Share Email Print
cover

Proceedings Paper • new

Dynamical modalities in Kerr frequency combs (Conference Presentation)
Author(s): Jinghui Yang; Abhinav Kumar Vinod; Hao Liu; Wenting Wang; Jinkang Lim; Shu-Wei Huang; Chee Wei Wong
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

Recent advances in sub-wavelength nanoscale platforms have afforded the control of light from first principles, with impact to ultrafast sciences, optoelectronics and precision measurements. In this talk we will describe recent advances in chip-scale Kerr frequency comb oscillators, where we have achieved sub-100-fs mode-locking, stabilization down to a tooth-to-tooth relative frequency uncertainty of 50 mHz and 2.7×10^{−16}, and single-mode broadband frequency comb generation. Each of these are supported by linear and nonlinear numerical modeling. In this first chip-scale realization, coherent mode-locking is observed in the normal dispersion regime, verified by phase-resolved ultrafast spectroscopy at sub-100-attojoule sensitivities. The normal dispersion architecture uncovers the mode-locking mechanisms in Kerr frequency combs, matched with first-principles coupled-mode theory. In the second realization, we examine the noise limits in the full stabilization of chip-scale optical frequency combs. The microcomb’s two degrees of freedom, one of the comb lines and the native 18-GHz comb spacing, are simultaneously phase-locked to known optical and microwave references. Active comb spacing stabilization improves long-term stability by six orders of magnitude, reaching a record instrument-limited residual instability of 3.6 mHz per root tau. Comparing 46 nitride frequency comb lines with a benchmark fiber laser frequency comb, we demonstrate the unprecedented microcomb tooth-to-tooth relative frequency uncertainty down to 50 mHz and 2.7×10^{−16}. In the third realization, we report a novel design of Si3N4 microresonator in which single-mode operation, high quality factor, and anomalous dispersion are attained simultaneously. The novel microresonator consists of uniform single-mode waveguides in the semi-circle region, to eliminate bending induced mode coupling, and adiabatically tapered waveguides in the straight region, to avoid excitation of higher order modes. With this microresonator, we demonstrate broadband phase-locked frequency combs. This supports the focus towards chip-scale precision spectroscopy, timing, coherent communications, and astronomical spectrography.

Paper Details

Date Published: 14 March 2018
PDF
Proc. SPIE 10526, Physics and Simulation of Optoelectronic Devices XXVI, 105260B (14 March 2018); doi: 10.1117/12.2293279
Show Author Affiliations
Jinghui Yang, Univ. of California, Los Angeles (United States)
Abhinav Kumar Vinod, Univ. of California, Los Angeles (United States)
Hao Liu, Univ. of California, Los Angeles (United States)
Wenting Wang, Univ. of California, Los Angeles (United States)
Jinkang Lim, Univ. of California, Los Angeles (United States)
Shu-Wei Huang, Univ. of California, Los Angeles (United States)
Chee Wei Wong, Univ. of California, Los Angeles (United States)


Published in SPIE Proceedings Vol. 10526:
Physics and Simulation of Optoelectronic Devices XXVI
Bernd Witzigmann; Marek Osiński; Yasuhiko Arakawa, Editor(s)

© SPIE. Terms of Use
Back to Top