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Switchable down-,up-and dual-chirped microwave waveform generation with improved time–bandwidth product based on polarization modulation and phase encoding

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Chinese Physics B 2022年第7期31卷 620-628页

作者： Yuxiao Guo Muguang Wang Hongqian Mu Guofang Fan Institute of Lightwave Technology Key Laboratory of All Optical Network and Advanced Telecommunication NetworkMinistry of EducationBeijing Jiaotong UniversityBeijing 100044China

A switchable down-,up-and dual-chirped microwave waveform generation technique with improved time–bandwidth product(TBWP)is proposed and demonstrated based on a dual-polarization dual-parallel Mach–Zehnder modulator(DPDPMZM)cascaded with a polarization modulator(Pol M).By properly controlling the phase shifts of the radio frequency signals applied to the DP-DPMZM,switchable down-,up-and dual-chirped waveforms with simultaneous frequency and bandwidth doubling can be *** enlarge the TBWP further,splitting parabolic signal and phase-encoding splitting parabolic signal are used to drive the Pol M for the enhancement of bandwidth and time *** results demonstrate the generation of down-,up-and dual-chirped microwave waveform with TBWP of 8,160 and *** proposed method may find applications in future multifunction radar systems due to the high performance and flexibility.

关键词： microwave photonics linearly chirped waveform generation time–bandwidth product

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Measurement of the Coefficient of Thermal Expansion of Carbon Fiber Composites Based on Fabry-Pérot Cavities

Measurement of the Coefficient of Thermal Expansion of Carbo...

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2024 Asia Communications and Photonics Conference, ACP 2024 and International Conference on Information Photonics and optical Communications, IPOC 2024

作者： Xin, Liang Ma, Ning Hui, Tianli Song, Wenjing Wang, Shuchao Bai, Yujun Lv, Haiqing Wang, Wen Yan, Feng Tang, Xiaojun Zhai, Yuanbo Ning, Tigang Beijing Satellite Manufacturing Co. Ltd. Beijing China Key Laboratory of All Optical Network & Advanced Telecommunication Network of EMC Beijing Jiaotong University Beijing China

A method for measuring the thermal expansion coefficient (CTE) of carbon fiber composites based on Fabry-Pérot (FP) cavity is proposed. The CTE of a carbon fiber composite is measured to be 5.18×10^-6/°... 详细信息

ISBN: (纸本)9798350379266

关键词： Fabry-Perot interferometers

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Highly sensitive magnetic field sensor based on a polarimetric fiber laser assisted by a Terfenol-D bar

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Optics Express 2025年第10期33卷 20816-20828页

作者： Xiao, Shiying Feng, Jinglin Wu, Beilei Wang, Xiaoxuan Jiang, Youchao Wang, Zixiao Institute of Lightwave Technology Key Laboratory of All Optical Network & Advanced Telecommunication Network Ministry of Education Beijing Jiaotong University Beijing100044 China School of Electronics and Information Engineering Beijing Jiaotong University Beijing100044 China

We propose a highly sensitive magnetic field sensor based on a polarimetric fiber laser and a Terfenol-D bar. The laser cavity is structured with a high birefringence Erbium-doped fiber (Hi-Bi EDF) and a pair of wavelength-matched fiber Bragg gratings (FBGs). To transduce the magnetic field variations, A Terfenol-D bar is strategically employed, stretching the sensing Hi-Bi EDF upon exposure to the external magnetic field. The induced stress on the Hi-Bi EDF subsequently triggers shifts in the polarimetric mode beat frequency (PMBF), which exhibit a direct and measurable correlation to the variations in the magnetic field intensity. The experimental results show that the proposed sensor features high sensitivity, linear response, and excellent repeatability. It is noteworthy that in three consecutive magnetic field testing experiments, the sensor achieved a magnetic field sensitivity of up to -7.83 MHz/mT in the linear range of 3-12 mT, which surpasses that of comparable sensors by at least one order of magnitude, demonstrating the superiority of this sensor in magnetic field sensing capability. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Magnetic levitation

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Design of a Radial Waveguide Omnidirectional Antenna 10

Design of a Radial Waveguide Omnidirectional Antenna

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10th IEEE International Symposium on Microwave, Antenna, Propagation and emc Technologies for Wireless Communications, MAPE 2024

作者： Tang, Yanfei Li, Zheng Wang, Junhong Institute of Lightwave Technology Beijing Jiaotong University Key Laboratory of All Optical Network and Advanced Telecommunication Network Beijing100044 China

ISBN: (纸本)9798331533922

This paper presents the design of an omnidirectional antenna based on a radial waveguide. To achieve the matching between waveguide and free space, a horn structure is employed. The antenna is coaxially fed, and an inverted cone is employed in the parallel plate for impedance matching. The antenna has strong omnidirectional radiation characteristics and operates in the 3.6 GHz to 4.35 GHz frequency range. © 2024 IEEE.

关键词： Omnidirectional antennas

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Conformal Leaky-Wave Antenna with Scanning Beam Based on Spoof Surface Plasmon Polaritons 10

Conformal Leaky-Wave Antenna with Scanning Beam Based on Spo...

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10th IEEE International Symposium on Microwave, Antenna, Propagation and emc Technologies for Wireless Communications, MAPE 2024

作者： Zhang, Bochao Li, Zheng Wang, Junhong Beijing Jiaotong University Key Laboratory of All Optical Network and Advanced Telecommunication Network Institute of Lightwave Technology Beijing100044 China

ISBN: (纸本)9798331533922

This paper presents a conformal leaky-wave antenna with scanning beam based on spoof surface plasmon polaritons (SSPPs). By utilizing the SSPPs to slow-wave propagation, the rectangular patch units distributed on two staggered layers are used as the radiating structure, and the scanning beam of the conformal leaky-wave antenna is achieved by controlling the on/off state of the PIN diodes on the units. Through simulation analysis, it is found that the antenna operates in the frequency band of 4.2 GHz to 5.5 GHz, and at the frequency of 5.4 GHz, it can achieve beam scanning at multiple angles in the - direction at θ=90°, with a side lobe level lower than -5dB and a realized gain of around 10dBi. The conformal antenna is suitable for operation on curved surfaces such as cylinders. © 2024 IEEE.

关键词： Scanning antennas

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1-Bit Coding Beam Scanning Antenna with Parasitic Patch 10

1-Bit Coding Beam Scanning Antenna with Parasitic Patch

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10th IEEE International Symposium on Microwave, Antenna, Propagation and emc Technologies for Wireless Communications, MAPE 2024

作者： Xu, Yinping Chen, Meie Li, Zheng Wang, Jun Hong Institute of Lightwave Technology Beijing Jiaotong University Key Laboratory of All Optical Network and Advanced Telecommunication Network Beijing100044 China

ISBN: (纸本)9798331533922

In this article, a 1-bit coding reconfigurable beam scanning antenna is proposed. A symmetry of the feeding network is utilized to achieve 1-bit phase conversion. This element is combined with parasitic patch, air gap and uses the method of slot couplings to increase the antenna's bandwidth. The array has a relative bandwidth of 29% from 3.6 to 4.9 GHz. Simulated result indicates that the proposed array can cover the beam scanning range from -49° to 49° without grating lobe. © 2024 IEEE.

关键词： Scanning antennas

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A Suspended Stacked Patch Antenna for Terahertz Applications 11

A Suspended Stacked Patch Antenna for Terahertz Applications

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11th IEEE Asia-Pacific Conference on Antennas and Propagation, APCAP 2023 - Proceedings

作者： Tan, Junyao Li, Yujian Wang, Junhong Beijing Jiaotong University Key Laboratory of All Optical Network and Advanced Telecommunication Network of Moe Beijing China

ISBN: (纸本)9798350326277

In this paper, a wideband suspended stacked patch antenna is investigated. The approach involves the creation of parasitic patches through spin-coating a conductive silver paste onto the underside of the suspension structure, resulting in a terahertz antenna with wideband characteristics. The application of an adjustable suspension bracket method within the structure ensures precise alignment and optimal patch spacing, thereby contributing to superior performance. The proposed antenna achieves remarkable results, including a peak gain of 8.1 dBi and an impressive impedance bandwidth of 25.6%, covering the operating frequency range from 170 GHz to 220 GHz. This configuration offers a straight forward and feasible route to achieving high-performance terahertz antennas, positioning it as a strong contender in the field. © 2023 IEEE.

关键词： Stacked patch terahertz antennas wideband

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Learning Multimode Fiber for Ring Speckle-Based Encryption

Learning Multimode Fiber for Ring Speckle-Based Encryption

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2024 Asia Communications and Photonics Conference, ACP 2024 and International Conference on Information Photonics and optical Communications, IPOC 2024

作者： Gao, Han Pei, Li Wang, Jianshuai Hu, Zhouyi Hu, Kaihua School of Electronics and Information Engineering Beijing Jiaotong University Key Laboratory of All Optical Network and Advanced Telecommunication Network of Ministry of Education Beijing China

An optical cryptographic system based on multimode fiber with ring speckles is proposed. This system leverages the speed of light for encryption and deep learning for decryption. It is expected to enhance the security... 详细信息

ISBN: (纸本)9798350379266

关键词： Multimode fibers

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Spectral Self-Imaging Based on all-optical Cross-Phase Modulation with Multilevel Pump

Spectral Self-Imaging Based on All-Optical Cross-Phase Modul...

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2024 Asia Communications and Photonics Conference, ACP 2024 and International Conference on Information Photonics and optical Communications, IPOC 2024

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

Spectral self-imaging is achieved based on all-optical cross-phase modulation with multilevel pump, which is generated using a cost-effective frequency-to-time mapping module. This method can realize energy-preserving... 详细信息

ISBN: (纸本)9798350379266

关键词： Mapping

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Coexistence of noise-like pulse and dark pulse in an Er/Yb co-doped fiber laser

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Chinese Optics Letters 2024年第5期22卷 68-74页

作者：李婧王春灿王鹏 Key Laboratory of All Optical Network and Advanced Telecommunication Network Ministry of EducationInstitute of Lightwave TechnologyBeijing Jiaotong UniversityBeijing 100044China

The coexistence of a noise-like pulse(NLP)and a dark pulse was experimentally demonstrated in a net-anomalous dispersion Er/Yb co-doped fiber(EYDF)laser,for the first time,to our *** cavity was mode-locked by nonlinear polarization rotation(NPR)***,a Sagnac loop with a section of polarization-maintaining fiber(PMF)was used as a comb filter to enable multiwavelength pulse *** the PMF length was 0.3 m,an asymmetric two-peak spectrum with central wavelengths of 1565.3 and 1594.2 nm was obtained by adjusting polarization controllers(PCs).It is a composite state of NLP and dark pulse due to the cross-phase modulation between the two different wavelength components along orthogonal polarization *** two pulses are synchronized with a repetition rate of 7.53 *** adjusting the PC in the Sagnac loop,the spectral ranges of NLPs and dark pulses can be tuned from 1560 to 1577.8 nm and from 1581.8 to 1605.4 nm,*** addition,the pulse characteristics were investigated by incorporating the PMF with different lengths,where the coexistence patterns can be generated when the PMF lengths were 0.2 and 0.3 m.A longer PMF can lead to a narrowband comb filtering,which causes a larger loss and is not favorable for stable operation of the coexistence *** fiber laser demonstrates an interesting operation regime and has significant potential for numerous practical applications.

关键词： coexistence state mode-locked fiber laser Sagnac loop tunable wavelength

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