820 citations · 6.1k across the 43 of their papers we have counts for
39 papers · 1 filter
All-optical frequency division on-chip using a single laser
Yun Zhao, Jae K. Jang, Karl J. McNulty +4
The generation of spectrally pure high-frequency microwave signals is a critical functionality in fundamental and applied sciences, including metrology and communications. The deve…
Ultra-Low-Loss Silicon Nitride Photonics Based on Deposited Films Compatible with Foundries
Xingchen Ji, Yoshitomo Okawachi, Andres Gil-Molina +4
The fabrication processes of silicon nitride photonic devices used in foundries require low temperature deposition, which typically leads to high propagation losses. Here, we show…
Integrated Electro-Optic Isolator on Thin Film Lithium Niobate
Mengjie Yu, Rebecca Cheng, Christian Reimer +9
Optical isolator is an indispensable component of almost any optical system and is used to protect a laser from unwanted reflections for phase-stable coherent operation. The develo…
Large regenerative parametric amplification on chip at ultra-low pump powers
Yun Zhao, Jae K. Jang, Xingchen Ji +3
Chip-based optical amplifiers can significantly expand the functionalities of photonic devices. In particular, optical-parametric amplifiers (OPAs), with engineerable gain-spectra,…
Femtosecond Pulse Generation via an Integrated Electro-Optic Time Lens
Mengjie Yu, Christian Reimer, David Barton +12
Integrated femtosecond pulse and frequency comb sources are critical components for a wide range of applications. The leading approaches for on-chip pulse generation rely on mode l…
Synchronization of non-solitonic Kerr combs
Bok Young Kim, Jae K. Jang, Yoshitomo Okawachi +3
Synchronization is a ubiquitous phenomenon in nature that manifests as the spectral or temporal locking of coupled nonlinear oscillators. In the field of photonics, synchronization…
Theory of -microresonator-based frequency conversion
Yun Zhao, Jae K. Jang, Yoshitomo Okawachi +1
Microresonator-based platforms with nonlinearities have the potential to perform frequency conversion at high efficiencies and ultralow powers with small footprints. The…
Near-degenerate quadrature-squeezed vacuum generation on a silicon-nitride chip
Yun Zhao, Yoshitomo Okawachi, Jae K. Jang +3
Squeezed states are a primary resource for continuous-variable (CV) quantum information processing. To implement CV protocols in a scalable and robust way, it is desirable to gener…
Observation of Arnold Tongues in Coupled Soliton Kerr Frequency Combs
Jae K. Jang, Xingchen Ji, Chaitanya Joshi +3
We demonstrate various regimes of synchronization in systems of two coupled cavity soliton-based Kerr frequency combs. We show sub-harmonic, harmonic and harmonic-ratio synchroniza…
Raman lasing and soliton modelocking in lithium-niobate microresonators
Mengjie Yu, Yoshitomo Okawachi, Rebecca Cheng +4
The recent advancement in lithium niobate on insulator (LNOI) technology is revolutionizing the optoelectronic industry as devices of higher performance, lower power consumption, a…
Turn-key, high-efficiency Kerr comb source
Bok Young Kim, Yoshitomo Okawachi, Jae K. Jang +6
We demonstrate an approach for automated Kerr comb generation in the normal group-velocity dispersion (GVD) regime. Using a coupled-ring geometry in silicon nitride, we precisely c…
Visible nonlinear photonics via high-order-mode dispersion engineering
Yun Zhao, Xingchen Ji, Bok Young Kim +11
Over the past decade, remarkable advances have been realized in chip-based nonlinear photonic devices for classical and quantum applications in the near- and mid-infrared regimes.…
Supercontinuum generation in angle-etched diamond waveguides
Amirhassan Shams-Ansari, Pawel Latawiec, Yoshitomo Okawachi +8
We experimentally demonstrate on-chip supercontinuum generation in the visible region in angle etched diamond waveguides. We measure an output spectrum spanning 670 nm to 920 nm in…
Coherent two-octave-spanning supercontinuum generation in lithium-niobate waveguides
Mengjie Yu, Boris Desiatov, Yoshitomo Okawachi +2
We demonstrate coherent supercontinuum generation (SCG) in a monolithically integrated lithium-niobate waveguide, under the presence of second- and third-order nonlinear effects. W…
Synchronization of coupled optical microresonators
Jae K. Jang, Alexander Klenner, Xingchen Ji +3
The phenomenon of synchronization occurs universally across the natural sciences and provides critical insight into the behavior of coupled nonlinear dynamical systems. It also off…
Fully integrated ultra-low power Kerr comb generation
Brian Stern, Xingchen Ji, Yoshitomo Okawachi +2
Optical frequency combs are broadband sources that offer mutually-coherent, equidistant spectral lines with unprecedented precision in frequency and timing for an array of applicat…
Counter-rotating cavity solitons in a silicon nitride microresonator
Chaitanya Joshi, Alexander Klenner, Yoshitomo Okawachi +5
We demonstrate the generation of counter-rotating cavity solitons in a silicon nitride microresonator using a fixed, single-frequency laser. We demonstrate a dual 3-soliton state w…
Coherent, directional supercontinuum via cascaded dispersive wave generation
Yoshitomo Okawachi, Mengjie Yu, Jaime Cardenas +3
We demonstrate a novel approach to producing coherent, directional supercontinuum via cascaded dispersive wave generation. By pumping in the normal group-velocity dispersion regime…
Competition between Raman and Kerr effects in microresonator comb generation
Yoshitomo Okawachi, Mengjie Yu, Vivek Venkataraman +5
We investigate the effects of Raman and Kerr gain in crystalline microresonators and determine the conditions required to generate modelocked frequency combs. We show theoretically…
On-chip dual comb source for spectroscopy
Avik Dutt, Chaitanya Joshi, Xingchen Ji +5
Dual-comb spectroscopy is a powerful technique for real-time, broadband optical sampling of molecular spectra which requires no moving components. Recent developments with microres…
Dynamics of mode-coupling-induced microresonator frequency combs in normal dispersion
Jae K. Jang, Yoshitomo Okawachi, Mengjie Yu +4
We experimentally and theoretically investigate the dynamics of microresonator-based frequency comb generation assisted by mode coupling in the normal group-velocity dispersion (GV…
Silicon-chip-based mid-infrared dual-comb spectroscopy
Mengjie Yu, Yoshitomo Okawachi, Austin G. Griffith +3
On-chip spectroscopy that could realize real-time fingerprinting with label-free and high-throughput detection of trace molecules is one of the 'holy grails" of sensing. Such minia…
Breaking the Loss Limitation of On-chip High-confinement Resonators
Xingchen Ji, Felippe A. S. Barbosa, Samantha P. Roberts +6
On-chip optical resonators have the promise of revolutionizing numerous fields including metrology and sensing; however, their optical losses have always lagged behind their larger…
Breather soliton dynamics in microresonators
Mengjie Yu, Jae K. Jang, Yoshitomo Okawachi +6
The generation of temporal cavity solitons in microresonators results in low-noise optical frequency combs which are critical for applications in spectroscopy, astronomy, navigatio…