检索结果-内蒙古大学图书馆

Numerical simulation of the heavily Ge-doped polarization-maintaining fiber with normal dispersion

Optoelectronics Letters 2022年第1期18卷 35-42页

作者： LI Hongwei WANG Chuncan AN Haitao Key Laboratory of All Optical Network and Advanced Telecommunication Network Ministry of EducationInstitute of Lightwave TechnologyBeijing Jiaotong UniversityBeijing 100044China

The heavily germanium(Ge)-doped silica fiber assisted by two air holes in the cladding exhibits high nonlinearity and birefringence,low loss and normal group velocity dispersion(GVD)for two fundamental modes(FMs).When the 1920 nm and 0.1 ps pump pulse with 100 kW peak power is coupled into the 0.5-m-long fiber and polarized along one of two principle axes,the generated spectra can cover the wavelength range around 1000—2500 nm at-20 ***,the output pulse has an excellent coherence in the whole wavelength range.

关键词： fiber polarization pump

来源：评论

学校读者我要写书评

暂无评论

A TE-Mode Groove-Gap-Waveguide-Based Wideband Fixed-Frequency Beam-Scanning Leaky-Wave Antenna for Millimeter-Wave Applications

引用

IEEE Transactions on Antennas and Propagation 2022年第6期70卷 4171-4180页

作者： Wang, Shanzhe Li, Zheng 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

A wideband fixed-frequency beam-scanning leaky-wave antenna (LWA) operating at the millimeter-waveband is presented in this article. A groove gap waveguide (GGW) supporting base is introduced as a transmission structure of the antenna with a TE01-mode excitation, and two rows of longitudinal slots etched on top of the superstrate act as the radiating structures. Two rows of PIN diodes are soldered below the longitudinal slots, so that the long slots can be cut into a group of short slots. By controlling the PIN diodes, the working states of the slots can be switched between 'ON' and 'OFF.' Then, by selecting proper activation states, the fixed-frequency beam scanning can be obtained. In addition, the developed antenna is verified in practical fabrication and experiment. The experimental results have good agreements with that in simulations. The measured peak gain reaches at 16.8 dBi, and the beam-scanning range more than 70° from 23 to 29 GHz is realized. © 1963-2012 IEEE.

关键词： Millimeter waves

来源：评论

学校读者我要写书评

暂无评论

Simultaneous measurement of temperature and strain by a single fiber Bragg grating based on bending losses

引用

Optoelectronics Letters 2024年

作者： Zhong Guangxin Liu Shengchun Pei Li Zhang Bingbing Zhai Yuanbo Ning Tigang Key Laboratory of All Optical Network & Advanced Telecommunication Network of EMC， Beijing Jiaotong University School of Civil Engineering， Beijing Jiaotong University

Fiber Bragg grating （FBG） sensors are extensively used in various sensing applications due to their high sensitivity. However， they are inherently sensitive to both strain and temperature， a cross-sensitivity problem， making it impossible to simultaneously monitor these two parameters using the Bragg wavelength shifts of a single uniform FBG. In this study， we bend the FBG pigtail to cause bending loss. The peak power of the FBG is used as the second characterization quantity. Our experimental results show that the Bragg wavelength sensitivities to strain (Kε) and temperature (KT) are 0.17 pm/με and 16.5 pm/°C， respectively. Additionally， the peak power sensitivities to strain (Pε) and temperature (PT) are -0.00202 dBm/με and -0.06 dBm/°C， respectively. The linear correlation coefficients for these measurements are all above 0.996. In this way， it is possible to simultaneously measure both strain and temperature using a single uniform FBG.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Design of ring-sector-assisted PANDA ring-core few mode fiber

引用

Optoelectronics Letters 2022年第6期18卷 366-371页

作者： DU Zhiyong WANG Chuncan LI Peixin PEI Li ZHENG Jingjing NING Tigang Key Laboratory of All Optical Network and Advanced Telecommunication Network Ministry of EducationInstitute of Lightwave TechnologyBeijing Jiaotong UniversityBeijing 100044.China

For the PANDA ring-core polarization-maintaining few-mode fiber(RC-PM-FMF)with the given supported eigenmodes,the minimum effective refractive index difference min(Δneff)between the adjacent eigenmodes decreases with the RC ***,we propose a PANDA RC-PM-FMF assisted by a ring-sector(RS)structure,which can be used to mainly increase theΔneff values between the adjacent even and odd eigenmodes with the same *** RS-RC-PM-FMF with an appropriate choice of the parameters can support 10 linearly polarized(LP)eigenmodes,which have min(Δneff)values higher than 1.9×10^(-4) for the adjacent eigenmodes over the whole C+L ***,the fiber is characterized by the low group velocity dispersion(GVD)(-40—20 ps·nm^(-1)·km^(-1))and effective mode areas(63—104μm^(2)),while the total losses are within the range of 0.19—0.23 d B/km over the whole band.

关键词： mode PANDA dispersion

来源：评论

学校读者我要写书评

暂无评论

1128W Continuous-Wave single-Mode Green laser output by frequency doubling of a linear-polarization narrow-linewidth 1μm fiber laser

1128W Continuous-Wave single-Mode Green laser output by freq...

引用

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

作者： Huang, Guoxi Li, Wenjia Zhang, Fan Ning, Tigang Pei, Li Key Laboratory of All Optical Network and Advanced Telecommunication Network. Beijing Jiaotong University Beijing China Shenzhen Gongda Laser Co. Ltd. Shenzhen China

ISBN: (纸本)9798350379266

Based on phase-modulated single-frequency seed technology, we have achieved 1925W high-power near-infrared single-mode laser output from a polarization-maintaining narrow-linewidth Yb-doped fiber laser. Furthermore, by employing a single-pass frequency-doubling method, we have obtained 1128W of continuous single-mode green light output, with a frequency-doubling efficiency of 58.6% and an output beam quality factor M^2 of 1.05. This represents the highest frequency-doubling efficiency reported to date for high-power single-mode continuous-wave green light output achieved through a single-pass frequency-doubling scheme. © 2024 IEEE.

关键词： Fiber lasers

来源：评论

学校读者我要写书评

暂无评论

optical frequency comb with tunable free spectral range based on two Mach-Zehnder modulators cascaded with linearly chirped fiber Bragg grating and phase modulator

引用

Optoelectronics Letters 2022年第7期18卷 385-389页

作者： GUAN Xiangshuai MU Hongqian WANG Muguang Key Laboratory of All Optical Network and Advanced Telecommunication Network Ministry of EducationInstitute of Lightwave TechnologyBeijing Jiaotong UniversityBeijing 10044China

An approach for generating optical frequency comb(OFC)with tunable free spectral range(FSR)is *** Mach-Zehnder modulators(MZMs)driven by phase-shifted sinusoidal signals are cascaded to generate OFC with plentiful comb lines and the FSR controlled by the drive ***,a linearly chirped fiber Bragg grating(LCFBG)and a phase modulator(PM)are used to increase the comb FSR by a particular integer ***,by simultaneously controlling the drive frequency of MZMs,the dispersion amount of the LCFBG and the drive signal of the PM,an OFC with desired FSR can be achieved.

关键词： modulator tunable fiber

来源：评论

学校读者我要写书评

暂无评论

Design and characteristics of square-assisted ring-core fiber for mode space degenerate modulating 13

Design and characteristics of square-assisted ring-core fibe...

引用

13th International Conference on Information Optics and Photonics, CIOP 2022

作者： Song, Yujing Zheng, Jingjing Pei, Li Huang, Jing Ning, Tigang Li, Jing Wang, Jianshuai Bai, Bing Key Laboratory of All Optical Network and Advanced Telecommunication Network of EMC Institute of Lightwave Technology Beijing Jiaotong University Beijing100044 China

ISBN: (纸本)9781510660632

A novel square-assisted ring-core fiber characterized by a square region of low refractive index in the core was proposed. This fiber structure allows for spatial mode modulation. When the subscript m of the LPmn modes supported by the fiber is an even number, the spatial modes of the LPmn modes are degenerately separated. This fiber supports 15 modes over the entire C-band. The effective refractive index difference (Δneff) between spatial modes at 1550nm is greater than 1.18×10-4. At the same time, the Δneff between all adjacent modes is in the range of (1.13~13.52)×10-4. The polarization separation level of each mode is below 7.12×10-6, which is two orders of magnitude lower than the level of degenerate separation of spatial modes. Numerical simulations show that the dispersion values range from -16 ps/nm/km to 15 ps/nm/km for 15 modes over the entire C-band. This fiber has a good tolerance for process error, the optical fiber processing requirements can be met by using the existing optical fiber preparation technology. © 2022 SPIE.

关键词： optical fibers

来源：评论

学校读者我要写书评

暂无评论

Study on the phenomenon of double dominant modes in vortex fiber with ring-core structure

Study on the phenomenon of double dominant modes in vortex f...

引用

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

作者： Zhao, Yuzhen Jiang, Youchao Su, Yongfu Qin, Mengjuan Xiao, Shiying Su, Yafan Key Laboratory of All Optical Network & Advanced Telecommunication Network Ministry of Education Beijing Jiaotong University Beijing100044 China Institute of Lightwave Technology Beijing Jiaotong University Beijing100044 China

ISBN: (数字)9798350379266

ISBN: (纸本)9798350379266

The vortex fiber is a fiber that can generate and transmit orbital angular momentum (OAM) modes. The vector modes in the same mode group in the vortex fiber with ring-core structure are no longer degenerate. We find that when the refractive index of core much lower than the ring, the dominant mode will appear in both the ring (HE11)and the core (HE12). After making this kind of fiber into a Bragg grating, it is found that the dominant modes of the outer and inner sides will both produce strong reflection peaks. In addition, in the process of grating measurement, the reflection peak intensity of the inner dominant mode can be reduced by means of dislocation until it disappears. The phenomenon found in this paper has important application value in the field of mode filter and mode separation. © 2024 IEEE.

关键词： Fiber Bragg gratings

来源：评论

学校读者我要写书评

暂无评论

Influence of Multiple-beam Interference on Diffractive Waveguide Imaging 3

Influence of Multiple-beam Interference on Diffractive Waveg...

引用

3rd International Conference on Laser, Optics, and Optoelectronic Technology, LOPET 2023

作者： Ji, Wenjie Tan, Zhongwei Key Lab of All Optical Network & Advanced Telecommunication Network Ministry of Education Institute of Light Wave Technology School of Electronic and Information Engineering Beijing Jiaotong University Beijing100044 China

ISBN: (纸本)9781510667624

This paper applies Fresnel diffraction theory to analyze the phenomenon of multiple-beam interference in thin waveguides, and subsequently carries out simulation experiments. And further investigates the correlation between the angular deviation triggered by interference and the thickness of the waveguide. To be specific, the paper delves into the detailed analysis of this correlation, thus highlighting the significance of this research. © 2023 SPIE.

关键词： Augmented reality

来源：评论

学校读者我要写书评

暂无评论

Strain and Temperature Discrimination Based on a Mach-Zehnder Interferometer With Cascaded Single Mode Fibers

引用

Photonic Sensors 2023年第1期13卷 40-48页

作者： Shiying XIAO Beilei WU Chunran SUN Zixiao WANG Youchao JIANG Key Laboratory of All Optical Network and Advanced Telecommunication Network of EMC Institute of Lightwave TechnologyBeijing Jiaotong UniversityBeijing 100044China System Integration Department China North Industries Corp.Beijing 100053China

An in-fiber Mach-Zehnder interferometer is proposed for the discrimination of strain and *** sensor is based on two cascaded standard single mode fibers using three peanut tapers fabricated by simple *** cascaded structure excites more frequency components,which induce four sets of interference dips in the transmission *** set of the spectrum dips have different sensitivities to temperature and strain from those of the other *** sensor can discriminate strain and temperature by monitoring the wavelength shifts of two spectrum *** experiments are taken both for strain and temperature increasing and decreasing *** results show that Dip 1 has an average strain sensitivity of-0.911 pm/με and an average temperature sensitivity of 49.98pm/℃.The strain sensitivity for Dip 2 is negligible and its average temperature sensitivity is 60.52pm/℃.The strain and temperature resolutions are±3.82με and±0.33℃.

关键词： Mach-Zehnder interferometer peanut taper simultaneous measurement single mode fiber strain sensor temperature sensor

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：