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arXiv 2019年

作者： Huang, Huanhuan Ye, Tong Lee, Tony T. State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai 200240 China Shenzhen China

In this paper, we study the throughput and delay performances of the slotted Aloha with batch service, which has wide applications in random access networks. Different from the classical slotted Aloha, each node in the slotted Aloha with batch service can transmit up to M packets once it succeeds in channel competition. The throughput is substantially improved because up to M packets jointly undertake the overhead due to contention. In an innovative vacation model developed in this paper, we consider each batch of data transmission as a busy period of each node, and the process between two successive busy periods as a vacation period. We then formulate the number of arrivals during a vacation period in a renewal-type equation, which characterizes the dependency between busy periods and vacation periods. Based on this formulation, we derive the mean waiting time of a packet and the bounded delay region for the slotted Aloha with batch service. Our results indicate the throughput and delay performances are substantially improved with the increase of batch sizeM, and the bounded delay region is enlarged accordingly. As M goes to infinity, we find the saturated throughput can approach 100% of channel capacity, and the system remains stable irrespective of the population size and transmission probability. Copyright © 2019, The Authors. All rights reserved.

关键词： Population statistics

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Intelligent electromagnetic sensing with learnable data acquisition and processing

arXiv

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arXiv 2019年

作者： Li, Hao-Yang Zhao, Han-Ting Wei, Meng-Lin Ruan, Heng-Xin Shuang, Ya Cui, Tie Jun Li, Lianlin State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronics Peking University Beijing100871 China State Key Laboratory of Millimeter Waves Southeast University Nanjing210096 China

Electromagnetic (EM) sensing is a wide-spread contactless examination technique in science, engineering and military. However, conventional sensing systems are mostly lack of intelligence, which not only require expensive hardware and complicated computational algorithms, but also pose important challenges for advanced in-situ sensing. To address this shortcoming, we propose the concept of intelligent sensing by designing a programmable metasurface for data-driven learnable data acquisition, and integrating it into a data-driven learnable data processing pipeline. This strategy allows to learn an optimal sensing chain in systematic sense of variational autoencoder, i.e., to jointly learn an optimal measurement strategy along with matching data post processing schemes. A three-port deep artificial neural network (ANN) is designed to characterize the measurement process, such that an optimal measurement strategy is adaptive to the subject of interest by controlling the programmable metasurface for manipulating the EM illuminations. We design and fabricate a proof-of-principle sensing system in microwave, and demonstrate experimentally its significance on the high-quality imaging and high-accuracy object recognition from a remarkably reduced number of measurements. We faithfully expect that the presented methodology will provide us with a fundamentally new perspective on the design of intelligent sensing architectures at various frequencies, and beyond. Copyright © 2019, The Authors. All rights reserved.

关键词： Data acquisition

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All-optical Mach-Zehnder Switch on a Graphene-on-silicon Nitride Chip

All-optical Mach-Zehnder Switch on a Graphene-on-silicon Nit...

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Progress in Electromagnetics Research Symposium - Fall (PIERS - FALL)

作者： C. Zhang T. Guo C. Y. Qiu State Key Lab of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai China

ISBN: (数字)9781728153049

ISBN: (纸本)9781728153056

All-optical switches play an important role in optical cross-connects and optical communication networks. With the advantage of light-controlling-light, all-optical switches could be used for achieving an efficient light signal processing, which avoids the conversion between optical signals and electronic signals. Silicon nitride (Si 3 N 4 ) is an ideal candidate for all-optical devices with a low optical loss, since Si 3 N 4 has a large bandgap of ~ 5eV and doesn't have two- photon absorption (TPA) effect as well as the free-carrier absorption (FCA) effect in the C-band. However, Si 3 N 4 has a weak thermooptic effect, and thus it is still hard to implement an all-optical high-efficient Si 3 N 4 switch based on the thermo-optic effect. In this paper, an all-optical Mach- Zehnder switch on graphene-on-Si 3 N 4 chip is proposed and experimentally demonstrated. In our device, the Mach-Zehnder switch is based on the Si 3 N 4 waveguide. And the graphene overlies one of the two arms of the switch. Then, the graphene can absorb the pump light and convert the light power into heat, which in turn changes the refractive index of the Si 3 N 4 underneath based on the thermo-optic effect. In this case, for the probe signal light, the phase delay of the arm is tuned and optical switching is then implemented. Note that, in this process, the weakness of the thermo-optic effect and thermal conductivity of Si 3 N 4 is compensated by graphene due to its high thermal conductivity. In the experimental demonstration, all optical switching with an extinction ratio of 15 dB is demonstrated while the device footprint is ~ 0.24 mm 2 . Furthermore, a tuning efficiency of 0.0112 π/mW is implemented with a switching power of 89.1 mW, which is much higher than many other thermo-optic switches. Note that, the proposed device configuration may provide a simple and effective way to realize all-optical high-efficient light control.

关键词： optical switches optical waveguides Graphene optical pumping optical refraction optical variables control

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Quantum advantage with timestamp membosonsampling

arXiv

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arXiv 2020年

作者： Gao, Jun Wang, Xiao-Wei Zhou, Wen-Hao Jiao, Zhi-Qiang Ren, Ruo-Jing Fu, Yu-Xuan Qiao, Lu-Feng Xu, Xiao-Yun Zhang, Chao-Ni Pang, Xiao-Ling Li, Hang Wang, Yao Jin, Xian-Min School of Physics and Astronomy State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai200240 China CAS Center for Excellence Synergetic Innovation Center in Quantum Information and Quantum Physics University of Science and Technology of China HefeiAnhui230026 China

Quantum computer, harnessing quantum superposition to boost a parallel computational power, promises to outperform its classical counterparts and offer an exponentially increased scaling. The term "quantum advantage" was proposed to mark the key point when people can solve a classically intractable problem by artificially controlling a quantum system in an unprecedented scale, even without error correction or known practical applications. Boson sampling, a problem about quantum evolutions of multi-photons on multimode photonic networks, as well as its variants, has been considered as a promising candidate to reach this milestone. However, the current photonic platforms suffer from the scaling problems, both in photon numbers and circuit modes. Here, we propose a new variant of the problem, timestamp membosonsampling, exploiting the timestamp information of single photons as free resources, and the scaling of the problem can be in principle extended to infinitely large. We experimentally verify the scheme on a self-looped photonic chip inspired by memristor, and obtain multi-photon registrations up to 56-fold in 750,000 modes with a Hilbert space up to 10254. Our work exhibits an integrated and cost-efficient shortcut stepping into the "quantum advantage" regime in a photonic system far beyond previous scenarios, and provide a scalable and controllable platform for quantum information processing. © 2020, CC BY.

关键词： Quantum optics

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Distributed Dynamic Strain Measurement with High Repetition Rate Based on Dual-slope-assisted BOCDA

Distributed Dynamic Strain Measurement with High Repetition ...

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Asia communications and Photonics Conference

作者： Bin Wang Xinyu Fan Zuyuan He State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai 200240 China

We propose and demonstrate a dual-slope-assisted BOCDA system with centimeter-level spatial resolution and kHz-level repetition rate. As a demonstration, dynamic strains with frequencies up to 100 Hz have been measure... 详细信息

ISBN: (纸本)9781943580705

关键词： Diode lasers Distributed feedback lasers Fiber optic sensors Spatial resolution Strain measurement Variable optical attenuators

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50-Gb/s TDM-PON based on 10G-class devices by optics-simplified DSP

50-Gb/s TDM-PON based on 10G-class devices by optics-simplif...

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optical Fiber communication Conference, OFC 2018

作者： Xue, Lei Yi, Lilin Li, Peixuan Hu, Weisheng State Key Lab of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai200240 China

We demonstrate a 50-Gb/s PAM-4 TDM-PON over 25-km SSMF based on DML and APD with 6-GHz 3-dB bandwidth in O-band. Dispersion-supported optical equalization is used to reduce the complexity of FFE and Volterra algorithm... 详细信息

ISBN: (纸本)9781943580385

关键词： Passive optical networks

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56 Gbps IM/DD PON based on 10G-class optical devices with 29 dB loss budget enabled by machine learning

56 Gbps IM/DD PON based on 10G-class optical devices with 29...

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optical Fiber communication Conference, OFC 2018

作者： Li, Peixuan Yi, Lilin Xue, Lei Hu, Weisheng State Key Lab of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai200240 China

We demonstrate 56Gbps PAM4 PON transmission over 25km SSMF using 10G-class DML and APD with 6 GHz 3-dB bandwidth. 29 dB loss budget is achieved by a novel equalization technique based on convolutional neural network. ... 详细信息

ISBN: (纸本)9781943580385

关键词： Budget control

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The Acquisition of Sand Vibration Information in Hinterland of Desert Based on advanced Remote Sensing system and Network Technologies

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Journal of Shanghai Jiaotong university(Science) 2018年第1期23卷 28-32页

作者：马鑫邓顺戈李新碗 State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic Engineering University of Michigan-Shanghai Joint Institute Shanghai Institute for Advanced Communication and Data Science Shanghai Jiao Tong UniversityShanghai 200240China

The deep understanding on sand and sand dunes scale can be useful to reveal the formation mechanism of the sandstorm for early sandstorm forecast. The current sandstorm observation methods are mainly based on conventional meteorological station and satellites remote sensing, which are difficult to acquire sand scale information. A wireless sensing network is implemented in the hinterland of desert, which includes ad hoc network,sensor, global positioning system(GPS) and system integration technology. The wireless network is a three-layer architecture and daisy chain topology network, which consists of control station, master robots and slave *** three robots including one master robot and its two slave robots forms an ad hoc network. Master robots directly communicate with radio base station. Information will be sent to remote information center. Data sensing system including different kinds of sensors and desert robots is developed. A desert robot is designed and implemented as unmanned probing movable nodes and sensors' carrier. A new optical fiber sensor is exploited to measure vibration of sand in particular. The whole system, which is delivered to the testing field in hinterland of desert(25 km far from base station), has been proved efficient for data acquisition.

关键词： sandstorm sand-scale information optical fiber sensor desert robot wireless sensor network

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Switching response of dual-output Mach–Zehnder modulator in channel-interleaved photonic analog-to-digital converter

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Chinese Optics Letters 2018年第12期16卷 16-19页

作者： Lei Yu Weiwen Zou Guang Yang Xinwan Li Jianping Chen Jianping Chen State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic EngineeringShanghai Jiao Tong University State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic EngineeringShanghai Jiao Tong University

This Letter theoretically and experimentally studies the response of photonic switching in a channel-interleaved photonic analog-to-digital converter(PADC) with high sampling rate and wide input frequency range. A figure of merit(FoM) is introduced to evaluate the switching response of the PADC when a dual-output Mach–Zehnder modulator(MZM) serves as the photonic switch to parallelize the sampled pulse train into two channels. After the optimization of the FoM and utilization of the channel-mismatch compensation algorithm,the system bandwidth of PADC is expanded and the signal-to-distortion ratio is enhanced.

关键词： Zehnder modulator in channel-interleaved photonic analog-to-digital converter Switching response of dual-output Mach MZM

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Tunable optomechanically induced sideband comb

arXiv

引用

arXiv 2020年

作者： Liu, Jun-Hao He, Guangqiang Wu, Qin Yu, Ya-Fei Wang, Jin-Dong Zhang, Zhi-Ming South China Normal University Guangzhou510006 China Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials South China Normal University Guangzhou510006 China State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai200240 China School of Biomedical Engineering Guangdong Medical University Dongguan523808 China

Cavity optomechanical system can exhibit higher-order sideband comb effect when it is driven by a control field ωc and a probe field ωp, and works in the non-perturbative regime, as was shown in a previous work [Xiong et al., Opt. Lett. 38, 353 (2013)]. The repetition frequency of such a comb is equal to the mechanical frequency ωb and is untunable, which limits the precision of the comb. Here we address this problem by driving the system with an additional strong probe field ωf, and the detuning between ωf and ωc is equal to ωb/n (here n is an integer), i.e., this detuning is a fraction of the mechanical frequency. In this case, we obtain some interesting results. We find that not only the integer-order (higher-order) sidebands, but also the fraction-order sidebands, and the sum and difference sidebands between the integer- and fraction-order sidebands, will appear in the output spectrum. The generated nonlinear sidebands constitute an optomechanically induced sideband comb (OMISC). The frequency range and the repetition frequency of the OMISC are proportional to the sideband cutoff-order number and the sideband interval, respectively. We show that we can extend the frequency range of the OMISC by increasing the intensity of the probe field ωp. More importantly, we can decrease the repetition frequency, and consequently, improve the precision of the OMISC by increasing n and the intensity of the probe field ωf. Copyright © 2020, The Authors. All rights reserved.

关键词： Cutoff frequency

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