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Junqiu Liu

Cette personne n’est plus à l’EPFL

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Publications associées (148)

Symmetry protection against mode crossings in multimode photonic resonator chains

Rui Ning Wang, Tobias Kippenberg, Kenichi Komagata, Junqiu Liu, Mikhail Churaev, Xinru Ji, Alexey Tikan, Aleksandr Tusnin

The accessibility of solitons in driven-dissipative photonic dimers drastically varies for different supermode families. We explain the origin of this phenomenon and show its crucial influence on any soliton lattice configuration including topological arra ...

IEEE2021

320 GHz Analog-to-Digital Converter Exploiting Kerr Soliton Combs and Photonic-Electronic Spectral Stitching

Rui Ning Wang, Tobias Kippenberg, Junqiu Liu, Grigorii Likhachev, Anton Lukashchuk, Viacheslav Snigirev

We demonstrate a photonic-electronic analog-to-digital converter (ADC) offering a record-high acquisition bandwidth of 320 GHz. The system combines a high-speed electro-optic modulator with a Kerr comb for spectrally sliced coherent detection and is used f ...

IEEE2021

Ultrafast optical circuit switching for data centers using integrated soliton microcombs

Tobias Kippenberg, Maxim Karpov, Junqiu Liu, Arslan Sajid Raja, Anton Lukashchuk

Optical technologies could enable fast and power-efficient networks for data centers. Here, the authors report Si3N4 microcomb based ultrafast photonic switching to provide enhanced performance for data center applications. ...

Nature Portfolio2021

High-yield, wafer-scale fabrication of ultralow-loss, dispersion-engineered silicon nitride photonic circuits

Rui Ning Wang, Tobias Kippenberg, Junqiu Liu, Arslan Sajid Raja, Nils Johan Engelsen, Guanhao Huang, Jijun He, Tianyi Liu

Low-loss photonic integrated circuits and microresonators have enabled a wide range of applications, such as narrow-linewidth lasers and chip-scale frequency combs. To translate these into a widespread technology, attaining ultralow optical losses with est ...

Nature Research2021

Parallel convolutional processing using an integrated photonic tensor core

Tobias Kippenberg, Maxim Karpov, Junqiu Liu, Arslan Sajid Raja, Anton Lukashchuk

With the proliferation of ultrahigh-speed mobile networks and internet-connected devices, along with the rise of artificial intelligence (AI)(1), the world is generating exponentially increasing amounts of data that need to be processed in a fast and effic ...

NATURE RESEARCH2021

Optical Gyrator and Microwave-to-Optical Converter using HBAR modes

Rui Ning Wang, Tobias Kippenberg, Junqiu Liu, Wenle Weng, Anat Siddharth

IEEE2021

Difference-frequency generation in optically poled silicon nitride waveguides

Rui Ning Wang, Tobias Kippenberg, Camille Sophie Brès, Junqiu Liu, Edgars Nitiss, Ozan Yakar, Boris Zabelich, Ezgi Sahin

Difference-frequency generation (DFG) is elemental for nonlinear parametric processes such as optical parametric oscillation and is instrumental for generating coherent light at long wavelengths, especially in the middle infrared. Second-order nonlinear fr ...

WALTER DE GRUYTER GMBH2021

Fully self-contained turn-key soliton microcomb source

Rui Ning Wang, Tobias Kippenberg, John David Jost, Junqiu Liu, Grigorii Likhachev, Arslan Sajid Raja, Jijun He

We demonstrate a turn-key microcomb source based on 100 GHz Si3N4 ring microresonator. The device is fully optically and electronically integrated in a compact box, which runs by pushing one button. ...

IEEE2021

Probing the Material Loss and Optical Nonlinearity of Integrated Photonic Materials

Tobias Kippenberg, Junqiu Liu, Guanhao Huang

Optical absorption and nonlinear index are important performance drivers in devices like microcombs and parametric oscillators. Here we use resonance-enhanced nonlinear spectroscopy to characterize absorption limits and nonlinear index for some integrated ...

IEEE2021

Ultra-narrow linewidth lasers and microcombs based on self-injection locking in integrated photonics (Invited)

Tobias Kippenberg, Junqiu Liu

Recent developments of self-injection locking of a DFB laser with an ultra-high Q resonator have enabled unprecedented low-noise performance of coherent light sources. We review the demonstration of ultra-narrow linewidth laser and microcombs in integrated ...

IEEE2021

Symmetry protection against mode crossings for dissipative Kerr soliton generation in microresonator chains

Rui Ning Wang, Tobias Kippenberg, Kenichi Komagata, Junqiu Liu, Mikhail Churaev, Xinru Ji, Alexey Tikan, Aleksandr Tusnin

IEEE2021

Magnetic-free silicon nitride integrated optical isolator

Rui Ning Wang, Tobias Kippenberg, Junqiu Liu, Jijun He, Anat Siddharth

Integrated photonics enables signal synthesis, modulation and conversion using photonic integrated circuits (PICs). Many materials have been developed, among which silicon nitride (Si3N4) has emerged as a leading platform particularly for nonlinear photoni ...

Nature Publishing Group2021

Single-pixel massively parallel coherent LiDAR using on dual soliton microcombs

Tobias Kippenberg, Maxim Karpov, Junqiu Liu, Anton Lukashchuk

IEEE2021

Low-noise, Frequency-agile, Hybrid Integrated Laser for LiDAR

Rui Ning Wang, Tobias Kippenberg, Junqiu Liu, Wenle Weng, Jijun He, Anat Siddharth, Viacheslav Snigirev

We demonstrate a hybrid photonic integrated laser with intrinsic linewidth of 40 Hz, while offering megahertz actuation bandwidth with the tuning range larger than 1 GHz, attained by a DFB laser self-injection locking to a high-Q Si3N4 microresonator with ...

IEEE2021

Polarization selective ultra-braodband wavelength conversion in silicon nitride waveguide

Tobias Kippenberg, Camille Sophie Brès, Junqiu Liu, Arman Ayan, Florent Gilles Mazeas

We report broadband continuous-wave frequency conversion from the O-band (1.33 μm) to the short-wave infrared (2.6 μm) in a 50 cm long low-loss Si3N4 waveguide, leveraging polarization selective far-detuned phase matching. ...

IEEE2021

Magnetic-free Nitride Optical Isolator on Chip

Rui Ning Wang, Tobias Kippenberg, Junqiu Liu, Jijun He, Anat Siddharth

We demonstrated a magnetic-free optical isolator for Si3N4 photonics using AlN piezoelectric actuators. Maximum of 10 dB isolation and

IEEE2021

Simulating Mold Risks under Future Climate Conditions

Rui Ning Wang, Tobias Kippenberg, Junqiu Liu, Wenle Weng, Jijun He, Anat Siddharth, Viacheslav Snigirev

This research tests the potential susceptibility of a prevalent, residential, wall assembly to the risk of sustained mold-growth in predicted future climate conditions. Here, the authors demonstrate a methodology that combines hygrothermal and mold-growth ...

IEEE2021

Continuous-wave electron-light interaction in high-Q whispering gallery microresonators

Rui Ning Wang, Tobias Kippenberg, Junqiu Liu, Arslan Sajid Raja, Guanhao Huang

IEEE2021

Gain-switched semiconductor laser driven soliton microcombs

Tobias Kippenberg, Erwan Guillaume Albert Lucas, Junqiu Liu, Wenle Weng, Jijun He

Dissipative Kerr soliton generation using self-injection-locked III-V lasers has enabled fully integrated hybrid microcombs that operate in turnkey mode and can access microwave repetition rates. Yet, continuous-wave-driven soliton microcombs exhibit low e ...

Nature Research2021

Probing the Limits of Optical Loss in Ion-Sliced Thin-film Lithium Niobate

Tobias Kippenberg, Di Zhu, Junqiu Liu, Guanhao Huang, Mikhail Churaev, Zelin Tan

We measured the absorption-limited loss at telecommunication wavelengths for thin-film lithium niobate micro-ring resonators using Kerr-calibrated linear response technique. We find the average absorption loss-rate kappa(abs)/2 pi to be 3.65 +/- 0.70 MHz, ...

IEEE2021

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