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Integrated sensing and communication in an optical fibre

Light(Science & Applications) 2023年第5期12卷 729-742页

作者： Haijun He Lin Jiang Yan Pan Anlin Yi Xihua Zou Wei Pan Alan E.Willner Xinyu Fan Zuyuan He Lianshan Yan Center for Information Photonics&Communications School of Information Science and TechnologySouthwest Jiaotong University611756 ChengduSichuanChina Peng Cheng Laboratory 518052 ShenzhenChina Optical Fiber Communications Laboratory University of Southern CaliforniaLos AngelesCA 90089USA State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University200240 ShanghaiChina

The integration of high-speed optical communication and distributed sensing could bring intelligent functionalities to ubiquitous optical fibre networks,such as urban structure imaging,ocean seismic detection,and safety monitoring of underground embedded *** work demonstrates a scheme of integrated sensing and communication in an optical fibre(ISAC-OF)using the same wavelength channel for simultaneous data transmission and distributed vibration *** scheme not only extends the intelligent functionality for optical fibre communication system,but also improves its transmission performance.A periodic linear frequency modulation(LFM)light is generated to act as the optical carrier and sensing probe in PAM4 signal transmission and phase-sensitive optical time-domain reflectometry(Φ-OTDR),*** a 24.5 km fibre transmission,the forward PAM4 signal and the carriercorrespondence Rayleigh backscattering signal are detected and *** results show that the integrated solution achieves better transmission performance(~1.3 dB improvement)and a larger launching power(7 dB enhancement)at a 56 Gbit/s bit rate compared to a conventional PAM4 signal ***,a 4m spatial resolution,4.32-nε/√Hz strain resolution,and over 21 kHz frequency response for the vibration sensing are *** proposed solution offers a new path to further explore the potential of existing or future fibre-optic networks by the convergence of data transmission and status *** addition,such a scheme of using shared spectrum in communication and distributed optical fibre sensing may be used to measure non-linear parameters in coherent optical communications,offering possible benefits for data transmission.

关键词： communication optical fibre

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Multilevel Polar-Coded PAM-8 with MSB Shaping over Turbulent FSO Communication Link

Multilevel Polar-Coded PAM-8 with MSB Shaping over Turbulent...

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2023 Asia communications and Photonics Conference/2023 International Photonics and Optoelectronics Meetings, ACP/POEM 2023

作者： Yang, Weiying Liu, Xiaoyu Liu, Zhiyang Xiao, Shilin Shanghai Jiao Tong University The State Key Laboratory of Advanced Optical Communication System and Networks Shanghai200240 China

ISBN: (纸本)9798350312614

Thanks to the flexibility and adaptability of polar codes, a Free-space optical (FSO) communication scheme combining it with probabilistic shaping (PS) and pulse amplitude modulation (PAM) is proposed to achieve capacity improvement in atmospheric turbulence (AT) channels. The proposed scheme generates a non-uniform probability distribution PAM-8 transmission symbol by a multilevel polar-coded modulation (MLPC) method equipped with the most significant bit (MSB) level shaping precoder. Under the selected turbulence conditions, it provides up to 1.09dB theoretical shaping gain of capacity at the specified information rate (AIR) of 1.859 bit/channel use and 0.82dB performance gain in block error rate. © 2023 IEEE.

关键词： FSO Multilevel Coding PAM8 Probabilistic Shaping Turbulence Channel

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Comparison of Nonlinear Equalizers in C-Band DML-DD Link for 1024-QAM Digital-Analog Radio-over-Fiber Transmission 49

Comparison of Nonlinear Equalizers in C-Band DML-DD Link for...

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49th European Conference on optical communications, ECOC 2023

作者： Zhang, Yikun Zhu, Yixiao Yan, Zijun Hu, Yimin Xu, Yicheng Zhuge, Qunbi Hu, Weisheng State Key Laboratory of Advanced Optical Communication System and Networks Shanghai Jiao Tong University Shanghai200240 China

ISBN: (纸本)9781839539954

We experimentally demonstrate 12-GHz 1024-QAM OFDM signal transmission using digitalanalog radio-over-fiber in C-band DML-DD link under chirp-dispersion interaction. Volterra-based nonlinear and piecewise linear equalizers obtain 4.5-dB and 3.5-dB SNR improvement in strong nonlinear region, while low-complexity composite second-order cancellation is accurate in moderate nonlinear region. © The Institution of Engineering & Technology 2023.

关键词： Radio transmission

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Silicon photonic integrated interrogator for fiber-optic distributed acoustic sensing

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Photonics Research 2024年第3期12卷 465-473页

作者： ZHICHENG JIN JIAGENG CHEN YANMING CHANG QINGWEN LIU ZUYUAN HE State Key Laboratory of Advanced Optical Communication System and Networks Department of Electronic EngineeringShanghai Jiao Tong UniversityShanghai 200240China

Distributed acoustic sensing(DAS)technology has been a promising tool in various ***,the large size and relatively high cost of DAS equipment composed of discrete devices restrict its further popularization to some degree,and the photonic integration technology offers a potential *** this paper,we demonstrate an integrated interrogator for DAS on the silicon-on-insulator(SOI)*** design of the chip revolves around a Mach–Zehnder modulator(MZM)transmitter and a dual-quadrature and dualpolarization coherent *** integrated interrogator supports multiple DAS schemes,including the time-gated digital optical frequency domain reflectometry(TGD-OFDR),which is adopted for system performance evaluation.59■strain resolution in 12.1km sensing fiber with 1.14 m spatial resolution(SR)is ***,along 49.0 km sensing fiber,81■strain resolution with 3.78 m SR is *** results show that the integrated interrogator has comparable performance to the discrete DAS *** the best of our knowledge,this is the first dedicated on-chip DAS interrogator,which validates the effectiveness of the blend of photonics integration and DAS technology.

关键词： fiber polarization modulator

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Preparation conditions investigation on high-quality lithium niobate thin films on SiO2substrates

Preparation conditions investigation on high-quality lithium...

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2023 advanced Fiber Laser Conference, AFL 2023

作者： Chen, Yilai Hao, Ya-Nan Song, Ruixiang Li, Yanping State Key Laboratory of Information Photonics and Optical Communications School of Science Beijing University of Posts and Telecommunications Beijing100876 China State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Peking University Beijing100871 China

ISBN: (纸本)9781510677661

Lithium niobate (LiNbO3, LN) is a dielectric material with excellent ferroelectric, electro-optic, nonlinear-optic, and acoustic-optic properties. Although the thin film LN-on-insulator (LNOI) wafers are widely used in integrated photonics, it is very difficult to prepare high-quality LN thin film for thin film LN-on-insulator (LNOI) wafers with integrated functions and good performance. Currently, the most common preparation method for LNOI is crystal-ion-slicing (CIS). In addition, several techniques, including chemical vapor deposition, RF sputtering, pulsed laser deposition, sol-gel, and molecular beam epitaxy, have been developed to produce high-quality films. However, these methods cannot produce highly crystalline materials. This situation severely limits the choice of substrate in LNOI preparation. The main purpose of this study is to explore the influence of different sputtering power and annealing conditions on the optical properties of LN thin films prepared by RF sputtering. The LN thin films were prepared by RF sputtering on SiO2 substrates under different powers for 1 h, and the fastest sputtering power was selected. Using this power, thicker LN thin films were prepared within 2 h and annealed rapidly at 500, 600, and 700 °C. By analyzing the properties of crystal orientation, refractive index, extinction coefficient, film thickness, and surface morphology, we found the obvious changes in these properties of LN thin films under different sputtering and annealing conditions, and the optimal sputtering conditions to fabricate high-quality LN thin film has been developed. Among all the prepared samples, the sample annealed at 700 °C for 20 min had the best quality. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

关键词： Thin films

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Integrated Distributed Acoustic Sensing Interrogator Based on Silicon Photonics 3

Integrated Distributed Acoustic Sensing Interrogator Based o...

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3rd EAGE Workshop on Fiber Optic Sensing for Energy Applications

作者： Chen, J. Chang, Y. Liu, Q. He, Z. State Key Laboratory of Advanced Optical Communication System and Networks Department of Electronic Engineering Shanghai Jiao Tong University China

ISBN: (纸本)9789462824836

Distributed acoustic sensing (DAS) is an important branch of fiber optic sensing, but there have been problems of size, weight, and cost that hinder its practical application. In order to solve these problems, photonic integration technology is an effective means. In this work, we have demonstrated a highly integrated DAS interrogator based on the silicon-on-insulator (SOI) platform. The DAS interrogator contains two parts, a transmitter based on a Mach-Zehnder modulator and a coherent receiver. In the demo experiment, with time-gated digital optical frequency domain reflectometry (TGD-OFDR) chosen as the testing DAS scheme, the strain resolution is about 77.0 pΕ/√Hz with the spatial resolution of 0.819 m along the total 12.2 km sensing fiber, which is comparable to the discrete system. To the best of our knowledge, this is the first integrated DAS interrogator, and achieves a high level of integration and excellent performance. The implementation of the integrated DAS system also demonstrates the integration possibilities of fiber optic sensing systems of other architectures, and that these integrated systems may achieve good performance. The integrated DAS heralds the possibility of making the application scenarios of DAS expand. With the development of silicon photonics technology, devices that are not integrated at this stage, such as lasers, can also be integrated, truly realizing the full integration of the system. © 2023 3rd EAGE Workshop on Fiber Optic Sensing for Energy Applications. All rights reserved.

关键词： Silicon photonics

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Recent progress of photodetector based on carbon nanotube film and application in optoelectronic integration

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Nano Research Energy 2023年第2期2卷 182-199页

作者： Xiang Cai Sheng Wang Lian-Mao Peng Key Laboratory for the Physics and Chemistry of Nanodevices and Center for Carbon-Based Electronics School of ElectronicsPeking UniversityBeijing 100871China State Key Laboratory of Advanced Optical Communication System and Networks School of ElectronicsPeking UniversityBeijing 100871China

Due to its remarkable electrical and optical capabilities,optoelectronic devices based on the semiconducting single-walled carbon nanotube(s-SWCNT)have been studied extensively in the last two ***,s-SWCNT is a direct bandgap semiconductor with a high infrared absorption coefficient and high electron/hole *** addition,as a typical one-dimensional material,there is no lattice mismatch between s-SWCNT and any *** advantage is that the optoelectronic devices of s-SWCNT can be processed at low temperatures.s-SWCNT has intriguing potential and applications in solar cells,light-emitting diodes(LEDs),photodetectors,and three-dimensional(3D)optoelectronic *** recent years,along with the advancement of solution purification technology,the high-purity s-SWCNTs film has laid the foundation for constructing large-area,homogenous,and high-performance optoelectronic *** this review,optoelectronic devices based on s-SWCNTs film and related topics are reviewed,including the preparation of high purity s-SWCNTs film,the progress of photodetectors based on the s-SWCNTs film,and challenges of s-SWCNTs film photodetectors.

关键词： carbon nanotube high purity semiconducting single-walled carbon nanotubes(s-SWCNTs)film photodetectors optoelectronic integration

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Low Latency Fiber Communication system Equalizer Based on Photonic Reservoir Computing

Low Latency Fiber Communication System Equalizer Based on Ph...

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2023 Asia communications and Photonics Conference/2023 International Photonics and Optoelectronics Meetings, ACP/POEM 2023

作者： Zuo, Xiaoyan Pei, Li Bai, Bing Bai, Bowen Wang, Jianshuai Sui, Juan Institute of Lightwave Technology Beijing Jiaotong University Key Laboratory of All-Optical Networks and Modern Communication Networks of Ministry of Education Beijing China School of Electronics Peking University State Key Laboratory of Advanced Optical Communications System and Networks Beijing China Technology Co. Ltd Beijing China

ISBN: (纸本)9798350312614

We demonstrate a low latency fiber channel distortion equalizer that implements mainly of the equalization calculations in the optical domain, based on an integrated photonic reservoir computing chip. We discussed the equalization effect of the equalizer under different dispersion noise and optical signal-to-noise ratio (OSNR) conditions. The bit error rate (BER) of the C-band with 25Gb/s on-off key (OOK) distorted signal in 25km standard single-mode fiber (SSMF) has been reduced by 3 orders of magnitude. By optimizing weights, this equalizer can adapt to link impairments. It can effectively equalize the distorted signals at data rates of 10-40 Gb/s over 25km in SSMF transmission. Furthermore, it can efficiently equalize the impaired signals after 5-40km SSMF transmission at a signal rate of 25Gb/s. © 2023 IEEE.

关键词： equalizer low latency photonic reservoir computing silicon photonics

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Intelligent Intra- and Inter-Channel Nonlinearity Compensation for Terabit-Per-Lambda 16QAM Long-Haul Transmission

Intelligent Intra- and Inter-Channel Nonlinearity Compensati...

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2023 Asia communications and Photonics Conference/2023 International Photonics and Optoelectronics Meetings, ACP/POEM 2023

作者： Fang, Xiansong Zhou, Lingjun Zhu, Yixiao Zheng, Jiayu Cai, Xiang Zhang, Fan School of Electronic and Computer Engineering Peking University Shenzhen China Shanghai Jiao Tong University State Key Laboratory of Advanced Optical Communication System and Networks Shanghai China School of Electronics Peking University State Key Laboratory of Advanced Optical Communication System and Networks Beijing China Pengcheng Laboratory Shenzhen China

We experimentally demonstrate the combination of learned modified DBP and adaptive equalizer to compensate for intra- and inter-channel nonlinearity, in an 8× 125Gbaud 16QAM system over 1600km SSMF, showing a 97.... 详细信息

ISBN: (纸本)9798350312614

关键词： fiber nonlinearity machine learning XPM

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Net 4×500Gb/s IM/DD optical Interconnects with Interleaved PDM and Probabilistic Shaping 49

Net 4×500Gb/s IM/DD Optical Interconnects with Interleaved ...

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49th European Conference on optical communications, ECOC 2023

作者： Fang, Xiansong Zhu, Yixiao Chen, Xinyu Cai, Xiang Hu, Weisheng Zhang, Fan State Key Laboratory of Advanced Optical Communication System and Networks Frontiers Science Centre for Nano-optoelectronics School of Electronics Peking University Beijing100871 China State Key Laboratory of Advanced Optical Communication System and Networks Shanghai Jiao Tong University Shanghai200240 China Peng Cheng Laboratory Shenzhen518055 China

ISBN: (纸本)9781839539954

We propose an interleaved PDM WDM IM/DD scheme avoiding carrier fading with only one optical filter and one photodiode per polarization. With probabilistic shaping, we demonstrate 4×500Gb/s IM/DD interconnects of WDM PDM PS-PAM-16 signals with net spectral efficiency 3.60 b/s/Hz. © The Institution of Engineering & Technology 2023.

关键词： optical interconnects

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