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Jianqi Hu

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Publications associées (41)

Versatile shaping of optical frequency combs and applications

Jianqi Hu

Optical frequency combs are a series of phase-locked and equidistant laser lines in the spectral domain. In the time domain, they correspond to periodic pulse trains by the Fourier relation. The ability to shape optical combs and pulse trains is pivotal to ...

EPFL2021

Spectral self-imaging of optical orbital angular momentum modes

Yin Chen, Camille Sophie Brès, Jianqi Hu, Yujie Chen

The Talbot self-imaging effect is mostly present in the forms of space or time, or in the frequency domain by the Fourier duality. Here, we disclose a new spectral Talbot effect arising in optical orbital angular momentum (OAM) modes. The effect occurs in ...

AIP Publishing2021

Reconfigurable radiofrequency filters based on versatile soliton microcombs

Tobias Kippenberg, Camille Sophie Brès, Maxim Karpov, Junqiu Liu, Jianqi Hu, Arslan Sajid Raja, Anton Lukashchuk, Jijun He

The rapidly maturing integrated Kerr microcombs show significant potential for microwave photonics. Yet, state-of-the-art microcomb-based radiofrequency filters have required programmable pulse shapers, which inevitably increase the system cost, footprint, ...

Nature Research2020

Soliton Microcombs for RF Photonic Filters

Camille Sophie Brès, Jianqi Hu

We review recent progress of the microcomb-based RF photonic filters, and discuss the direct synthesis of reconfigurable RF photonic filters leveraging the rich soliton states in microresonators. (C) 2020 The Author(s) ...

IEEE2020

Two-soliton Microcombs Enabled Reconfigurable Microwave Photonic Filters

Tobias Kippenberg, Camille Sophie Brès, Maxim Karpov, Junqiu Liu, Jianqi Hu, Arslan Sajid Raja, Anton Lukashchuk, Jijun He

We demonstrate reconfigurable microwave photonic filters based on two-soliton microcombs. The filter passbands can be reconfigured inherently via the various angles between two solitons of microresonator, without involving programmable pulse shapers. (C) 2 ...

IEEE2020

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

Add-Drop Multiplexing Architecture for Nyquist OTDM Signals Based on a Single Mach-Zehnder Modulator

Camille Sophie Brès, Svyatoslav Kharitonov, Jianqi Hu, Simon Julien Fabbri

We propose and compare add-drop multiplexing schemes for Nyquist OTDM signals based on 1 x2 or 2 x2 Mach-Zehnder modulator. Bright and dark sinc pulse carver simultaneously provided by the modulator fulfil drop, notch and add functions. ...

IEEE2019

Investigation of temporal Talbot operation in a conventional optical tapped delay line structure

Camille Sophie Brès, Jianqi Hu, Simon Julien Fabbri

2019

Search for CP Violation in D-s(+) -> K-S(0)pi(+), D+ -> (KSK+)-K-0, and D+ -> phi pi(+) Decays

Christoph Frei, Peter Clarke, Aurelio Bay, Minh Tâm Tran, Marc-Olivier Bettler, François Fleuret, Tatsuya Nakada, Guido Haefeli, Niko Neufeld, Olivier Schneider, Hans Dijkstra, Frédéric Teubert, Gerhard Raven, Mingkui Wang, Marilisa Neri, Chitsanu Khurewathanakul, Frédéric Blanc, Matthew Needham, Nathalie Sophie Adeline Serra, Axel Kuonen, Olivier Göran Girard, Liang Sun, Maxime Schubiger, Thibaud Humair, Hang Yin, Xiaoxue Han, Luis Alberto Granado Cardoso, Greig Alan Cowan, Paolo Durante, Guillaume Max Pietrzyk, Matthieu Philippe Luther Marinangeli, Vladislav Balagura, Lino Ferreira Lopes, Albert Puig Navarro, Zhirui Xu, Mark Tobin, Victor Coco, Violaine Bellée, Mirco Dorigo, Yu Zheng, , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , ,

Investigation of temporal Talbot operation in a conventional optical tapped delay line structure

Camille Sophie Brès, Jianqi Hu, Simon Julien Fabbri

We propose a novel scheme of temporal Talbot effect achieving optical pulse train repetition-rate multiplication in a conventional tapped delay line structure. While it is generally used for spectral amplitude filtering, we show that such architecture coul ...

2019

Study of the B-0 (770)degrees K-*(892)(0) decay with an amplitude analysis of B-0 ((+-))(K+pi(-)) decays

Ian William Marison, Christoph Frei, Peter Clarke, Aurelio Bay, Minh Tâm Tran, Marc-Olivier Bettler, François Fleuret, Luc Henry, Tatsuya Nakada, Guido Haefeli, Niko Neufeld, Olivier Schneider, Hans Dijkstra, Valérie Jeanne Thérèse Renaudin-Schouler, Frédéric Teubert, Gerhard Raven, Mingkui Wang, Marilisa Neri, Alessio Ferrari, Léonard Yannick Maurice Eymann, Chitsanu Khurewathanakul, Frédéric Blanc, Matthew Needham, Aleksey Vorobyev, Nathalie Sophie Adeline Serra, Axel Kuonen, Olivier Göran Girard, Jae Sun Jeong, Jiujiu Yu, Basil Andrew Stansfield Davis, Liang Sun, Achille Mauri, Maxime Schubiger, Brice Emile Maurin, Adriano Pastore, Thibaud Humair, Hang Yin, Xiaoxue Han, Greig Alan Cowan, Xiao Di, , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , ,

Flexible Width Nyquist Pulse Based on a Single Mach-Zehnder Modulator

Camille Sophie Brès, Jianqi Hu, Simon Julien Fabbri

We present a Nyquist pulse generation technique based on a single Mach-Zehnder modulator driven by a multi-harmonic electrical signal. The direct control of the RF components yields a range of 10 GHz sinc-shaped pulse train. ...

2018

Linearly chirped mid-infrared supercontinuum in all-normal-dispersion chalcogenide photonic crystal fibers

Camille Sophie Brès, Svyatoslav Kharitonov, Sida Xing, Jianqi Hu

2018

Reconfigurable Filter-free Sinc-shaped RF Photonic Filters Based on Rectangular Optical Frequency Comb

Camille Sophie Brès, Jianqi Hu, Simon Julien Fabbri

We demonstrate reconfigurable sinc-shaped RF photonic filters based on rectangular optical frequency comb synthesized from cascaded modulators. Simplicity of the approach and flexibility in bandwidth for fixed free-spectral-range is shown. Phase response i ...

2018

Talbot effect on orbital angular momentum beams: azimuthal intensity repetition-rate multiplication

Camille Sophie Brès, Jianqi Hu

2018

Fiber fuse in chalcogenide photonic crystal fibers

Camille Sophie Brès, Svyatoslav Kharitonov, Sida Xing, Jianqi Hu

We observe fiber fuse in tapered GeAsSe photonic crystal fibers (PCF) at around 7 MW∕cm2 of intra-core intensity. Vertically cleaved facets from the un-tapered regions and the tapered regions were imaged. The images show shallow voids of different shapes c ...

2018

Self-imaging of Azimuthal Intensity Petal Based on Orbital Angular Momentum Beams

Camille Sophie Brès, Jianqi Hu

We demonstrate for the first time azimuthal Talbot effect based on orbital angular momentum beams. The intensity petal is self-imaged in the azimuthal angle. We also draw the analogy between azimuthal and temporal Talbot effect. ...

2018

MIR supercontinuum in all-normal dispersion Chalcogenide photonic crystal fibers pumped with 2μm femtosecond laser

Camille Sophie Brès, Svyatoslav Kharitonov, Davide Grassani, Sida Xing, Jianqi Hu

We demonstrate mid-infrared supercontinuum generation in an all-normal dispersion Chalcogenide PCF pumped by fiber laser. The -20dB bandwidth is 1.7~2.7μm dominated by self-phase modulation and optical wave breaking. Tapering is proposed to improve perform ...

OSA2017

A photonic circuit for complementary frequency shifting, in-phase quadrature/single sideband modulation and frequency multiplication: analysis and integration feasibility

Jianqi Hu

A novel photonic integrated circuit architecture for implementing orthogonal frequency division multiplexing by means of photonic generation of phase-correlated sub-carriers is proposed. The circuit can also be used for implementing complex modulation, fre ...

Taylor & Francis Ltd2017

Optical Sinc-Shaped Nyquist Pulse Source Based on a Single Mach-Zehnder Modulator

Camille Sophie Brès, Jianqi Hu, Simon Julien Fabbri

We present a precise and flexible Sinc-shaped Nyquist pulse source based on a single Mach-Zehnder modulator. The use of multi-harmonic RF signals provides direct control on the Nyquist pulse train generation. The variable comb source is demonstrated by sel ...

2017

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Plamen Hristov Hopchev

Maria Elena Stramaglia

Veronica Sølund Kirsebom

Aravindhan Venkateswaran

Luis Miguel Garcia Martin

Giovanni Carboni

Zheng Wang

Katharina Müller

A search for charge-parity (CP) violation in Cabibbo-suppressed D-s(+) -> K-S(0)pi(+), D+ -> (KSK+)-K-0, and D+ -> phi pi(+) decays is reported using proton-proton collision data, corresponding to an integrated luminosity of 3.8 fb(-1), collected at a cent ...

2019

Guillaume Max Pietrzyk

Matthieu Philippe Luther Marinangeli

Wanqiu Hu

Darius Constantin Merk

Juan Federico Esteban Müller

Michael Thompson McCann

Maxim Borisyak

Dipanwita Dutta

Plamen Hristov Hopchev

Maria Elena Stramaglia

Veronica Sølund Kirsebom

Aravindhan Venkateswaran

Luis Miguel Garcia Martin

Giovanni Carboni

Zheng Wang

An amplitude analysis of B-0 ((+-))(K+-) decays is performed in the two-body invariant mass regions 300 < m((+-)) < 1100 MeV/c(2), accounting for the (0), , f(0)(500), f(0)(980) and f(0)(1370) resonances, and 750 < m(K+-) < 1200 MeV/c(2), which is dominate ...

Springer Nature2019