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Photonic crystal-connected bidirectional micro-ring resonator array for duplex mode and wavelength channel(de)multiplexing

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Photonics Research 2024年第8期12卷 1802-1812页

作者： ZHIWEI GUAN CHAOFENG WANG CHUANGXIN XIE HAISHENG WU JUNMIN LIU HUAPENG YE dianyuan fan JIANGNAN XIAO SHUQING CHEN International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology Institute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518060China College of Physics and Engineering Technology Minzu Normal University of XingyiXingyi 562400China College of New Materials and New Energies Shenzhen Technology UniversityShenzhen 518118China Guangdong Provincial Key Laboratory of Optical Information Materials and Technology and Institute of Electronic Paper Displays South China Academy of Advanced OptoelectronicsSouth China Normal UniversityGuangzhou 510006China Terahertz Technology Innovation Research Institute Shanghai Key Laboratory of Modern Optical SystemTerahertz Science Cooperative Innovation CenterSchool of Optical-Electrical Computer EngineeringUniversity of Shanghai for Science and TechnologyShanghai 200093China

The progress of on-chip optical communication relies on integrated multi-dimensional mode(de)multiplexers to enhance communication capacity and establish comprehensive ***,existing multi-dimensional(de)multiplexers,involving modes and wavelengths,face limitations due to their reliance on single-directional total internal reflection and multi-level mode conversion based on directional coupling *** constraints restrict their potential for full-duplex functionality and highly integrated *** solve these problems by introducing a photonic-like crystal-connected bidirectional micro-ring resonator array(PBMRA)and apply it to duplex mode-wavelength multiplexing *** directional independence of total internal reflection and the cumulative effect of the subwavelength-scale pillar within the single-level photonic crystal enable bidirectional mode and wavelength multiplexed signals to transmit among multi-pair nodes without interference,improving on-chip integration in single-level mode *** a proof of concept,we fabricated a nine-channel bidirectional multi-dimensional(de)multiplexer,featuring three wavelengths and three TE modes,compactly housed within a footprint of 80μm×80μm,which efficiently transmits QPSK-OFDM signals at a rate of 216 Gbit/s,achieving a bit error rate lower than 10^(-4).Leveraging the co-ring transmission characteristic and the orthogonality of the mode-wavelength channel,this(de)multiplexer also enables a doubling of communication capacity using two physical transmission channels.

关键词： resonator channel mode

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Mode Multiplication of Cylindrical Vector Beam Using Raytracing Control

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Chinese Physics Letters 2024年第9期41卷 40-51页

作者： Jing Wang Qingji Zeng Haisheng Wu Chuangxin Xie Huapeng Ye Ze Dong dianyuan fan Shuqing Chen Institute of Microscale Optoelectronics Shenzhen UniversityShenzhen 518060China Guangdong Provincial Key Laboratory of Optical Information Materials and Technology and Institute of Electronic Paper DisplaysSouth China Academy of Advanced OptoelectronicsSouth China Normal UniversityGuangzhou 510006China School of Information and Electronics Beijing Institute of TechnologyBeijing 100081China

Cylindrical vector beams(CVBs)hold significant promise in mode division multiplexing communication owing to their inherent vector mode ***,existing studies for facilitating CVB channel processing are confined to mode shift conversions due to their reliance on spin-dependent helical modulations,overlooking the pursuit of mode multiplication *** challenge lies in the multiplicative operation upon inhomogeneous vector mode manipulation,which is expected to advance versatile CVB channel switching and ***,we tackle this gap by introducing a raytracing control strategy that conformally maps the light rays of CVB from the whole annulus distribution to an annular sector *** with the multifold conformal annulus-sector mappings and polarization-insensitive phase modulations,this approach facilitates the parallel transformation of input CVB into multiple complementary components,enabling the mode multiplication conversion with protected vector *** as a demonstration,we experimentally implemented the multiplicative operation of four CVB modes with the multiplier factors of𝑁N=+2 and N=−3,achieving the converted mode purities over 94.24%and 88.37%.Subsequently,200 Gbit/s quadrature phase shift keying signals were successfully transmitted upon multiplicative switching of four CVB channels,with the bit-error-rate approaching 1×10−*** results underscore our strategy’s efficacy in CVB mode multiplication,which may open promising prospects for its advanced applications.

关键词： structure. multiplicative approaching

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Harpoon-shaped topological photonic crystal for on-chip beam splitter

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Science China(Physics,Mechanics & Astronomy) 2024年第9期67卷 91-98页

作者： Zhiwei Guan Ruixue Dou Chuangxin Xie Tianyimei Zuo Liyu Huang Keyin Wen Chaofeng Wang Huapeng Ye Junmin Liu Ze Dong dianyuan fan Shuqing Chen Institute of Microscale Optoelectronics Shenzhen UniversityShenzhen 518060China College of Physics and Engineering Technology Minzu Normal University of XingyiXingyi 562400China Guangdong Provincial Key Laboratory of Optical Information Materials and Technology and Institute of Electronic Paper Displays South China Academy of Advanced OptoelectronicsSouth China Normal UniversityGuangzhou 510006China College of New Materials and New Energies Shenzhen Technology UniversityShenzhen 518118China School of information and Electronics Beijing Institute of TechnologyBeijing 100081China

The advancement of integrated optical communication networks necessitates the deployment of on-chip beam splitters for efficient signal interconnections at network ***,the pursuit of micron-scale beam splitting with large corners and reducing the device footprint to boost connection flexibility often results in phase *** mismatches,which stem from radiation modes and backward scattering,pose significant obstacles in creating highly integrated and interference-resistant *** address this,we introduce a solution based on the topological valley-contrasting state generated by photonic crystals with opposing valley Chern numbers,manifested in a harpoon-shaped structure designed to steer the splitting *** approach enables adiabatic mode field evolution over large corners,capitalizing on the robust phase modulation capabilities and topological protection provided by the subwavelength-scale valley-contrasting *** demonstration reveals that beam splitters with large corners of 60°,90°,and 120°exhibit insertion loss fluctuations below 2.7 dB while maintaining a minimal footprint of 8.8μm×8.8μ*** a practical demonstration,these devices facilitate three-channel signal connections,successfully transmitting quadrature phase shift keying signals at 3.66 Tbit/s with bit error rates below the forward error correction threshold,demonstrating performance comparable to that in defects *** harnessing the unidirectional excitation feature,we anticipate significant enhancements in the capabilities of signal distribution and connection networks through a daisy chain configuration.

关键词： channel interconnection on-chip beam splitter topological valley-contrasting state

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百瓦级中红外光纤随机激光放大

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中国激光 2024年第5期51卷 12-18页

作者：高旺城马瑞全欣陈宇范滇元刘军深圳大学微纳光电子学研究院二维材料光电科技国际合作联合实验室广东深圳518060 中国科学院高功率激光物理重点实验室上海201800

中红外波段高功率激光光源在工业加工和生物医疗等领域中有着广泛的应用。报道了基于主振荡器功率放大器(MOPA)结构的百瓦级中红外连续波光纤随机激光器,获得了最高输出功率为100.40 W、斜率效率为47.8%、波长为1980 nm的连续波激光输... 详细信息

中红外波段高功率激光光源在工业加工和生物医疗等领域中有着广泛的应用。报道了基于主振荡器功率放大器(MOPA)结构的百瓦级中红外连续波光纤随机激光器,获得了最高输出功率为100.40 W、斜率效率为47.8%、波长为1980 nm的连续波激光输出。得益于MOPA结构中光纤随机激光种子源在激光放大过程中的光谱带宽保持特性,100.40 W激光输出时的3 dB光谱带宽仅为~0.2 nm。激光器的短时时域强度波动和长时功率波动均表现出优良的稳定性。所提实验技术方案和实验结果有望进一步拓宽中红外高功率光纤随机激光器的应用范围。

关键词：激光器光纤随机激光器高功率激光器瑞利散射中红外激光器高稳定性

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Characteristics and geometry optimization of a hollow cone for guiding and focusing laser light

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Science China(Physics,Mechanics & Astronomy) 2012年第2期55卷 204-212页

作者： ZENG XiaHui fan dianyuan Department of Physics&Electronic Information Engineering Minjiang UniversityFuzhou 350108China Shanghat Instinute of Opttcs and Free Mechantcs Chinese Academy of SciencesShanghai 201800China

A highly focused beam with spot radius of around 1 ktm and enhanced light intensity is obtained by using an open hollow cone. Two-dimensional and three-dimensional finite-difference time-domain simulations are performed for clarifying light propagation characteristics and the cone geometry dependence of the cone-focused laser light. Two important parameters characterizing the cone-focusing effect are introduced, which are opening angle and cone tip size. By changing these parameters, the laser intensification, field spatial distribution at the cone tip and the near-field transmission can be controlled. Understanding this is quite important in designing the optimum cone shape for fast ignition and determining the basis for using hollow cone targets as devices for generating high energy charged particles.

关键词： laser beam focusing hollow cone finite-difference time-domain (FDTD) method

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Incoherent radiation of amplifying random media

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Frontiers of Optoelectronics 2008年第Z1期1卷 95-100页

作者： Yunxia YE dianyuan fan College of Mechanical Engineering Jiangsu University Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences

Incoherent radiation of amplifying random media was investigated using Monte Carlo simulation and the characteristics of random laser were *** entire emission spectra of the random media would become narrow abruptly when pumping energies exceeded certain threshold values, and as the pumping energies further increased, distinct sharp peaks would emerge on the spectrum background. The intensity of a certain spatial point within the scattering media was contributed from emissions of many frequencies. The intensity of a single frequency of the entire spectrum was contributed with emissions from wide spatial location and angle ranges. It has been pointed out that the incoherent radiation of amplifying random media is essentially different from amplified spontaneous emission without any feedback as well as conventional resonant-feedback laser. The explanation on distinct sharp peaks is that rare photons have experienced rather more scattering events and walked longer paths in amplifying random media, which accumulates more gain for these photons.

关键词： random laser incoherent radiation Monte Carlo scatter

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A CW seeded femtosecond optical parametric amplifier

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Science China(Physics,Mechanics & Astronomy) 2004年第6期47卷 767-772页

作者： ZHU Heyuan XU Guang WANG Tao QIAN Liejia fan dianyuan State Key Laboratory for Advanced Photonic Materials & Devices Department of Optical Science and Engineering Fudan University Shanghai 200433 China

A CW seeded femtosecond optical parametric amplifier, a compromise between OPG/OPA and strongly seeded OPA configurations, has been demonstrated. An independent CW Nd︰YAG laser with sub-watt power decreases the pump threshold of the OPA and improves the stability of the output pulses considerably. Output signal energies as high as 30 μJ with pulse durations less than 250 fs near 1 μm are reported from this two-stage device.

关键词： femtosecond CW seeded optical parametric amplification.

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A terawatt Nd:glass chirped pulse amplification laser system seeded by two order optical parametric amplification

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Science China(Physics,Mechanics & Astronomy) 2012年第5期55卷 776-780页

作者： ZHANG LiFu FU XiQuan DENG JianQin ZHANG Jin WEN ShuangChun fan dianyuan Key Laboratory for Micro-/Nano-Optoelectronic Devices of Ministry of Education and College of Information Science and Engineering Hunan University Changsha 410082 China College of Electrical Engineering Anhui Polytechnic University Wuhu 241000 China

We present the performance of a high-power Nd:glass laser system,which produces a 1.1 J,250 fs,7.3 nm broadband laser pulse based on the combination of optical parametric amplification(OPA) and chirped pulse amplification(CPA).The two-stage OPA provides broadband seed pulses for the three-stage Nd:glass amplifiers based on the technology of *** to the conventional oscillator seed source,the most important advantage of such a seed source supplied by the two-stage OPA is that it possesses the capacities of broad bandwidth and high energy.

关键词： broadband laser pulse optical parametric amplification (OPA) chirped pulse amplification (CPA)

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Cylindrical vector beam multiplexer/demultiplexer using off-axis polarization control

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Light(Science & Applications) 2021年第12期10卷 2360-2368页

作者： Shuqing Chen Zhiqiang Xie Huapeng Ye Xinrou Wang Zhenghao Guo Yanliang He Ying Li Xiaocong Yuan dianyuan fan Institute of Microscale Optoelectronics Shenzhen University518060 ShenzhenChina Guangdong Provincial Key Laboratory of Optical Information Materials and Technology&Institute of Electronic Paper Displays South China Academy of Advanced OptoelectronicsSouth China Normal University510006 GuangzhouChina

The emergence of cylindrical vector beam(CVB)multiplexing has opened new avenues for high-capacity optical *** several configurations have been developed to couple/separate CVBs,the CVB multiplexer/demultiplexer remains elusive due to lack of effective off-axis polarization control *** we report a straightforward approach to realize off-axis polarization control for CVB multiplexing/demultiplexing based on a metal–dielectric–metal *** show that the left-and right-handed circularly polarized(LHCP/RHCP)components of CVBs are independently modulated via spin-to-orbit interactions by the properly designed metasurface,and then simultaneously multiplexed and demultiplexed due to the reversibility of light path and the conservation of vector *** also show that the proposed multiplexers/demultiplexers are broadband(from 1310 to 1625 nm)and compatible with *** a proof of concept,we successfully demonstrate a four-channel CVB multiplexing communication,combining wavelength-division-multiplexing and polarization-division-multiplexing with a transmission rate of 1.56 Tbit/s and a bit-error-rate of 10^(−6) at the receive power of−21.6 *** study paves the way for CVB multiplexing/demultiplexing and may benefit high-capacity CVB communication.

关键词： polarization beam properly

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Generation of ultrafast radially polarized pulses through chirp-assisted femtosecond optical parametric amplification

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Science China(Physics,Mechanics & Astronomy) 2022年第5期65卷 51-57页

作者： SaiSai Hu JieFeng Huang XinHao Ren ChangWen Xu ShiXiang Xu dianyuan fan HaiZhe Zhong International Collaborative Laboratory of 2D Materials for Optoelectronic Science&Technology of Ministry of Education Institute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518060China Shenzhen Key Laboratory of Micro-Nano Photonic Information Technology College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China

Radially polarized beams characterized by an axially symmetric polarization distribution can be sharply focused to produce strong longitudinal fields in the *** applications of these beams will be facilitated by the availability of higher powers and shorter ***,the ultrafast radially polarized pulse is typically generated via wavefront reconstruction from conventional linearly polarized *** pulse duration and intensity limits are strictly dependent on extra-cavity ***,a chirp-assisted near-degenerate type-II parametric process is presented as a pulse-energy-scalable method of accessing ultrafast radially polarized *** a proof-of-principle experiment,the broadband gain balance between the orthogonally polarized signal components was realized via controlling the chirp of the pump *** an analogous pulseduration transfer effect,the radially polarized signal inherited the temporal and spectral characteristics of the pump pulse and maintained the radial polarization state of each frequency component of the *** a shorter pump pulse,the generation of few-cycle radially polarized pulses should be achievable,which may facilitate a wide range of ultrafast applications such as vacuum electron acceleration and high-harmonic generation.

关键词： radially polarized beam optical parametric amplifier ultrafast lasers spectral broadening optical parametric phase

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