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Inverse design of broadband and dispersion-flattened highly GeO2-doped optical fibers based on neural networks and particle swarm algorithm

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Optoelectronics Letters 2025年第6期21卷 328-335页

作者： LI Runrui WANG Chuncan Key Laboratory of All Optical Network and Advanced Telecommunication Network Ministry of Education Institute of Lightwave Technology Beijing Jiaotong University

Reverse design of highly GeO2-doped silica optical fibers with broadband and flat dispersion profiles is proposed using a neural network（NN） combined with a particle swarm optimization（PSO） ***,the NN model designed to predict optical fiber dispersion is trained with an appropriate choice of hyperparameters,achieving a root mean square error（RMSE） of 9.47×10-7on the test dataset,with a determination coefficient（R2） of ***,the NN is combined with the PSO algorithm for the inverse design of dispersion-flattened optical *** expand the search space and avoid particles becoming trapped in local optimal solutions,the PSO algorithm incorporates adaptive inertia weight updating and a simulated annealing ***,by using a suitable fitness function,the designed fibers exhibit flat group velocity dispersion（GVD） profiles at 1 400—2 400 nm,where the GVD fluctuations and minimum absolute GVD values are below 18 ps·nm-1·km-1and 7 ps·nm-1·km-1,respectively.

关键词： A

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A Broadband Leaky-Wave Antenna With High Efficiency Based on Dielectric Ridged Parallel-Plate Waveguide

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IEEE Antennas and Wireless Propagation Letters 2025年第5期24卷 1293-1297页

作者： Zhu, Rui Zhao, Yiming Wang, Junhong Beijing Jiaotong University Key Laboratory of All Optical Network and Advanced Telecommunication Network Ministry of Education Institute of Lightwave Technology Beijing100044 China

A novel leaky-wave antenna (LWA) with wide bandwidth and high efficiency based on dielectric ridged parallel-plate waveguide (DRPW) is proposed. The DRPW is constructed by placing a dielectric ridge into the parallel-plate waveguide, which combines both the wideband property of parallel-plate waveguide and the field confining effect of dielectric ridge. The zero cutoff frequency of DRPW and flexible path design of radiation aperture make it an excellent fundamental waveguide for broadband LWA design. Based on DRPW, an LWA with extraordinary radiation performance is proposed, which achieves a single-beam operating bandwidth of 55.4%, and the simulated total in-band efficiency is over 92%. The antenna can realize a back-to-front scanning range of 67°. The simple structure, low profile and high radiation performance make it a good candidate for wireless communication and detection in millimeter-wave applications. © 2002-2011 IEEE.

关键词： Millimeter waves

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Wideband High-Gain Quad-Polarization Reconfigurable Antenna Using Three-Layered Polarizer

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IEEE Antennas and Wireless Propagation Letters 2025年第5期24卷 1198-1202页

作者： Lu, Zhengrong Li, Yujian Wang, Junhong Beijing Jiaotong University Institute of Lightwave Technology Key Laboratory of All Optical Network and Advanced Telecommunication Network of Ministry of Education Beijing100044 China

Quad-polarization reconfigurable antenna consists of a three-layered polarizer and an 8 × 8 source antenna is investigated in the Ka-band. By changing the orientation of each layer, the antenna can radiate horizontally polarized, vertically polarized, left-hand and right-hand circularly polarized electromagnetic waves. The 8 × 8 horn array is employed as the source antenna, enhancing the antenna gain and expanding the operating bandwidth. The polarizer and the source antenna are fabricated by 3-D printing technology using photopolymer and aluminum alloy. Excellent operating performance including impedance bandwidth of 51.1%, gain up to 24.8 dBi, dual circular polarization overlap bandwidth of 41.3%, and quad-polarization overlap bandwidth of 24.6% is obtained experimentally by fabricated prototype. The proposed antenna with promising performance is valuable to emerging millimeter-wave applications. © 2002-2011 IEEE.

关键词： Aluminum alloys

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An Accurate Method for Refractive Index Measurement of PDMS Using a DOE Beam Splitter

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IEEE Photonics Technology Letters 2025年第13期37卷 705-708页

作者： Dai, XinGang Niu, Bowen Hu, Yanjun Dai, Qun Ao, Yu Fan, Guofang Beijing Jiaotong University Key Laboratory of All Optical Network and Advanced Telecommunication Network Ministry of Education Institute of Lightwave Technology Beijing100044 China

Polydimethylsiloxane (PDMS) is widely used in optical devices due to its high transparency, biocompatibility, chemical inertness and easy fabrication. Accurate measurement of the PDMS refractive index (RI) is critical for optical applications. In this study, a simple, accurate and reliable method is proposed for measuring the RI of PDMS, which leverages diffractive optical element (DOE) to determine the RI of PDMS by analyzing the uniformity of DOE filled with PDMS. The uniformity of the DOE beam splitter directly depends on the RI difference between the DOE material and filling material. The 3×3, 3×5, 3×7, and 5×5 DOE beam splitters are designed using the Iterative Fourier Transform Algorithm (IFTA) and fabricated through one-step fabrication for RI measurement of PDMS. The RI of PDMS measured using the proposed method shows a mean nPDMS of 1.3826 at 1550 nm with a standard deviation of 0.001, which represents a 12-fold improvement compared to the standard deviation of 0.012 from a mean nPDMS of 1.3934 measured using spectroscopic ellipsometry (SE). This method demonstrates high accuracy and reliability, which can measure the RI of any unknown transparent material compatible with spin-coated or poured on a fabricated DOE beam splitter. © 1989-2012 IEEE.

关键词： Spectroscopic ellipsometry

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High-Precision Mode Decomposition with Low Data Requirements Using Deep Learning

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IEEE Photonics Technology Letters 2025年第14期37卷 793-796页

作者： Sun, Quan Pei, Li Wang, Jianshuai Xu, Lin Gao, Han Hu, Kaihua Zheng, Jingjing Li, Jing Ning, Tigang Beijing Jiaotong University Institute of Lightwave Technology Key Laboratory of All Optical Network & Advanced Telecommunication Network Ministry of Education Beijing100044 China

In this paper, we propose AttenResNet-MD, a method that combines channel attention mechanisms with a residual network architecture, enhancing feature learning efficiency and significantly reducing both the required training dataset size and training time. In simulation tests, AttenResNet-MD achieves high-precision mode decomposition with a modal weight error of less than 0.23% and a modal relative phase error of under 0.39% in the 3-mode case using only a training set of 10,000 beam patterns. Notably, this method achieves advanced mode decomposition accuracy while reducing the training set size by at most 10 times compared to conventional approaches. In experimental tests, the reconstructed beam patterns exhibit a high similarity of over 98% with the real beam patterns captured by a CCD. © 2025 IEEE.

关键词： Deep learning

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Design of Large-Span Beamforming Antenna Based on Beam Superposition and Structure Mapping

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IEEE Antennas and Wireless Propagation Letters 2025年第5期24卷 1268-1272页

作者： Zhang, Yulu Zhang, Xiang Wang, Junhong Beijing Jiaotong University Key Laboratory of All Optical Network and Advanced Telecommunication Network Ministry of Education of China The Institute of Lightwave Technology Beijing100044 China China Academy of Information and Communications Technology Beijing100191 China

In this paper, a novel beamforming patch array antenna with large-span cosecant-distribution pattern is designed. The antenna contains two layers, and eight radiating patch elements together with feeding microstrip branches are designed on the upper surface of the top layer. The bottom layer is a substrate integrated waveguide (SIW) with a series of slots cut in the upper wall, which couple the energy in SIW up to the feeding microstrip branches. Five linear arrays are designed first to generate beams with different radiation angles, and then mapped into a composite array in a weighted way to generate a large-span cosecant-distribution pattern, and minimize the size of antenna. The proposed antenna can provide a uniform radio wave coverage in long-straight confined spaces for stable mobile communications. © 2002-2011 IEEE.

关键词： Slot antennas

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Tunable arbitrary waveform generator based on dispersed Talbot effect in an acousto-optic frequency-shifting loop

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Applied Optics 2025年第13期64卷 3776-3782页

作者： Mu, Hongqian Wang, Muguang Tan, Zhongwei Zhao, Ziying Institute of Lightwave Technology Key Laboratory of All Optical Network and Advanced Telecommunication Network Ministry of Education Beijing Jiaotong University Beijing100044 China

A tunable arbitrary waveform generator based on dispersed Talbot effect in an acousto-optic frequency-shifting loop (FSL) is proposed and demonstrated. A particular dispersion effect near Talbot conditions is revealed, which we first define as dispersed Talbot effect, to the best of our knowledge. The FSL outputs a temporally stretched pulse train with the pulse width controlled by an equivalent dispersion and the repetition period governed by Talbot effects. Under temporal far-field condition, microwave arbitrary waveform with independently tunable pulse width and repetition period can be reconfigurably achieved. The waveform reconfigurability and reversal property, and independent turnabilities of pulse width and repetition period have been demonstrated successfully. © 2025 Optica Publishing Group.

关键词： Acoustooptical effects

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A Compact SIW-fed Antenna with Wide-Angle Coverage and Beam Steering Capability for Enhanced mmW-UAV Communication

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IEEE Transactions on Vehicular Technology 2025年

作者： Fu, Xiaona Zhang, Zhan Guo, Chenguang Wang, Junhong Beijing Jiaotong University Beijing Jiaotong University Key Laboratory of All Optical Network and Advanced Telecommunication Network of Ministry of Education Institute of Lightwave Technology Beijing100044 China

During the evolution from 5G to 6G, integrated spaceair- ground communication has become a hotspot for research. Among them, unmanned aerial vehicle (UAV) communication and millimeter-wave (mmW) technology play important roles. UAV communication requires high-gain, wide-angle coverage, and flexible beam-steering antenna arrays. In this paper, we propose a compact antenna array with wide coverage and beam steering capability for mmW applications. The array is composed of three layers and fed through substrate integrated waveguide (SIW) with three ports. The antenna features a simple, horizontally symmetrical structure. By independently exciting each of the three ports, and combinations where port 2 is excited simultaneously with port 1 or port 3, the antenna generates currents that complement equivalent magnetic currents to produce beams pointing in different directions. The wide beams of the antenna can steer and cover a total range from -60° to 240° across five states. Based on this design, a four-element array is fabricated and tested. Measurement results demonstrate the gains of 10.03, 10.8, and 10.5 dBi within the operational frequency range (23.7-28 GHz), with a radiation efficiency of 87.3%. The proposed antenna features a low-profile and compact structure, achieving a coverage range of approximately 300 degrees. It is highly suitable for UAVs, and small mobile devices when integrated with an integrated chip circuit. Additionally, if matched with a phase shifter, the antenna can achieve two-dimensional scanning capability. © 2025 IEEE.

关键词： Millimeter waves

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A Dual-Polarized Fixed-Frequency Beam-Scanning Leaky-Wave Antenna for 5G Millimeter-Wave Applications

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IEEE Transactions on Antennas and Propagation 2025年

作者： Wei, Bang Li, Zheng Xiong, Zhe Zhao, Yi Chen, Meie Wang, Junhong Beijing Jiaotong University Key Laboratory of All Optical Network and Advanced Telecommunication Network Ministry of Education Institute of Lightwave Technology Beijing100044 China WuHan Maritime Communication Research Institute China

In this paper, a dual-polarized (DP) fixed-frequency beam-scanning leaky-wave antenna (LWA) is presented. Operating from 24.5 to 27.5 GHz, the LWA consists of a vertically polarized (VP) patch array, a horizontally polarized (HP) printed dipole array, and a dual-channel gap waveguide (GW) that provides traveling-wave excitation. The VP patch array, located at the center of the antenna aperture, contains 80 slot-excited patches. The HP dipole array is divided into two subarrays distributed on both sides of the antenna aperture and is excited by slot-coupled microstrip lines. The VP and HP arrays are independent, enabling simultaneous control of both polarization beams. Due to the low profile of the printed dipole, the radiation aperture of the antenna can be fully utilized, providing the ability to expand in two dimensions. To achieve fixed-frequency beam scanning, each antenna unit has a 1-bit amplitude modulation capability, realized by electrically controlling the PIN diode. A dual-channel GW capable of transmitting both TE01 and TE10 modes is designed, and the stacked architecture makes it suitable for a compact DP antenna. Holographic method is employed to realize the beam scanning. Simulated and measured results verify that the proposed antenna can achieve fixed-frequency, wide-angle, and quasi-continuous beam scanning. © 1963-2012 IEEE.

关键词： Scanning antennas

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Design of high group velocity dispersion optical fiber assisted by cascaded neural networks

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Journal of the optical Society of America B: optical Physics 2025年第5期42卷 1139-1145页

作者： Ma, Changzheng Chen, Yuan Li, Mingshu Ning, Tigang Pei, Li Li, Jing Key Laboratory of All Optical Network and Advanced Telecommunication Network Ministry of Education Institute of Lightwave Technology Beijing Jiaotong University Beijing100044 China Aerospace Times Feihong Technology Company Limited Beijing100094 China

The growing demand for high-speed optical communication requires advanced dispersion management to suppress pulse broadening and nonlinear effects. This work proposes a dual-core optical fiber with ultrahigh group velocity dispersion, optimized using cascaded deep neural networks. By leveraging the anti-crossing between the LP01 mode in the central core and the LP02 mode in a side core, controlled mode coupling enables dispersion enhancement. Finite element method simulations show that a dual-core fiber design derived from the standard G.652 fiber achieves an ultrahigh chromatic dispersion of approximately 11,000 ps/(nm · km) at the 1550 nm wavelength window, with tunable bandwidth via core spacing adjustment. This methodology establishes a paradigm for AI-driven photonic device design, offering significant potential for advancing optical communication and ultrafast laser technologies. © 2025 Optica Publishing Group. all rights, including for text and data mining (TDM), Artificial Intelligence (AI) training, and similar technologies, are reserved.

关键词： Deep neural networks

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