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Junqiu Liu

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Publications associées (148)

Dual-frequency-comb spectrometer and spectroscopy method for spectroscopic investigation of a sample

Tobias Kippenberg, Hairun Guo, Junqiu Liu, Wenle Weng

A dual-frequency-comb spectrometer and a method for spectroscopic investigation of a sample are described. The spectrometer includes first and second frequency comb devices for emitting laser pulses along first and second light paths, wherein the repetitio ...

2020

Chip-based soliton microcomb module using a hybrid semiconductor laser

Nicolas Volet, Rui Ning Wang, Tobias Kippenberg, Erwan Guillaume Albert Lucas, Junqiu Liu, Arslan Sajid Raja, Jijun He

Photonic chip-based soliton microcombs have shown rapid progress and have already been used in many system-level applications. There has been substantial progress in realizing soliton microcombs that rely on compact laser sources, culminating in devices th ...

2020

Nano-photonic Supercontinuum Based Mid-Infrared Dual-Comb Spectroscopy

Luc Thévenaz, Tobias Kippenberg, Camille Sophie Brès, Hairun Guo, Junqiu Liu, Wenle Weng

We demonstrate an approach to dual-comb spectroscopy, based on dispersion engineered and ultra-broadband supercontinuum generation in photonic integrated nonlinear waveguides, and driven by low-noise fiber-laser combs. Both technologies arc statc-of-the-ar ...

IEEE2020

Microresonator Dual-Comb Coherent FMCW LiDAR

Tobias Kippenberg, Erwan Guillaume Albert Lucas, Maxim Karpov, Junqiu Liu, Anton Lukashchuk

We introduce a novel architecture for parallel frequency-modulated continuous wave (FMCW) laser ranging (LiDAR). Using dual soliton microcombs, we demonstrate a parallel distance measurement with 24 channels requiring only a single FMCW pump laser and cohe ...

IEEE2020

Frequency Division Using a Soliton-Injected Semiconductor Gain-Switched Frequency Comb

Tobias Kippenberg, Junqiu Liu, Wenle Weng

By injecting a soliton microcomb into a semiconductor laser that is driven by a sinusoidal current at the subharmonic frequencies of the soliton rate, we demonstrate broadband gain-switched frequency comb generation and low-noise microwave synthesis. (C) 2 ...

IEEE2020

Integrated turnkey soliton microcombs

Rui Ning Wang, Tobias Kippenberg, Chao Xiang, Junqiu Liu, Jijun He, Tianyi Liu

Optical frequency combs have a wide range of applications in science and technology(1). An important development for miniature and integrated comb systems is the formation of dissipative Kerr solitons in coherently pumped high-quality-factor optical micror ...

NATURE RESEARCH2020

Silicon Nitride Integrated Nonlinear Photonics

Junqiu Liu

Recently, microresonator-based dissipative Kerr soliton frequency combs ( "soliton microcomb " ) have emerged as miniaturized optical frequency combs. So far, soliton microcombs have been realized in many CMOS-compatible material platforms including silico ...

EPFL2020

Observation of Stimulated Brillouin Scattering in Silicon Nitride Integrated Waveguides

Luc Thévenaz, Rui Ning Wang, Flavien Gyger, Tobias Kippenberg, Junqiu Liu, Arslan Sajid Raja, Jijun He

Silicon nitride (Si3N4) has emerged as a promising material for integrated nonlinear photonics and has been used for broadband soliton microcombs and low-pulse-energy supercontinuum generation. Therefore, understanding all nonlinear optical properties of S ...

2020

Laser Self-Injection Locked Frequency Combs in a Normal GVD Integrated Microresonator

Rui Ning Wang, Tobias Kippenberg, Erwan Guillaume Albert Lucas, John David Jost, Junqiu Liu, Arslan Sajid Raja, Jijun He

We report the first demonstration of microresonator dark pulse generation by self-injection locking of a DFB laser to a Si3N4 microresonator with normal GVD. The 26 GHz repetition rate beatnote is characterized. (C) 2020 The Author(s) ...

IEEE2020

Resonant dissipative Kerr soliton supercontinuum in the normal dispersion regime

Tobias Kippenberg, Tobias Herr, Junqiu Liu, Miles Henry Anderson

We demonstrate broadband resonant supercontinuum generation in a Si3N4 microresonator with normal dispersion. Rectangular bright pulses are shown to form directly using synchronous pulse-driving, generating a 2,600-line comb at 28 GHz repetition rate. (C) ...

IEEE2020

Hybrid Si3N4-LiNbO3 integrated platform for electro-optic conversion

Rui Ning Wang, Tobias Kippenberg, Junqiu Liu, Mikhail Churaev, Tianyi Liu

We demonstrate the integration of a Si3N4 Damascene photonic platform with thin-film lithium niobate on insulator (LNOI) via direct wafer bonding. This process enables fabrication of hybrid chi((2))-chi((3)) microresonators with Q similar to 10(6), as well ...

IEEE2020

Observation of stimulated Brillouin scattering in silicon nitride integrated waveguides

Luc Thévenaz, Flavien Gyger, Tobias Kippenberg, Junqiu Liu, Arslan Sajid Raja, Jijun He

We report the first observation of backward stimulated Brillouin scattering in fully cladded Si3N4 waveguides. The intrinsic Brillouin gain at 25 GHz and the photoelastic constant are estimated to be 4 × 10−13 m/W and |p12| = 0.047 ± 0.004 respectively. ...

Optical Society of America2020

Reconfigurable Radiofrequency Photonic Filters Based on Soliton Microcombs

Tobias Kippenberg, Camille Sophie Brès, Junqiu Liu, Jianqi Hu, Arslan Sajid Raja, Jijun He

We demonstrate soliton based radiofrequency filters using a 104 GHz Si3N4 microresonator. The filter passband frequencies are widely reconfigured via inherent soliton states of perfect soliton crystals and two-soliton microcombs, without any external pulse ...

IEEE2020

Electrically driven photonic integrated soliton microcomb

Tobias Kippenberg, Erwan Guillaume Albert Lucas, John David Jost, Maxim Karpov, Hairun Guo, Junqiu Liu, Arslan Sajid Raja, Andrey Voloshin

We demonstrate via self-injection locking an electrically driven soliton micro-comb by coupling a multi-frequency laser diode to a chip-scale high-Q Si3N4 microresonator. This approach offers a pathway for an integrated and ultra-compact microcomb source f ...

IEEE2019

Nanophotonic supercontinuum based mid-infrared dual-comb spectroscopy

Luc Thévenaz, Tobias Kippenberg, Camille Sophie Brès, Wolfgang Hänsel, Hairun Guo, Junqiu Liu, Wenle Weng

We demonstrate a broadband mid-infrared dual-comb spectroscopy for parallel gas-phase detection in the functional group region from 2800–3600 cm−1, using dispersion engineered silicon nitride dual-core waveguides which produce broadband, intensity-enhanced ...

Optical Society2019

A microphotonic astrocomb

Stefan Kundermann, Tobias Kippenberg, Tobias Herr, Michael Wolfgang Geiselmann, Junqiu Liu, Miles Henry Anderson

Earth-like planets, dark energy and variability of fundamental physical constants can be discovered by observing wavelength shifts in the optical spectra of astronomical objects(1-5). These wavelength shifts are so tiny that exquisitely accurate and precis ...

Nature Publishing Group2019

Broadband Efficient Soliton Microcombs in Pulse-Driven Photonic Microresonators

Sylvain Karlen, Tobias Kippenberg, Tobias Herr, Junqiu Liu, Miles Henry Anderson

Broadband single-soliton based frequency combs, with a detectable repetition rate of 28 GHz, are efficiently generated through pulse-driving of a chip-based Si3N4 microresonator. We observe an influence of the pulse-driving rate on the comb mode linewidth. ...

IEEE2019

Optical coupling device

Tobias Kippenberg, John David Jost, Junqiu Liu, Miles Henry Anderson

The present invention concerns an optical coupling device including at least one supporting layer comprising a first support wall and a second support wall. The at least one supporting layer comprises at least one bridging waveguide for coupling electromag ...

2019

Electrically pumped photonic integrated soliton microcomb (vol 10, 680, 2018)

Tobias Kippenberg, Erwan Guillaume Albert Lucas, John David Jost, Maxim Karpov, Hairun Guo, Junqiu Liu, Arslan Sajid Raja, Andrey Voloshin

Springer2019

Dynamics of soliton crystals in optical microresonators

Tobias Kippenberg, Martin Hubert Peter Pfeiffer, Maxim Karpov, Hairun Guo, Junqiu Liu, Wenle Weng

Dissipative Kerr solitons in optical microresonators combine nonlinear optical physics with photonic-integrated technologies. They are promising for a number of applications ranging from optical coherent communications to astrophysical spectrometer calibra ...

NATURE PUBLISHING GROUP2019

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