Mode interaction in silicon nitride micro-resonators is investigated. We provide clear experimental evidence of mode interaction between two family modes and mode interaction is demonstrated to be the cause of the comb generation in resonators with normal dispersion.
Soliton microcombs based on Kerr nonlinearity in microresonators have been a prominent miniaturized coherent light source. Here, for the first time, we demonstrate the existence of Kerr solitons in an optomechanical microresonator, for which a nonlinear model is built by incorporating a single mechanical mode and multiple optical modes. Interestingly, an exotic vibrational Kerr soliton state is found, which is modulated by a self-sustained mechanical oscillation. Besides, the soliton provides extra mechanical gain through the optical spring effect, and results in phonon lasing with a red-detun…
Intraresonance frequency combs in Kerr microresonators
Faculty of Physics, Lomonosov Moscow State University(莫斯科国立大学物理系);Russian Quantum Center(俄罗斯量子中心);Moscow Institute of Physics and Technology(莫斯科物理技术学院);International Quantum Academy(国际量子研究院);Hefei National Laboratory, University of Science and Technology of China(中国科学技术大学合肥国家实验室);Lebedev Physical Institute, Russian Academy of Sciences(俄罗斯科学院列别捷夫物理研究所)
The Kerr effect in optical microresonators plays an important role for integrated photonic devices and enables third harmonic generation, four-wave mixing, and the generation of microresonator-based frequency combs. Here we experimentally demonstrate that the Kerr nonlinearity can split ultra-high-Q microresonator resonances for two continuous-wave lasers. The resonance splitting is induced by self- and cross-phase modulation and counter-intuitively enables two lasers at different wavelengths to be simultaneously resonant in the same microresonator mode. We develop a pump-probe spectroscopy sc…
Optical injection locking is implemented to faithfully transfer the phase noise of a dissipative Kerr microresonator soliton comb in addition to the amplification of the Kerr comb. Unlike Er-doped fiber and semiconductor optical amplifiers, the optical injection locking amplifies the comb mode without degrading the optical signal-to-noise ratio. In addition, we show that the residual phase noise of the optical injection locking is sufficiently small to transfer the relative phase noise of comb modes (equivalent to the repetition frequency) of low phase noise Kerr combs, concluding that the opt…
We study optical parametric oscillations in Kerr-nonlinear microresonators, revealing an intricate solution space -- parameterized by the pump-to-signal conversion efficiency -- that arises from an interplay of nonlinear processes. Using a three-mode approximation, we derive an efficiency-maximizing relation between pump power and frequency mismatch. To move beyond a three-mode approximation, a necessity for geometries such as integrated microring resonators, we numerically simulate the Lugiato-Lefever Equation that accounts for the full spectrum of nonlinearly-coupled resonator modes. We obse…
克尔微谐振器通过连续波(CW)激光的非线性相互作用产生有趣的和有用的电磁辐射的基本状态。利用光子集成技术,可以实现低噪声、小尺寸、低功耗、可扩展制造以及光子学和电子学的异构组合的功能器件。克尔孤子在克尔微谐振腔中稳定地传播,是产生相干超快脉冲串和超宽带光学频率梳的重要光源。使用f-2f技术,克尔梳支持光学合成和计量的载波包络偏移相位稳定。本文介绍了一种基于光频分(OFD)的克尔微谐振器光钟系统,它是一种将光钟的分数频率稳定度转换为较低频率的电子钟信号的有效技术。这里介绍的时钟是基于氮化硅(Si $_3$ N $_4$)微谐振器,支持光学频率梳组成的孤子脉冲在1太赫兹重复率。通过整个Si $_3$ N $_4$梳的电光相位调制,我们任意地在Si $_3$ N $_4$梳模式之间生成附加的CW模式;在操作上,这降低了脉冲训练重复频率,并且可以用于实现到微波域的OFD。我们的实验特征的剩余频率噪声的克尔微谐振器钟表的一部分,在$10^{17}$,这打开了可能性,使用克尔梳与高性能的光学时钟。此外,光子集成和1太赫兹分辨率的Si $_3$ N $_4$频率梳,使其有吸引力的宽带,低分辨率的液相吸收光谱,我们证明与近红外测量的水,脂质和有机溶剂。
Dissipative Kerr Solitons in a III-V Microresonator
我们在III-V族平台(AlGaAs on SiO $_2$)上通过低温冷却到4~ 20 K的温度来淬灭热折射效应,实现了稳定的微谐振腔克尔孤子频率梳。这种冷却降低了谐振器的热折射系数,其室温值比其他微梳平台如Si $_3$ N $_4$,SiO $_2$和AlN大一个数量级,超过两个数量级,并使孤子状态可接近。实现这种相位稳定的孤子操作对于充分利用该平台所表现出的超高有效非线性和高光学品质因数的应用至关重要。
By generating a Brillouin laser in an optical microresonator, we realize a soliton Kerr microcomb through exciting the Kerr frequency comb using the generated Brillouin laser in the same cavity. The intracavity Brillouin laser pumping scheme enables us to access the soliton states with a blue-detuned input pump. Due to the ultra-narrow linewidth and the low-noise properties of the generated Brillouin laser, the observed soliton microcomb exhibits narrow-linewidth comb lines and stable repetition rate even by using a diode laser with relatively broad linewidth. Also, we demonstrate a low-noise …
The realization of ultrahigh quality (Q) resonators regardless of the underpinning material platforms has been a ceaseless pursuit, because the high Q resonators provide an extreme environment of storage of light to enable observations of many unconventional nonlinear optical phenomenon with high efficiencies. Here, we demonstrate an ultra-high Q factor (7.1*10^6) microresonator on the 4H-silicon-carbide-on-insulator (4H-SiCOI) platform in which both \c{hi}^(2) and \c{hi}^(3) nonlinear processes of high efficiencies have been generated. Broadband frequency conversions, including second-, third…
We present and theoretically investigate a dispersion engineered GaP-OI microresonator containing a partially-etched gap of 250 nm x 410 nm in a 600 nm x 2990 nm waveguide. This gap enables a 3.25 μm wide anomalous dispersion spectral span covering both the near-infrared and the mid-infrared spectra. This anomalous dispersion is manifested by two mechanisms, being the hybridization of the fundamental TE modes around 1550 nm and the geometric dispersion of the higher order TE mode around the 3100 nm wavelengths, respectively. Two Kerr soliton combs can be numerically generated with 101 GHz and …
Frequency combs and coherent dissipative structures in nonlinear optical microresonators
Deutsches Elektronen-Synchrotron DESY(德国电子同步加速器);Universität Hamburg(汉堡大学);Laboratoire Temps-Fréquence, Université de Neuchâtel(纳沙泰尔大学时间频率实验室);Swiss Federal Institute of Technology (EPFL)(瑞士联邦理工学院(洛桑联邦理工学院))
Graduate School of Sciences and Technology for Innovation, Tokushima University(德岛大学科学技术创新研究生院);Institute of Post-LED Photonics, Tokushima University(德岛大学后LED光子研究所);Graduate School of Informatics and Engineering, The University of Electro-Communications(电波大学信息工程研究生院);Institute of Photonics and Human Health Frontier, Tokushima University(德岛大学光子与人类健康前沿研究所)
Broadband Kerr combs with a flat comb spectral profile are expected in a number of applications, such as high-capacity optical communication. Here, we propose novel concentric dual-ring microresonators (DRMs) for advanced dispersion engineering to tailor the comb spectral profile. The dispersion can be flexibly engineered not only by the cross-section of the DRMs, but also by the gap between concentric dual-ring microresonators, which provides a new path to geometrically control the spectral profile of the soliton Kerr combs. An octave-spanning dissipative Kerr soliton comb with superior spect…
All-optical Synchronization of Breather Solitons in a Kerr Microresonator
The University of Auckland(奥克兰大学);The Dodd-Walls Centre for Photonics and Quantum technologies(光子与量子技术多德-沃尔斯中心);Joint Quantum Institute, NIST/University of Maryland(美国国家标准与技术研究院/马里兰大学联合量子研究所);NIST(美国国家标准与技术研究院)
We report that an instability boundary of a single-mode state in Kerr ring microresonators with ultrahigh quality factors breaks the parameter space span by the pump laser power and frequency into a sequence of narrow in frequency and broad in power resonance domains - Arnold tongues. Arnold resonances are located between the Lugiato-Lefever (lower) and universal (higher) thresholds. Pump power estimates corresponding to the universal threshold are elaborated in details. RF-spectra generated within the tongues reveal a transition between the repetition-rate locked and unlocked regimes of the s…