generation via two-point optical frequency division. Narrow linewidth self-injection locked integrated lasers are stabilized to a miniature Fabry-P\'e}rot cavity, and the frequency gap between the lasers is divided with an efficient dark-soliton frequency comb. The stabilized output of the microcomb is photodetected to produce a microwave signal at 20 GHz with phase noise of -95 dBc/Hz (-136.8 dBc/Hz) at 100 Hz (10 kHz) offset frequency--values which are unprecedented for an integrated photonic system. All photonic components can be heterogeneously integrated on a single chip, providing a significant advance for the application of photonics to high-precision navigation, communication and timing systems.
Kudelin, I.
, Groman, W.
, Diddams, S.
, Lee, D.
, Kelleher, M.
, Nakamura, T.
, McLemore, C.
, Quinlan, F.
, Ji, Q.
, Guo, J.
, Matsko, A.
, Bowers, J.
, Vahala, K.
, Jin, W.
, Wu, L.
, Liu, Y.
, Zhang, W.
, Bowers, S.
, Campbell, J.
, Shirmohammadi, P.
, Hanifi, S.
, Cheng, H.
, Jin, N.
, Halliday, S.
, Dai, Z.
, Xiang, C.
, Iltchenko, V.
, Miller, O.
and Rakich, P.
(2024),
Photonic chip-based low noise microwave oscillator, Nature Photonics, [online], https://doi.org/10.1038/s41586-024-07058-z, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=956308
(Accessed October 10, 2025)