光电微波振荡器中DFB laser对相位噪声的贡献

一种芯片集成的基于光频梳的微波振荡器

A chip-integrated comb-based microwave oscillator

本研究研发出首款完全集成的基于微梳的微波振荡器芯片，采用混合集成架构，在极小尺寸内实现超低噪声微波输出，有望赋能通信、传感等多领域发展。

基于稳定周期一非线性激光动力学与受激布里渊散射的微波光子短时傅里叶变换

Microwave photonic short-time Fourier transform based on stabilized period-one nonlinear laser dynamics and stimulated Brillouin scattering

本研究提出结合稳定P1非线性激光动力学与SBS的微波光子STFT系统，经光电反馈稳定扫频信号并结合SBS光带通滤波实现频率-时间映射，实验验证其可提升时频图质量与测频精度，最优带宽下平均绝对误差降50%。

用于地球观测应用的V波段光电振荡器

V-band Optoelectronic Oscillator for Earth Observation Applications

本文演示了45.86 GHz V波段光电振荡器，其低SWaP特性在边模抑制、相位噪声等性能上与ESA地球观测任务现有电子系统相当或更优，有望替代或补充现有锁相介质谐振器振荡器和倍频器。

300 GHz generation based on a Kerr microresonator frequency comb stabilized to a low noise microwave reference

In this letter, we experimentally demonstrate low noise 300GHz wave generation based on a Kerr microresonator frequency comb operating in soliton regime. The spectral purity of a 10GHz GPS-disciplined dielectric resonant oscillator is transferred to the 300GHz repetition rate frequency of the soliton comb through an optoelectronic phase-locked loop. Two adjacent comb lines beat on a uni-travelling carrier photodiode emitting the 300GHz millimeter-wave signal into a waveguide. In an out-of-loop measurement we have measured the 300GHz power spectral density of phase noise to be -88dBc/Hz, -105dB…

Integrated Electro-Optic Isolator on Thin Film Lithium Niobate

Optical isolator is an indispensable component of almost any optical system and is used to protect a laser from unwanted reflections for phase-stable coherent operation. The development of chip-scale optical systems, powered by semiconductor lasers integrated on the same chip, has resulted in a need for a fully integrated optical isolator. However, conventional approaches based on application of magneto-optic materials to break the reciprocity and provide required isolation have significant challenges in terms of material processing and insertion loss. As a result, many magnetic-free approache…

Continuous tuning & thermally induced frequency drift stabilisation of time delay oscillators such as the optoelectronic oscillator

Delay line oscillators based on photonic components, such as the optoelectronic oscillator (OEO), offer the potential for realization of phase noise levels orders of magnitude lower than achievable by conventional microwave sources. Fibre optic-based delay lines can realize the large delay required for low phase noise systems whilst simultaneously achieving insertion loss levels that can be compensated by available microwave and photonic amplification technologies. However, the long fibre is vulnerable to environmental perturbations such as mechanical vibrations and variations in ambient tempe…

Photonic microwave signals with zeptosecond level absolute timing noise

Photonic synthesis of radiofrequency revived the quest for unrivalled microwave purity by its seducing ability to convey the benefits of the optics to the microwave world. In this work, we perform a high-fidelity transfer of frequency stability between an optical reference and a microwave signal via a low-noise fiber-based frequency comb and cutting-edge photo-detection techniques. We demonstrate the generation of the purest microwave signal with a fractional frequency stability below 6.5 x 10^-16 at 1 s and a timing noise floor below 41 zs.Hz^-1/2 (phase noise below -173 dBc.Hz^-1 for a 12 GH…

泵浦锁定微腔布里渊激光器

Pump-locked microcavity Brillouin laser

针对传统微腔激光器泵浦频率锁定系统复杂、成本高的问题，提出利用微腔瑞利散射的全光泵浦锁定方法，实现了超窄线宽、高长期稳定性且无需温控隔振的微腔布里渊激光器，为多领域提供低成本实验平台。

Microwave generation and frequency comb in a silicon optomechanical cavity with a full phononic bandgap

Cavity optomechanics has become a powerful tool to manipulate mechanical motion via optical fields. When driving an optomechanical cavity with blue-detuned laser the mechanical motion is amplified, ultimately resulting in phonon lasing. In this work, we show that a silicon optomechanical crystal cavity can be used as an optoelectronic oscillator when driven to the phonon lasing condition. To this end, we use an optomechanical cavity designed to have a breathing-like mechanical mode vibrating at $Ω_{m}/2π=$3.897 GHz in a full phononic bandgap. Our measurements show that the first harmonic displ…

PT对称交叉注入双光电振荡器

PT-symmetric cross injection dual optoelectronic oscillator

本文研究了PT对称概念在光电振荡器中的应用，推导了耦合器传输矩阵，提出两种等效配置实现局部模式选择性的PT对称相变，并验证了理论与仿真结果的一致性。

集成氮化硅与薄膜铌酸锂平台中的声电增强声光调制

Acoustoelectrically enhanced acousto-optic modulation in an integrated silicon nitride and thin film lithium niobate platform

本研究首次在集成氮化硅与薄膜铌酸锂平台上实现声电增强声光调制，通过片上声电放大达60 dB，实现低功耗高效相位调制，并提出了可替代光纤延迟的声电增强光声振荡器方案。