Author Affiliations
Abstract
1 Faculty of Electrical Engineering and Computer Science, Ningbo University, Ningbo 315211, China
2 College of Electrical and Electronic Engineering, Wenzhou University, Wenzhou 325035, China
3 College of Science and Technology, Ningbo University, Ningbo 315300, China
4 Laboratory of Infrared Materials and Devices, The Research Institute of Advanced Technologies, Ningbo University, Ningbo 315211, China
5 Department of Information Science and Electronics Engineering and Cyrus Tang Center for Sensor Materials and Applications, Zhejiang University, Hangzhou 310027, China
A flexible-grid 1×(2×3) mode- and wavelength-selective switch which comprises counter-tapered couplers and silicon microring resonators has been proposed, optimized, and demonstrated experimentally in this work. By carefully thermally tuning phase shifters and silicon microring resonators, mode and wavelength signals can be independently and flexibly conveyed to any one of the output ports, and different bandwidths can be generated as desired. The particle swarm optimization algorithm and finite difference time-domain method are employed to optimize structural parameters of the two-mode (de)multiplexer and crossing waveguide. The bandwidth-tunable wavelength-selective optical router composed of 12 microring resonators is studied by taking advantage of the transfer matrix method. Measurement results show that, for the fabricated module, cross talk less than -10.18 dB, an extinction ratio larger than 17.41 dB, an in-band ripple lower than 0.79 dB, and a 3-dB bandwidth changing from 0.38 to 1.05 nm are obtained, as the wavelength-channel spacing is 0.40 nm. The corresponding response time is measured to be 13.64 µs.
integrated optics optical waveguide mode- and wavelength-selective switch 
Chinese Optics Letters
2024, 22(1): 011301
林健 1刘雨潇 1符强 3李军 1[ ... ]陈伟伟 1,*
作者单位
摘要
1 宁波大学 信息科学与工程学院,宁波 315211
2 温州大学 电气与电子工程学院,温州 325035
3 宁波大学 科学技术学院,宁波 315300
提出了一种基于锥形渐变耦合结构的可扩展多模弯曲波导。该器件利用模式等效折射率匹配原理,通过对称的锥形渐变耦合结构,实现高阶模式与基模的相互转化,完成多模弯曲传输功能。同时,结合时域有限差分方法和粒子群优化算法,优化锥形渐变耦合结构区域,提升器件性能。实验测试结果表明,在1 520~1 600 nm的波长范围内,当输入模式分别为TE0、TE1、TE2、TE3和TE4时,该器件的插入损耗分别小于1.71 dB、3.04 dB、2.90 dB、3.16 dB和4.00 dB,对应的串扰分别小于-10.60 dB、-11.35 dB、-10.92 dB、-10.35 dB和-11.45 dB。
集成光学 多模弯曲波导 粒子群算法 锥形耦合器 有限时域差分法 Integrated optics Multimode waveguide bend Particle swarm optimization algorithm Tapered coupler Finite difference time domain method 
光子学报
2023, 52(7): 0713001
作者单位
摘要
1 宁波大学信息科学与工程学院,浙江 宁波 315211
2 温州大学电气与电子工程学院,浙江 温州 325035
提出一种相变材料辅助的非易失性硅基偏振不敏感1×2模式光开关,该器件包括偏振分束单元、偏振合束单元、定向耦合结构单元、偏振不敏感交叉波导以及模式转换单元。通过调谐相变材料的晶态与非晶态,可实现偏振不敏感的多模光开关功能。利用粒子群智能算法和时域有限差分法对所提出的器件进行优化并分析其性能。仿真结果表明,在1535~1569 nm波长范围内:输入TE0模式时,所设计器件的插入损耗小于1.37 dB,串扰小于-13.12 dB;输入TM0模式时,所设计器件的插入损耗小于1.61 dB,串扰小于-17.39 dB。
集成光学 硅基光子学 模式光开关 偏振不敏感 非易失性 integrated optics silicon-based photonics optical mode switch polarization-insensitivity non-volatility 
光学学报
2023, 43(11): 1113001
作者单位
摘要
温州大学 电气与电子工程学院,浙江 温州 325035
针对电力线缆分布情况复杂、缺乏全面有效预警手段等问题,提出基于灰色马尔科夫(GM-Markov)模型的线缆温度预警系统。首先分析温度预警系统设计总体结构以及数据通信方式,通过采用LoRa和GPRS相结合的方式,保证数据采集的可靠性;其次,通过灰色马尔科夫模型预测线缆温度,将预测结果用线缆温度预警模型进行故障判断,提高预警系统准确性;最后,通过实验验证线缆温度预警的可行性,并构建线缆温度分级预警平台,实现将各种故障信息及时推送给企业管理人员,达到实时预警的目的。
灰色马尔可夫模型 温度预警模型 预警平台 故障推送 GM-Markov model temperature pre-warning model pre-warning platform fault notification 
太赫兹科学与电子信息学报
2021, 19(6): 1091
作者单位
摘要
1 宁波大学信息科学与工程学院, 浙江 宁波 315211
2 温州大学电气与电子学院, 浙江 温州 325035
虽然传统的Fredkin门可以很好地实现相应的逻辑功能,但是其消光比和串扰还有待进一步改善。鉴于此,本文提出并设计一种基于交叉相位调制效应的硅基全光Fredkin门,该全光可逆逻辑门由两个2×2的定向耦合器、一个2×1的定向耦合器、一个1×2的定向耦合器以及两个相移臂构成。利用泵浦光与信号光在相移臂中引发的交叉相位调制效应,可以改变上、下相移臂中信号光的相位差,从而在所设计器件的不同端口处输出不同幅度的光波,继而实现Fredkin门的逻辑功能。与此同时,利用MATLAB并融入分步傅里叶法对所设计的硅基全光Fredkin门进行仿真分析。仿真结果表明,器件的最差消光比可达48.46 dB。
集成光学 可逆逻辑 硅基光波导 交叉相位调制 Fredkin门 integrated optics reversible logic silicon waveguide cross-phase modulation Fredkin gate 
光学学报
2021, 41(9): 0913001
作者单位
摘要
山西大学光电研究所量子光学与光量子器件国家重点实验室, 山西 太原 030006
对玻色爱因斯坦凝聚中拉曼跃迁的拉比频率和耦合强度进行了实验研究,拉比频率是光与原子相互作用中的一个重要参量,用于衡量原子与光场之间耦合强度的大小,而拉曼跃迁耦合强度是自旋轨道耦合实验中的一个重要参数。研究了不同拉曼光频率失谐下,87Rb在F=1时的超精细塞曼子能态|1,0〉和|1,1〉间的拉曼跃迁拉比振荡。在800 nm的拉曼光作用下,观测到超精细态F=2的5个塞曼能态间同时耦合的拉比振荡。该工作有助于87Rb自旋轨道耦合实验中参数的优化选择。
量子光学 自旋轨道耦合 玻色爱因斯坦凝聚 拉曼跃迁 拉比频率 耦合强度 quantum optics spin-orbit coupling bose-einstein condensate Raman transition Rabi frequency coupling strength 
光学学报
2014, 34(7): 0727002
Author Affiliations
Abstract
State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan 030006, China
We create a Bose-Einstein condensate (BEC) of 87Rb atoms by runaway evaporative cooling in an optical trap. Two crossed infrared laser beams with a wavelength of 1064 nm are used to form an optical dipole trap. After precooling the atom samples in a quadrupole-Ioffe configuration (QUIC) trap under 1.5 \mu K by radio-frequency (RF) evaporative cooling, the samples are transferred into the center of the glass cell, then loaded into the optical dipole trap with 800 ms. The pure condensate with up to 1.5×105 atoms is obtained over 1.17 s by lowering the power of the trap beams.
光学偶极力阱 玻色爱因斯坦凝聚 020.1475 Bose-Einstein condensates 020.7010 Laser trapping 
Chinese Optics Letters
2010, 8(7): 627
Author Affiliations
Abstract
State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan 030006, China
We report the experimental achievement of 87Rb Bose-Einstein condensation in a magnetic trap with microwave and radio frequency (RF) induced evaporation. Evaporative cooling is realized by using 6.8 GHz microwave radiation driving the 87Rb atoms to transit from the ground-state hyperfine state |F = 2,mF =2> to |F = 1,mF = 1>. Compared with RF-induced evaporation, 87Rb atoms are hardly to achieve pure condensate by microwave evaporation cooling due to the effect of atoms in the |F = 1,mF = 1> state being pumped back into the trapping |F = 2,mF = 1> state.
微波蒸发 射频蒸发 玻色爱因斯坦凝聚 020.0020 Atomic and molecular physics 350.4010 Microwaves 
Chinese Optics Letters
2010, 8(4): 351
Author Affiliations
Abstract
State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan 030006, China
We study 87Rb Bose-Einstein condensation (BEC) loading into the pulse of the one-dimensional (1D) optical lattice experimentally. The lattice is turned on abruptly, held constant for a variable time, and then turned off abruptly. The measurement of the depth of the optical lattice is obtained by Kapitza-Dirac scattering. The temporal matter-wave-dispersion Talbot effect with 87Rb BEC is observed by applying a pair of pulsed standing waves (as pulsed phase gratings) with the separation of a variable delay.
玻色爱因斯坦凝聚 光学晶格 Kapitza-Dirac散射 时域Talbot效应 020.1475 Bose-Einstein condensates 020.0020 Atomic and molecular physics 020.1335 Atom optics 140.3290 Laser arrays 
Chinese Optics Letters
2010, 8(4): 348
作者单位
摘要
山西大学 光电研究所量子光学与光量子器件国家重点实验室,山西 太 原 030006
从费米原子俘获在谐振势中出发,采用托马斯费米的半经典近似(Thomas-Fermi approximation),计算了自旋极化费米子的空间分布函数,对费米原子吸收成像的光学密度分布进行拟合,分析得到粒子数,费米温度和实际温度。采用这种方法,对实验中获得的40K费米原子吸收成像的光学密度分布进行拟合,得到了费米气体量子简并参数T/TF。
简并费米气体 托马斯费米近似 费米温度 费米简并气体参数 degenerate Fermi gas Thomas-Fermi approximation Fermi temperature degeneracy parameter of Fermi gas 
光学学报
2010, 30(3): 893

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