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Microwave frequency upconversion employing a coupling-modulated ring resonator

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Photonics Research 2017年第6期5卷 208-213页

作者： YIMING ZHONG LINJIE ZHOU YANYANG ZHOU YUJIE XIA SIQI LIU LIANGJUN LU JIANPING CHEN XINGJUN WANG Shanghai Institute for advanced communication and Data Science State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University state key laboratory of advanced optical communication systems and networks School of Electronics Engineering and Computer SciencePeking University

We present a method to generate a frequency-doubled microwave signal by employing a coupling-modulated ring resonator. Critical coupling is achieved when the resonator intrinsic loss is perfectly balanced by the external coupling enabled by a Mach–Zehnder interferometer coupler. The high suppression of the carrier leads to a clean two-tone optical signal with the frequency interval two times larger than that of the input microwave *** beating of the two-tone signal at a photodiode generates the frequency upconverted microwave signal.A theoretical model is established to analyze the modulation process and the microwave signal *** results show that the electrical harmonic suppression ratio is around ~20 dB(29 dB) for an input microwave signal with 5 dBm(10 dBm) power.

关键词： Microwave frequency upconversion employing a coupling-modulated ring resonator MZI

Measurement of the magnetic field-dependent refractive index of magnetic fluids in bulk

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Chinese Optics Letters 2008年第3期6卷 195-197页

作者：刘婷陈险峰狄子昀张军锋李新碗陈建平 The state key laboratory on Fiber Optic Local Area communication networks and advanced optical communication systems Shanghai Jiao Tong University

An optical alignment-free and highly accurate method is employed to measure the magnetic field-dependent refractive index of magnetic fluid （MF） in bulk. The measured refractive index decreases significantly with the increasing magnetic strength and then tends to saturate in the high intensity range. By applying a tunable magnetic field ranging between 0 and 1661 Oe, the maximum shift of the refractive index of MF in bulk is found to be 0.0231.

关键词： Laser sources Magnetic fields Magnetic fluids optical testing Refractive index Tunable filters

Towards an intelligent photonic system

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Science China(Information Sciences) 2020年第6期63卷 80-96页

作者： Weiwen ZOU Bowen MA Shaofu XU Xiuting ZOU Xingjun WANG state key laboratory of advanced optical communication systems and networks Intelligent Microwave Lightwave Integration Innovation Center (iMLic) Department of Electronic EngineeringShanghai Jiao Tong University state key laboratory of advanced optical communication systems and networks School of Electronics Engineering and Computer Science Peking University

The emerging intelligence technologies represented by deep learning have broadened their applications to various fields. Beyond the conventional electronics-based processing systems, the convergence of photonics and artificial intelligence(AI) technology enhances the performance and learning ability of AI. In this review, we propose the concept of an intelligent photonic system(IPS), illustrating it as a developing architecture with three different versions. For each version of IPS, we review several representative *** we discuss the challenges towards an IPS and provide some prospects for the future development.

关键词： intelligent photonic system deep learning artificial intelligence optical neural network neuromorphic photonics

Broadband polarization beam splitter based on a negative refractive lithium niobate photonic crystal slab

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Chinese Optics Letters 2016年第4期14卷 69-72页

作者：段斯琪陈玉萍李广珍朱传义陈险峰 Department of Physics and Astronomy Shanghai Jiao Tong UniversityState Key Laboratory of Advanced Optical Communication Systems and Networks

Using a lithium niobate （LN） material, we propose a broadband polarization beam splitter （PBS） with high efficiency by employing a negative refractive photonic crystal （PhC） wedge slab with an angle of 60°. It can split the incident light into two parts at about 90° with TE and TM polarizations. The transmissions of polarized light for an LN-based PBS are more than 80% with a broad angle and wavelength bandwidth of 8° and 70 nm at 1.55μm, while with a Si-based PhC, no PBS with high efficiency can be realized for the relatively lower transmission of TM output light.

关键词： Efficiency Light sources Niobium compounds optical instruments Photonic crystals Polarization Prisms Refractive index

Dual waveband generator of perfect vector beams

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Photonics Research 2019年第11期7卷 1340-1344页

作者： HUI LI HAIGANG LIU XIANFENG CHEN state key laboratory of advanced optical communication systems and networks School of Physics and AstronomyShanghai Jiao Tong University

Recently, the perfect vector(PV) beam has sparked considerable interest because its radius is independent of the topological charge(TC), which has demonstrated special capabilities in optical manipulation, microscopy imaging, and laser micromachining. Previous research about the generation and manipulation of such PV beams only focuses on the linear optical fields. Therefore, the generation of nonlinear PV beams is still lacking. Here, we propose a dual waveband generator to simultaneously generate the PV beams in linear and nonlinear *** our experiment, PV beams with different polarization states are realized. It is proved that the polarization states of the generated PV beams can be flexibly adjusted by changing the axis direction of a half wave plate. The experimental results show that the radii of the generated PV beams are equal and independent of the *** proper alteration of the nonlinear crystals, this approach could be further extended to other nonlinear processes, such as sum-frequency generation and difference-frequency generation.

关键词： wave generator perfect

Impact of optical–electrical conversion responsivity in sub-sampled photonic analog-to-digital converter

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Chinese Optics Letters 2019年第4期17卷 34-38页

作者： Fan Yang Weiwen Zou Lei Yu Shaofu Xu Jianping Chen state key laboratory of advanced optical communication systems and networks Department of Electronic Engineering Shanghai Jiao Tong University

This Letter investigates the impact of the photodiode(PD) saturation in a sub-sampled photonic analogto-digital converter(PADC) with two individual pulse lasers. It is essentially proved that when the optical power to the saturated PD increases, the optical–electrical conversion(OEC) responsivity and digitized output power of the PADC decrease. If femtosecond pulses are employed for the PADC sampling clock, the time-stretching process in a dispersive medium is necessary to decrease the impact of the PD saturation. In contrast, when the sampling clock with picosecond pulses is utilized, the PD saturation is more tolerable, and thus, the OEC responsivity can be improved by an increase of the optical power to the PD no matter if the time-stretching process is employed.

关键词： optical converter Impact impact pulse is PD OEC

All-optical logic gates and a half-adder based on lithium niobate photonic crystal micro-cavities

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Chinese Optics Letters 2019年第7期17卷 75-77页

作者： Chenghao Lu Bing Zhu Chuanyi Zhu Licheng Ge Yian Liu Yuping Chen Xianfeng Chen state key laboratory of advanced optical communication systems and networks School of Physics and AstronomyShanghai Jiao Tong University

All-optical logic gates including AND, XOR, and NOT gates, as well as a half-adder, are realized based on twodimensional lithium niobate photonic crystal(PhC) circuits with Ph C *** proposed all-optical devices have an extinction ratio as high as 23 dB due to the effective all-optical switch function induced by twomissing-hole *** proposed devices can have potential implementation of complex integrated optical functionalities including all-optical computing in a lithium niobate slab or thin film.

关键词： All-optical logic gates a half-adder crystal micro-cavities

Performance enhancement of Brillouin optical correlation domain analysis based on frequency chirp magnification

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Chinese Optics Letters 2017年第12期15卷 11-14页

作者：王彬樊昕昱杜江兵何祖源 state key laboratory of advanced optical communication systems and networks Shanghai Jiao Tong University Shanghai 200240 China

We propose a method to enhance the performance of Brillouin optical correlation domain analysis （BOCDA） with a broad chirp span of optical sources based on the frequency chirp magnification technique. In BOCDA systems, the number of effective sensing points is proportional to the chirp span of the light source, which is normally limited by the characteristics of the laser diode. We demonstrate a chirp span of 126 GHz with the proposed method, to double the effective sensing points of BOCDA. By combining with differential measurement schemes, a spatial resolution of 〈10 cm over a 1 km range is achieved.

关键词： FWM FCM

Upstream dispersion management of 25 Gb/s duobinary and PAM-4 signals to support 0–40 km differential reach

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Chinese Optics Letters 2017年第2期15卷 78-82页

作者：计红林义理林薛雷胡卫生 state key laboratory of advanced optical communication systems and networks Shanghai Jiao Tong University Shanghai 200240 China

We extensively discuss 25 Gb/s per wavelength capacity in both IEEE and ITU-T standardization to support the increasing bandwidth requirement. In this Letter, we propose to use the optical dispersion compensation technique in an optical line terminal（OLT） combined with a bandwidth-limited electro-absorption modulated laser in an optical network unit to achieve 25 Gb/s capacity for the upstream link. We evaluate the positive and negative dispersion tolerances of 25 Gb/s electrical duo-binary（EDB） and pulse-amplitude modulation（PAM-4） signals. We achieve 39.5 and 31 d B upstream loss budgets for the 25 Gb/s EDB and PAM-4 signals by using-600 and-500 ps∕nm optical dispersion compensation in OLT, respectively, both supporting 0–40 km differential reach.

关键词： Bandwidth Budget control Dense wavelength division multiplexing Dispersion (waves) Dispersion compensation