Xinru Ji

Cette personne a quitté l’EPFL

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Publications associées (32)

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

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

IEEE2021

Sub-kHz linewidth, high power, frequency agile photonic integrated E-DBR laser

Tobias Kippenberg, Rui Ning Wang, Johann Emmeram Riemensberger, Anat Siddharth, Zheru Qiu, Xinru Ji

We demonstrate a novel class of lasers, based on the hybrid integration of an RSOA with an extended-distributed Bragg reflector (E-DBR) laser cavity implemented on a Si3N4 chip with microheaters. This enables us to reach sub-kHz laser linewidth with more t ...

Optical Society of America2023

Hybrid integrated multi-lane erbium-doped Si3N4 waveguide amplifiers

Tobias Kippenberg, Zheru Qiu, Xinru Ji

We present the integration of four individual erbium-doped waveguide optical amplifiers on a Si3N4 photonic integrated circuit hybrid integrated with a four-lane semiconductor pump laser diode chip. Each amplifier achieves 15 dB on-chip gain. ...

Optical Society of America2024

Stabilization of SiN Kerr Solitons for the calibration of astronomical spectrographs

Tobias Kippenberg, Rui Ning Wang, Anat Siddharth, Miles Henry Anderson, Xinru Ji

We demonstrate a stabilization scheme for dissipative Kerr solitons in SiN-resonators achieving high comb stability and long-term operation. Measuring 10Hz level absolute Kerr comb line stability (at 1 second) close to the pump, resulting in kHz level stab ...

Optical Society of America2023

Large-Scale Photonic Chip Based Pulse Interleaver for Low-Noise Microwave Generation

Tobias Kippenberg, Rui Ning Wang, Zheru Qiu, Xinru Ji

We demonstrate a 64-times multiplication of a mode-locked laser’s 217 MHz pulse repetition rate to 14 GHz using an integrated Si3N4 interleaver. Six cascaded stages of Mach-Zehnder interferometers with up to 33 cm long optical delay lines are fully integra ...

Springer Science and Business Media Deutschland GmbH2024

A hertz-linewidth Erbium laser based on photonic integrated circuits

Tobias Kippenberg, Rui Ning Wang, Johann Emmeram Riemensberger, Zheru Qiu, Xinru Ji

We demonstrate a photonic integrated circuit-based Erbium laser by endowing an ultralow-loss silicon nitride integrated optical cavity with Erbium-based gain. The free-running laser achieves 50 Hz intrinsic linewidth, 17 mW output power, and 40 nm waveleng ...

Optical Society of America2023

Photonic substrate preparation method and photonic waveguide preparation or fabrication method

Tobias Kippenberg, Zheru Qiu, Xinru Ji, Marta Divall

Photonic integrated circuit optical waveguide device preparation or fabrication method comprising providing a silicon substrate, depositing at least one copper gettering silicon nitride layer or material, depositing at least one optical waveguide cladding ...

2024

Symmetry protection against mode crossings in multimode photonic resonator chains

Tobias Kippenberg, Junqiu Liu, Rui Ning Wang, Mikhail Churaev, Alexey Tikan, Xinru Ji, 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

Sub-MHz linewidth, FMCW photonic integrated blue laser

Tobias Kippenberg, Anat Siddharth, Xinru Ji

We demonstrate for the first time a frequency-modulated continuous wave photonic integrated blue laser with sub-MHz linewidth. The laser exhibits frequency excursion greater than 900 MHz at up to 1 MHz triangular chirp rate with a nonlinearity of less than ...

Institute of Electrical and Electronics Engineers Inc.2024

Compact, Spatial-mode-interaction-free, Ultralow-loss, Nonlinear photonic integrated circuits

Tobias Kippenberg, Junqiu Liu, Rui Ning Wang, Johann Emmeram Riemensberger, Jijun He, Zheru Qiu, Xinru Ji

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 ...

IEEE2022

Edge state optical frequency combs in the microresonator based Su-Schrieffer-Heeger model

Tobias Kippenberg, Xinru Ji, Alexey Tikan, Aleksandr Tusnin

We demonstrate the first observation of optical frequency combs at the edge state of the Su-Schrieffer-Heeger model. We show soliton-induced edge-bulk interaction and edge-state hopping. ...

Optical Society of America2023

Waveguide amplifier and waveguide amplifier fabrication method

Tobias Kippenberg, Xinru Ji, Zheru Qiu, Yang Liu

The present invention concerns a waveguide amplifier comprising: - at least one embedding cladding material or layer, and - at least one rare-earth ion implanted silicon nitride material or layer embedded in the at least one embedding cladding material or ...

2023