Person
Jijun He
This person is no longer with EPFL
Related publications (37)
Cascaded all-optical quantization employing step-size MMI and shape-optimized power splitter
Jijun He, Xiaowei Zhang, Jian Wu, Ye Tian
As a key unit of future high-throughput communications, optical analog to digital converter (OADC) with all-optical quantizer element that simultaneously possesses high resolution, large bandwidth and compact size is highly promising. A pending issue of co ...
ELSEVIER SCI LTD2023Compact, spatial-mode-interaction-free, ultralow-loss, nonlinear photonic integrated circuits
Tobias Kippenberg, Rui Ning Wang, Xinru Ji, Zheru Qiu, Junqiu Liu, Jijun He
Multi-mode waveguides are ubiquitously used in integrated photonics. Although interaction among different spatial waveguide eigenmodes can induce novel nonlinear phenomena, spatial mode interaction is typically undesired. Adiabatic bends, such as Euler ben ...
NATURE PORTFOLIO2022Low-noise frequency-agile photonic integrated lasers for coherent ranging
Tobias Kippenberg, Rui Ning Wang, Anat Siddharth, Andrey Voloshin, Viacheslav Snigirev, Junqiu Liu, Wenle Weng, Jijun He, Vladimir Shadymov
Stable and tunable integrated lasers are fundamental building blocks for applications from spectroscopy to imaging and communication. Here the authors present a narrow linewidth hybrid photonic integrated laser with low frequency noise and fast linear wave ...
NATURE PORTFOLIO2022A photonic integrated circuit-based erbium-doped amplifier
Tobias Kippenberg, Rui Ning Wang, Xinru Ji, Zheru Qiu, Junqiu Liu, Yang Liu, Jijun He, Anton Lukashchuk
Erbium-doped fiber amplifiers revolutionized long-haul optical communications and laser technology. Erbium ions could provide a basis for efficient optical amplification in photonic integrated circuits but their use remains impractical as a result of insuf ...
AMER ASSOC ADVANCEMENT SCIENCE2022Microresonator Dissipative Kerr Solitons Synchronized to an Optoelectronic Oscillator
Tobias Kippenberg, Wenle Weng, Jijun He
Using phase-modulation-induced potential gradient whose period is synchronized to a microwave opto-electronic oscillator, dissipative Kerr solitons generated in a crystalline optical microresonator are trapped by the soliton tweezing effect, exhibiting a s ...
AMER PHYSICAL SOC2022Platicon microcomb generation using laser self-injection locking
Tobias Kippenberg, Rui Ning Wang, Junqiu Liu, Wenle Weng, Yang Liu, Jijun He, Miles Henry Anderson
The past decade has witnessed major advances in the development and system-level applications of photonic integrated microcombs, that are coherent, broadband optical frequency combs with repetition rates in the millimeter-wave to terahertz domain. Most of ...
NATURE PORTFOLIO2022A photonic integrated continuous-travelling-wave parametric amplifier
Tobias Kippenberg, Rui Ning Wang, Nikolai Kuznetsov, Junqiu Liu, Jijun He
The ability to amplify optical signals is of pivotal importance across science and technology typically using rare-earth-doped fibres or gain media based on III-V semiconductors. A different physical process to amplify optical signals is to use the Kerr no ...
NATURE PORTFOLIO2022Compact, Spatial-mode-interaction-free, Ultralow-loss, Nonlinear photonic integrated circuits
Tobias Kippenberg, Rui Ning Wang, Xinru Ji, Zheru Qiu, Junqiu Liu, Jijun He
We implement Euler bends to build compact high-Q Si3N4 racetrack microresonators, featuring a small footprint of only 0.21 mm(2) for 19.8 GHz FSR. We demonstrate that these multi-mode microresonators can be operated in the single-mode regime and generate a ...
IEEE2022Time-continuous Travelling-Wave Optical Parametric Amplification in a Photonic Circuit
Tobias Kippenberg, Rui Ning Wang, Nikolai Kuznetsov, Junqiu Liu, Jijun He
We demonstrate a traveling wave parametric amplifier in a photonic Si3N4 integrated spiral waveguide of 2.0 m length with footprint 3x5 mm. We achieve net gain of 7 dB on-chip and 2 dB fiberto-fiber in the optical C-band. (C) 2022 The Author(s) ...
IEEE2022A Photonic Integrated Circuit-Based Erbium-doped Waveguide Amplifier
Tobias Kippenberg, Rui Ning Wang, Xinru Ji, Zheru Qiu, Junqiu Liu, Yang Liu, Jijun He
We demonstrate an erbium-doped waveguide amplifier by erbium ion implantation in Si3N4 photonic integrated circuits, achieving 145 mW on-chip output power and more than 30 dB small-signal gain, which is on par with commercial fiber amplifiers and beyond st ...
IEEE2022