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Science China(Information Sciences) 2024年第3期67卷 271-280页

作者： Shuiying XIANG Shuang GAO Yuechun SHI Yuna ZHANG Ziwei SONG Xingxing GUO Yahui ZHANG Yuxin MA xiangfei chen State Key Laboratory of Integrated Service Networks Xidian University Yongjiang Laboratory 3. College of Engineering and Applied Sciences Nanjing University

We proposed and experimentally demonstrated a simple and novel photonic spiking neuron based on a distributed feedback(DFB) laser subject to side-mode optical pulse injection(SMOPI). The DFB laser chip is designed and fabricated based on asymmetric equivalent π phase shift(π-EPS) with the reconstruction-equivalent-chirp(REC) technique. Under side-mode continuous-wave(CW) optical injection,excitability pulse was experimentally observed during the dominant mode switching process due to the injection-locked effect. Based on the transition between the excitability regime and the side-mode injection locking effect, the controllable and repeatable neuron-like spiking response can be realized when external stimulus pulses are electro-optically modulated on the CW optical carrier. The experimental results show that the spike threshold, temporal integration, and refractory period, which are important spike processing mechanisms in biological neurons, can all be achieved in the optically-injected DFB laser. The experimental findings are also verified numerically with a rate equation model that considers the SMOPI. To the best of our knowledge, this is the first experimental demonstration of a photonic spiking neuron based on a DFB laser subject to SMOPI, which holds promise for realizing large-scale photonic spiking neuron arrays for hardware photonic spiking neural network chips.

关键词： neuromorphic photonics photonic spiking neuron DFB laser side-mode optical pulse injections

Hybrid-integrated 200 Gb/s REC-DML array transmitter based on photonic wire bonding technology

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Chinese Optics Letters 2024年第8期22卷 64-69页

作者： Yuxin Ma Jie Zhao Tongtong Yang Yipeng Mei Zhenxing Sun Jun Lu Shaobo Li Xiang Ma xiangfei chen Key Laboratory of Intelligent Optical Sensing and Manipulation of the Ministry of Education&National Laboratory of Solid State Microstructures&College of Engineering and Applied Sciences&Institute of Optical Communication Engineering&Nanjing University-Tongding Joint Lab for Large-Scale Photonic Integrated Circuits Nanjing UniversityNanjing 210023China Optical Communication Research and Development Center 54th Research Institute of China Electronics Technology Group CorporationShijiazhuang 050081China

An 8-channel hybrid-integrated chip for 200 Gb/s(8×25 Gb/s)signal transmission has been *** channels are all within the O-band,and with a spacing of 800 *** core of this chip is a monolithic integrated multi-wavelength laser array of 8 directly-modulated distributed feedback(DFB)*** using the reconstruction equivalent chirp technique,multi-wavelength integration and asymmetric phase shift structures are achieved in the laser *** output laser beams of the array are combined by a planar light-wave circuit,which is hybrid-integrated with the laser array by photonic wire *** results of this transmitter chip show good single-mode working of each unit laser,with a sidemode suppression ratio above 50 dB,and the modulation bandwidth is above 20 *** eye diagrams are obtained in the lasers for 25 Gb/s non-return-to-zero modulation,which implies a total 200 Gb/s transmission rate for the whole chip.

关键词： direct modulation laser array reconstruction equivalent chirp photonic wire bonding hybrid integration

Programmable photonic RF filters based on an integrated Fabry-Pérot laser with a saturable absorber

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Chinese Optics Letters 2024年第2期22卷 214-220页

作者：徐真真刘奕彤刘嘉慧王玲孙文韬孙振兴陈向飞 Key Laboratory of Intelligent Optical Sensing and Manipulation of the Ministry of Education&National Laboratory of Solid State Microstructures&College of Engineering and Applied Sciences&Institute of Optical Communication Engineering&Nanjing University-Tongding Joint Lab for Large-Scale Photonic Integrated Circuits Nanjing UniversityNanjing 210023China

We propose and experimentally demonstrate the programmable photonic radio frequency(RF)filters based on an integrated Fabry-Pérot laser with a saturable absorber(FP-SA).Owing to the high output power and the relative flatness spectrum of the FP-SA laser,only a waveshaper and an erbium-doped fiber amplifier(EDFA)were needed,which can greatly reduce the complexity of the *** sinc filter employed 87 taps,representing a record-high tap number and resulting in a 3-d B bandwidth of 0.27 GHz and a quality factor of ***,Gaussian apodization enabled the out-of-band rejection of the filter to reach 34 d B and the center frequency to be finely tuned over a wide range,spanning from 4 to 14 *** results indicate that the proposed scheme could provide a promising guideline for the photonic RF filters that demand both high reconfigurability and greatly reduced size and complexity.

关键词： microwave filters microwave photonics passively mode-locked laser

基于高阶边带注入法布里-珀罗激光器的多路线性扫频光源

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中国激光 2024年第14期51卷 109-117页

作者：王文轩廉安李连艳张云山颜雅西余长源陈向飞江苏科技大学海洋学院江苏镇江212003 香港理工大学电机与电子工程学系中国香港999077 南京邮电大学电子与光学工程学院、柔性电子(未来技术)学院江苏南京210023 南京大学智能光感知与调控技术教育部重点实验室江苏南京210023

基于高阶边带调制和光注入法布里-珀罗(F-P)激光器的波长选择性放大理论,设计并实现了一种具有较宽扫频范围和较窄线宽特性的多路线性扫频光源(SOS)。由窄线宽激光器阵列产生的多个光波经过线性扫频电信号调制后,产生多路高阶边带扫频... 详细信息

基于高阶边带调制和光注入法布里-珀罗(F-P)激光器的波长选择性放大理论,设计并实现了一种具有较宽扫频范围和较窄线宽特性的多路线性扫频光源(SOS)。由窄线宽激光器阵列产生的多个光波经过线性扫频电信号调制后,产生多路高阶边带扫频光信号。利用同步电流补偿,将光信号注入并锁定F-P激光器的多个纵模,经放大边带信号后能获得多路线性扫频光源。实验使用了4个窄线宽激光器,将光信号注入F-P激光器锁定三阶边带,可以同时产生4路线性扫频光源,其扫频范围和扫频速率比一阶边带数值提高了3倍,分别为39.8~44.2 GHz和9.28 THz/s,实现线性度超过99.9992%和线宽低于1 kHz。所提结构可以应用于调频连续波(FMCW)激光雷达和光频域反射(OFDR)分布式光纤传感。

关键词：法布里-珀罗激光器光电器件线性扫频高阶调制光注入

Stability-enhanced RF signal transmission over long fiber-optic links

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Chinese Optics Letters 2024年第5期22卷 131-136页

作者：尹知谦郑满航张川博管世健周昕刘奕彤刚泽宇聂佳强张云山朱兴邦方涛陈向飞 Engineering Research Center of Precision Photonics Integration and System Application Ministry of Education&Key Laboratory of Intelligent Optical Sensing and ManipulationMinistry of Education&National Laboratory of Solid State Microstructures&College of Engineering and Applied Sciences&Institute of Optical Communication Engineering&Nanjing University-Tongding Joint Lab for Large-scale Photonic Integrated CircuitsNanjing UniversityNanjing 210023China College of Electronics and Optical Engineering and College of Flexible Electronics(Future Technology) Nanjing University of Posts and TelecommunicationsNanjing 210023China The 41st Research Institute of China Electronics Technology Group Corp Qingdao 266000China

We propose a method for optimizing the phase stability of microwave signal transmission over long ***,the design of the photon link was modified to reduce the radio frequency(RF)signal’s baseline noise and increase ***,a low-noise driver circuit was developed for a two-section distributed feedback(DFB)laser designed using reconstruction equivalent chirp(REC)technology to create an ultra-stable laser,and its performance was characterized through linewidth *** results indicate that the DFB laser achieved narrower linewidth,improving system phase *** an injection current(30 mA)is applied to the reflection section of the two-section DFB laser,the laser linewidth will be narrower(1.38 MHz),further enhancing the system’s phase transmission *** a 1 Hz offset frequency,a residual phase noise of-88.65 dBc/Hz is *** short-term stability with an averaging time of 1 s is 1.60×10^(-14),and the long-term stability over a testing time of 60,000 s is 3.41×10^(-18).Even after incorporating temperature variations,the long-term stability reaches 8.37×10^(-18) at 22 h.

关键词： frequency dissemination two-section distributed feedback laser phase stability

First demonstration of 1.3μm quarter-wavelength shift distributed feedback(DFB) semiconductor laser based on conventional photolithography

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Science China Technological Sciences 2013年第3期56卷 554-557页

作者： LU LinLin SHI YueChun chen xiangfei National Laboratory of Solid State Microstructures & School of Engineering and Applied Sciences Nanjing University

A 1.3 μm distributed feedback(DFB) semiconductor laser with equivalent λ/4 phase shift based on reconstruction equivalent chirp(REC) technique is numerically studied and experimentally *** simulation results show that the 1.3 μm DFB laser with equivalent λ/4 phase shift based on the REC technique performs the same as that of actual λ/4 phase shift DFB laser,with nearly the same P-I curves,the internal power distributions and the output ASE *** with the traditional λ/4 phase shift DFB laser,the REC based laser only changes the sampling structures with the uniform seed waveguide grating instead of the actual grating *** a result,the fabrication of such laser will be very *** this paper,we successfully fabricated the 1.3 μm DFB laser based on the REC technique for the first time to the best of our knowledge.

关键词： λ/4 phase shift distributed feedback(DFB) semiconductor laser reconstruction equivalent chirp(REC) technique

Transient mode competition in directly modulated DFB semiconductor laser

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Science China(Physics,Mechanics & Astronomy) 2015年第12期58卷 187-192页

作者： XIAO RuLei SHI YueChun ZHENG JiLin ZHANG YunShan ZHENG JunShou chen xiangfei National Laboratory of Solid State Microstructures Collaborative Innovation Center of Advanced Microstructures and College of Engineering and Applied Sciences Nanjing University Photonics Information Technology Laboratory Institute of Communication Engineering PLA University of Science and Technology

A new effect of transient mode competition in directly modulated DFB laser based on equivalent phase-shift （EPS） technique is presented and studied. Since there are multi-order reflections in EPS structure and if the 0th order subgrating is properly de- signed, the transient lasing of 0th order will occur during the rising time of the injection current. As a result, transient mode competition between -lst order （main mode） and 0th order will occur accordingly. This can consume redundant carrier and suppress the transient relaxation oscillation, which may be applied in some areas like on-off switching modulation of DFB semiconductor lasers. As an example, an equivalent n phase shift （n-EPS） is carefully designed to realize the effect. In such a laser the 0th order wavelength is in the margin of the material gain region and the -1st order wavelength is around the gain peak, while the stable single longitudinal mode （SLM） operation of the -lst order is guaranteed. The simulation investigation is performed. Good results with suppressed relaxation oscillation and 1.25 Gb/s directly on-off modulation （32 dB extinction ratio） are demonstrated. We believe it provides a new kind of method for on-off switching with high extinction ratio and weak relaxation oscillation.

关键词： DFB semiconductor laser mode competition relaxation oscillation sampled grating

Periodic structural defects in Bragg gratings and their application in multiwavelength devices

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Photonics Research 2016年第2期4卷 35-40页

作者： Rulei Xiao Yuechun Shi Renjia Guo Ting chen Lijun Hao xiangfei chen National Laboratory of Solid State Microstructures Collaborative Innovation Center of Advanced Microstructures and College of Engineering and Applied Sciences Nanjing University

In this paper, we present the finding that periodic structural defects(PSDs) along a Bragg grating can shift the Bragg wavelength. This effect is theoretically analyzed and confirmed by numerical calculation. We find that the Bragg wavelength shift is determined by the defect size and the period of the defects. The Bragg wavelength can be well tuned by properly designing the PSDs, and this may provide an alternative method to fabricate grating-based multiwavelength devices, including optical filter arrays and laser arrays. In regards to wavelength precision, the proposed method has an advantage over the traditional methods, where the Bragg wavelengths are changed directly by changing the grating period. In addition, the proposed method can maintain grating strength when tuning the wavelength since only the period of defects is changed. This will be a benefit for devices such as arrays.

关键词： Periodic structural defects in Bragg gratings and their application in multiwavelength devices RGS

Numerical study of three phase shifts and dual corrugation pitch modulated(CPM) DFB semiconductor lasers based on reconstruction equivalent chirp technology

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Chinese Science Bulletin 2010年第35期55卷 4083-4088页

作者： SHI YueChun TU XingHua LI SiMin ZHOU YaTing JIA LingHui chen xiangfei Microwave-Photonics Technology Laboratory National Laboratory of Microstructures Nanjing University Nanfing 210093 China Department of Electronic Science and Engineering Nanjing University Nanjing 210093 China Microfluidics and Optics Technology Research Center College of Opto-Electronic Engineering Nanjing University of Posts and Telecommunication Nanfing 210003 China

A distributed feedback(DFB) semiconductor laser with three phase shifts based on reconstruction equivalent chirp(REC) technology is proposed and investigated *** the combination of multiple phase shifts and corrugation pitch modulated(CPM) structure,we also propose a novel and more complex structure named dual CPM,which has a flatter light power distribution along the laser cavity compared with the true double phase shifts DFB laser diode(LD),while the P-I curves are nearly the *** proposed dual CPM structure is also designed and analyzed based on REC *** simulation results show that,the DFB semiconductor laser with complex structure such as phase shifts,or even arbitrary variation of the grating period can be achieved equivalently and easily by changing the sampling *** its external characteristics are almost the same as those DFB lasers with true phase shifts,or true arbitrary variation of the grating *** key advantage of the REC technology is that it varies only the sampling structure and keeps the seed grating(actual grating in sampling structure) period *** its fabrication needs only low-cost and standard holographic exposure *** we believe this method can achieve the high-end and low-cost DFB LD for mass production.

关键词：半导体激光器等效采样拍摄技术数值研究 CPM 啁啾重构基础

Research Progress on Ocular Surface Changes after Femtosecond Laser Small IncisionLenticule Extraction

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Eye Science 2015年第1期30卷 48-52页

作者： xiangfei chen Yan Lu Chunhong Wang Zhenping Huang Medicine School of Nanjing University Nanjing General Hospital of Nanjing Military Command of PLA

The femtosecond laser has a number of advantages,.such as short pulse time,.high instantaneous power,.high repetition rate, low monopulse energy, and small thermal effect. Femtosecond laser-assisted small incision lenticule extraction(SMILE) is becoming the new direction in refractive surgery,and the ocular surface changes after SMILE are attracting increasingly more attention. This article reviews adverse effects,including dry eye, injury of corneal nerves, and ocular surface inflammation,.occurring after SMILE.

关键词：飞秒激光 SMILE 提取脉冲时间瞬时功率高重复率脉冲能量激光辅助