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Conference on Lasers and Electro-Optics (CLEO)

作者： Yikai Su Yu He Ruihuan Zhang Yong Zhang Department of Electronic Engineering State Key Lab of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai China

We review recent results on integrated silicon photonic chips for (de)multiplexing and switching, which operate in wavelength, polarization, and mode dimensions.

关键词： Multiplexing Switches Lasers and electrooptics Silicon photonics Laser modes System-on-chip Electrooptical waveguides

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Demonstration of a Rectangular Core Few-mode Fiber with Ultra-low Differential Group Delay

Demonstration of a Rectangular Core Few-mode Fiber with Ultr...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Ruihuan Zhang Gang Chen Yuanhang Zhang Liangming Xiong Haoshuo Chen Nicolas K. Fontaine Yikai Su Department of Electronic Engineering State Key Lab of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai China Nokia Bell Labs Holmdel NJ USA State Key Laboratory of Optical Fiber and Cable Manufacture Technology Yangtze Optical Fiber and Cable Joint Stock Limited Company (YOFC) Wuhan China

We design and experimentally demonatrate a rectangular core few-mode fiber that can support the transmission of TE 00 /TM 00 , TE 1. /TM 1. and TE 20 /TM 20 modes with ultra-low differential group delays.

ISBN: (数字)9781957171050

ISBN: (纸本)9781665466660

关键词： optical fiber polarization Multiplexing Laser modes Delays Electo-optic effects Fiber lasers

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Design and Fabrication Optimization of Low-Crosstalk Silicon Arrayed Waveguide Gratings with 32 Channels and 1.0-Ghz Spacing

SSRN

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SSRN 2022年

作者： Xie, Changjian Zou, Xihua Zou, Fang Zhang, Yong Yan, Lianshan Pan, Wei School of Information Science & Technology Southwest Jiaotong University Sichuan Chengdu610031 China State Key Lab of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai200240 China

To satisfy the stringent requirements of large-capacity optical {1. systems, the high-performance silicon arrayed waveguide gratings (AWG) with 32 wavelength channels and 1.0 GHz spacing are designed and fabricated. First of all, three types of arrayed waveguides are designed for seeking better performances, including rectangular-type, arc-type, and S-type ones. During fabrication, the taper connector is then introduced and the waveguide sidewall is further smoothed. Among the samples fabricated using E-beam lithography (EBL), the one with rectangular-type arrayed waveguides is characterized with better performance, showing a crosstalk of -1. dB and an insertion loss of 7.5 dB. Then, the target design with rectangle arrayed waveguides is further optimized and fabricated using 1.0-nm lithography platform for massive production. Outstanding results are achieved with an insertion loss of 4.5 dB, a channel uniformity of 0.95 dB, and a crosstalk as low as -20.4 dB, respectively. As far as we know, the AWGs might be the first compact silicon one fabricated by commercial lithography platform, characterized by comprehensive specifications (i.e., lowest crosstalk, highest channel uniformity, lowest insertion loss) for massive 1.0-GHz wavelength multiplexing/de-multiplexing. © 2022, The Authors. All rights reserved.

关键词： Crosstalk

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Ultra-compact beam steering nanolasers

arXiv

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arXiv 2024年

作者： Chen, Xinghong Gu, Mingxuan Tang, Jiankai Sang, Yungang Xiang, Bingrui Zhang, Kong Zhang, Guanjie Wang, Xingyuan Guo, Xuhan Zhou, Linjie Wu, Wengang Mao, Yifei School of Sensing Science and Engineering School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University Shanghai200240 China SJTU-Pinghu Institute of Intelligent Optoelectronics Pinghu314200 China Institute of Microelectronics Chinese Academy of Sciences Beijing100029 China College of Mathematics and Physics Beijing University of Chemical Technology Beijing100029 China State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai200240 China State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Key Lab of Navigation and Location Services Shanghai Institute for Advanced Communication and Data Science Department of Electronic Engineering Shanghai Jiao Tong University Shanghai200240 China National Key Laboratory of Science and Technology on Micro/Nano Fabrication School of Integrated Circuits Peking University Beijing100871 China Beijing Advanced Innovation Center for Integrated Circuits Beijing100871 China Frontiers Science Center for Nano-optoelectronics Peking University Beijing100871 China

The miniaturization and integration of beam steering devices have consistently been the focus of the field. Conventional methods alter the eigenmode of the optical cavity by regulating the refractive index. Due to the weak nonlinear effect of the optical system, the device must be sufficiently large to achieve sufficient light modulation. The effective method for miniaturizing beam steering devices currently in use is based on metasurfaces. However, this type of device necessitates the input of a laser source, which precludes the simultaneous generation and control of light in a single device. Here we propose a miniaturized beam steering device that employs mode selection between different bound states in the continuum (BIC) states through phase change material. The device is capable of simultaneously achieving both light generation and beam steering (33°) in a single device with a size of only 25 μm and with a low threshold of 8.9 kW cm-2. Furthermore, it is possible to achieve a significant degree of dynamic wavelength tunability, with a range extending up to 296 nm. This method achieves high-efficient regulation of light properties by dynamically controlling the system’s topological charge, circumventing the problem of weak nonlinearity in traditional methods. Furthermore, the integration of phase change materials with nanolasers enables the direct alteration of lasing properties, which provides a novel idea for dynamic light control. The device process scheme based on phase change materials is straightforward, direct, and highly compatible, which will be advantageous for its intended application. Copyright © 2024, The Authors. All rights reserved.

关键词： Phase change materials

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Whispering-gallery-mode barcode-based broadband sub-femtometer-resolution spectroscopy with an electro-optic frequency comb

arXiv

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arXiv 2022年

作者： Xu, Bingxin Wan, Yangyang Fan, Xinyu He, Zuyuan State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai200240 China Max-Planck Institute of Quantum Optics Hans-Kopfermann-Straße 1 Garching85748 Germany

Spectroscopy is the basic tool for studying molecular physics and realizing bio-chemical sensing. However, it is challenging to realize sub-femtometer resolution spectroscopy over broad bandwidth. In this paper, broadband and high-resolution spectroscopy with calibrated optical frequency is demonstrated by bridging the fields of speckle patterns and electro-optic frequency comb (EOFC). A novel wavemeter based on whispering-gallery-mode (WGM) speckles (or WGM barcodes) is proposed to link the frequency of a tunable continuous-wave (CW) laser to an optical reference provided by an ultra-stable laser. The ultra-fine comb lines generated from the CW laser sample the spectrum with sub-femtometer resolution. Measurement bandwidth is far extended by performing sequential acquisitions, since the centre optical frequency of EOFC is absolutely determined by WGM speckle-based wavemter. This approach fully utilizes the advantages of two fields to realize 0.8-fm resolution with a fiber laser and 80-nm bandwidth with an external cavity diode laser. The spectroscopic measurements of an ultrahigh-Q cavity and the HCN gas absorption is demonstrated, which shows the potentials of this compact system with high resolution and broad bandwidth for more applications. Copyright © 2022, The Authors. All rights reserved.

关键词： Natural frequencies

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Record high-order mode-division-multiplexed transmission on chip using gradient-duty-cycle subwavelength gratings

Record high-order mode-division-multiplexed transmission on ...

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optical Fiber {1. (OFC) Conference

作者： Yu He Shaohua An Xingfeng Li Yetian Huang Yong Zhang Haoshuo Chen Yikai Su State Key Lab of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai China Key Laboratory of Specialty Fiber Optics and Optical Access Networks Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication Shanghai University Shanghai China Nokia Bell Labs Holmdel New Jersey USA

We demonstrate 1.-channel mode (de)multiplexers on a silicon chip using gradientduty-cycle subwavelength gratings. A 1.51.Tbit/s/polarization/wavelength capacity is achieved at 1.50 nm with 7 neighboring 50-GHz spaced... 详细信息

ISBN: (纸本)9781943580866

关键词： Spectral efficiency Wavelength division multiplexing Silicon optical fiber {1. Gratings

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Impact of Aperture Size on Beam Evolution of optical Phased Arrays

Impact of Aperture Size on Beam Evolution of Optical Phased ...

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optical Fiber {1. (OFC) Conference

作者： Weihan Xu Chuxin Liu Yuyao Guo Xinhang Li Liangjun Lu Jianping Chen Linjie Zhou State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Key Lab of Navigation and Location Services Shanghai Institute for Advanced Communication and Data Science Shanghai Jiao Tong University Shanghai China SJTU-Pinghu Institute of Intelligent Optoelectronics Pinghu China

We investigate the beam evolution of optical phased arrays. The model is validated with a 1.cm-long grating antenna and applied to both large-scale arrays and long antennas for its impact.

ISBN: (纸本)9781943580866

We investigate the beam evolution of optical phased arrays. The model is validated with a 1.cm-long grating antenna and applied to both large-scale arrays and long antennas for its impact.

关键词： Phased arrays optical fibers Integrated optics optical imaging Laser modes optical fiber {1. Laser beams

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$8\times 8$ Microring optical Switch on a Dual-layer Si3N4-on-SOI Platform

$8\times 8$ Microring Optical Switch on a Dual-layer Si3N4-o...

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Asia communications and Photonics Conference and Exhibition (ACP)

作者： Xin Li Wei Gao Liangjun Lu Jianping Chen Linjie Zhou State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Key Lab of Navigation and Location Services Shanghai Institute for Advanced Communication and Data Science Shanghai Jiao Tong University Shanghai China SJTU-Pinghu Institute of Intelligent Optoelectronics Pinghu China

We demonstrate an $8\times 8$ microring switch based on a dual-layer Si3N4-on-SOI platform. Experimental results show the chip has a fiber-to- fiber insertion loss < 9.23 dB, crosstalk < -22.5 dB and optical b... 详细信息

ISBN: (纸本)9781665410953

关键词： optical fiber losses optical switches optical device fabrication Crosstalk Insertion loss Bandwidth optical crosstalk

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On-chip mode-division multiplexing with modal crosstalk mitigation

On-chip mode-division multiplexing with modal crosstalk miti...

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optical Fiber {1. Conference, OFC 2020

作者： Huang, Yetian Zhang, Ruihuan Chen, Haoshuo Huang, Hanzi Zhu, Qingming He, Yu Yuan, Yuan Song, Yingxiong Fontaine, Nicolas K. Ryf, Roland Zhang, Yong Su, Yikai Wang, Min Key Laboratory of Specialty Fiber Optics and Optical Access Networks Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication Shanghai Institute for Advanced Communication and Data Science Shanghai University Shanghai200444 China State Key Lab of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai200240 China Nokia Bell Labs 791 Holmdel Rd. HolmdelNJ07733 United States

We experimentally demonstrate modal crosstalk mitigation over an on-chip mode-division multiplexing link employing low-coherence matched detection. 20-Gbaud QPSK and 8-PSK mode-multiplexed signals are successfully tra... 详细信息

ISBN: (纸本)9781943580712

关键词： Crosstalk

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Degrees of Freedom of Holographic MIMO in Multi-user Near-field Channels

arXiv

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arXiv 2024年

作者： Chen, Houfeng Yue, Shaohua Di Renzo, Marco Zhang, Hongliang The State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Peking University Beijing100871 China Université Paris-Saclay CNRS CentraleSupélec Lab-oratoire des Signaux et Systèmes 3 Rue Joliot-Curie Gif-sur-Yvette91192 France King’s College London Centre for Telecommunications Research Department of Engineering LondonWC2R 2LS United Kingdom

Holographic multiple-input multiple-output (HMIMO) is an emerging technology for 6G communications, in which numerous antenna units are integrated in a limited space. As the HMIMO array aperture expands, the near-field region of the array is dramatically enlarged, resulting in more users being located in the near-field region. This creates new opportunities for wireless communications. In this context, the evaluation of the spatial degrees of freedom (DoF) of HMIMO multi-user systems in near-field channels is an open problem, as the analytical methods utilized for evaluating the DoF in far-field channels cannot be directly applied. In this paper, we propose a novel method to calculate the DoF of HMIMO in multi-user near-field channels. We first derive the DoF for a single user in the near field, and then extend the analysis to multi-user scenarios. In this latter scenario, we focus on the impact of spatial blocking between HMIMO users. The derived analytical framework reveals that the DoF of HMIMO in multi-user near-field channels is not in general given by the sum of the DoF of the HMIMO single-user setting because of spatial blocking. Simulation results demonstrate the effectiveness of the proposed method. In the considered case study, the number of DoF reduces by 21.2% on average due to spatial blocking. Copyright © 2024, The Authors. All rights reserved.

关键词： Degrees of freedom (mechanics)

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