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International Conference on Transparent optical networks

作者： Xuelin Yang Peng Zhou Xiaonan Hu Weisheng Hu Yong Liu State Key Lab of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai 200240 P.R. China School of Optoelectronic Information University of Electronic Science and Technology of China Chengdu 610054 P.R. China

ISBN: (纸本)9781479956029

We propose a detailed frequency-domain model of the all-optical turbo-switch incorporating two cascaded semiconductor optical amplifiers (SOAs) with a broad band-pass optical filter in between the SOAs. The frequency-domain SOA model has taken the spatial inhomogeneity of the saturated SOA gain associated with the pump optical field into consideration for the first time. The simulations based on the model have been presented to understand the reason of the bandwidth enhancement and to predict the 3-dB bandwidth of frequency response of the turbo-switch. With the optimization of the optical powers, waveguide loss and a delayed-interferometer, the 3-dB bandwidth of turbo-switch can reach up to 270 GHz.

关键词： semiconductor optical amplifier all-optical signal processing high-speed switches

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Experimental demonstrations of symmetirc 40-Gb/s TWDM-PON

Experimental demonstrations of symmetirc 40-Gb/s TWDM-PON

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International Conference on Information, communications and Signal Processing

作者： Lilin Yi Zhengxuan Li Meihua Bi Hao He Wei Wei Shilin Xiao Weisheng Hu State Key Lab of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai China

We have experimentally demonstrated symmetric 40Gb/s TWDM-PON with long passive reach and high power budget. Directly-modulated lasers (DMLs) are used as both downstream and upstream lasers to reduce the system cost, and optical reshaping filter is used to manage the chirp of the DMLs for all the upstream and downstream channels, enabling long distance transmission without dispersion compensation. The power budget is as high as 43 dB for 100-km passive reach, supporting 64 users.

关键词： Passive optical networks optical fiber filters optical network units Chirp Sensitivity optical fibers

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First demonstration of symmetric 40-Gb/s TWDM-PON with 100-km passive reach and 1024-split using direct modulation and direct detection

First demonstration of symmetric 40-Gb/s TWDM-PON with 100-k...

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Asia communications and Photonics Conference, ACP 2013

作者： Yi, Lilin Li, Zhengxuan Hu, Weisheng Yang, Xuelin Xiao, Shilin He, Hao Han, Jun Gong, Mingjun Shen, Chengbin State Key Lab of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai 200240 China Oclaro Communication Technologies Co. Ltd. Shanghai 200253 China China Telecom Corporation Ltd. Shanghai Research Institute 200122 China

We propose and demonstrate a symmetric 40-Gb/s TWDM-PON supporting 100-km passive reach, 1024 split by using cost-effective direct modulation and direct detection for both upstream and downstream directions, without a... 详细信息

ISBN: (纸本)9781557529893

关键词： Cost effectiveness

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Pipeline structure Schnorr-Euchner Sphere Decoding Algorithm

Pipeline structure Schnorr-Euchner Sphere Decoding Algorithm

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The 9th International Conference on Wireless communications,Networking and Mobile Computing(WICOM 2013)

作者： Xinyu Mao Jianjun Wu Haige Xiang State Key Laboratory of Advanced Optical Communication Systems & Networks School of Electronics Engineering and Computer SciencePeking University

We propose a pipeline structure for Schnorr-Euchner sphere decoding algorithm in this article. It divides the search tree of the original algorithm into blocks and executes the search from block to block. When one block search of a signal is over, the part in the pipeline structure that processes this block search can load another signal and search. Several signals can be processed at the same time in one pipeline. Blocks are arranged to lower the whole complexity in the way that the previously search blocks are the blocks those have more probability to generate the final solution. Simulation experiment results show the average process delay can drop to the range from 48.77% to 60.18% in a 4-by-4 antenna system with 16QAM modulation, or from 30.31% to 61.59% in a 4-by-4 antenna system with 64QAM modulation.

关键词： Multiple-Input Multiple-Output system Schnorr-Euchner Sphere Decoding Pipeline Structure

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A Novel Method with Martingale Theory for Phase Noise Analysis in Coherent optical communication

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Optics and Photonics Journal 2013年第2期3卷 171-174页

作者： Chengle Sui Qiangmin Wang Shilin Xiao Pingqing Li School of Information Security Engineering Shanghai Jiao Tong University Shanghai China State Key Lab of Advanced Optical Communication System and Networks Shanghai Jiao Tong University Shanghai China

Phase noise has a great influence on the performance of coherent optical communication. In this paper, martingale theory is introduced to analyze the phase noise effect for the first time as far as we know. Through Fubini’s Theory and martingale representation theory, we proved that , which denotes the phase noise effect, is a predictable martingale. Then Ito’s formula for solution to stochastic differential equation is utilized for the analysis of phase noise effect. Using our method, a nonrecursive formula for the moments of phase noise is derived and signal-noise-ratio (SNR) degradation in coherent optical OFDM due to phase noise is calculated with our method.

关键词： Martingale Brownian Motion Ito Itegral Derivation of Moments Phase Noise

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Analysis of Microdisk/Microring's Surface Roughness Effect by Orthogonal Decomposition

Analysis of Microdisk/Microring's Surface Roughness Effect b...

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The International Symposium on Photonics and Optoelectronics(SOPO 2013)

作者： Chengle Sui Qiangmin Wang Shilin Xiao Pingqing Li State Key Lab of Advanced Optical Communication System and Networks Shanghai Jiao Tong University School of Information Security Engineering Shanghai Jiao Tong University

Application of micro-resonator is limited by different types of surface inhomogeneity. The 1-th derivative of inho-mogeneity (i.e. △r'(φ)) affects the wave transport as well as the height of inhomogeneity (i.e. △r(φ)). A method based on orthogonal decomposition is proposed to analysis both scattering mechanism respectively. Then surface roughness effect on Q-factor of micro-disk waveguide gallery mode (WGM) resonator is investigated with our method and the analysis fits well with FDTD simulation results.

关键词： Orthogonal Decomposition Micro-resonator Surface Roughness Effect

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Analysis of Microdisk/Microring’s Surface Roughness Effect by Orthogonal Decomposition

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Optics and Photonics Journal 2013年第2期3卷 288-292页

Application of micro-resonator is limited by different types of surface inhomogeneity. The 1-th derivative of inhomogeneity (i.e. Δrˊ(φ)) affects the wave transport as well as the height of inhomogeneity (i.e. Δrˊ(φ)). A method based on orthogonal decomposition is proposed to analysis both scattering mechanism respectively. Then surface roughness effect on Q-factor of micro-disk waveguide gallery mode (WGM) resonator is investigated with our method and the analysis fits well with FDTD simulation results.

关键词： Orthogonal Decomposition Micro-resonator Surface Roughness Effect

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A Novel Method with Martingale Theory for Phase Noise Analysis in Coherent optical communication

A Novel Method with Martingale Theory for Phase Noise Analys...

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The International Symposium on Photonics and Optoelectronics(SOPO 2013)

Phase noise has a great influence on the performance of coherent optical communication. In this paper, martingale theory is introduced to analyze the phase noise effect for the first time as far as we know. Through Fubini's Theory and martingale representation theory, we proved that 1/T∫t0 exp(jws )·l(s)ds, which denotes the phase noise effect, is a pre-dictable martingale. Then Ito's formula for solution to stochastic differential equation is utilized for the analysis of phase noise effect. Using our method, a nonrecursive formula for the moments of phase noise is derived and signal-noise-ratio (SNR) degradation in coherent optical OFDM due to phase noise is calculated with our method.

关键词： Martingale Brownian Motion Ito Itegral Derivation of Moments Phase Noise

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Dynamics of tripartite geometric quantifiers of correlations in a quantum spin system

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Physical Review A 2013年第6期87卷 062315-062315页

作者： Jiang Zhou Hong Guo []The State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science and Center for Computational Science and Engineering Peking University Beijing 100080 People's Republic of China

We derive an exact formula of geometric measure of quantum discord (GMQD) for an arbitrary 3-qubit state. The dynamics of GMQD in a quantum spin system coupled to a thermal bath is studied by simulation and analytical approximation. It is found that tripartite quantum discord has distinct time behaviors within two different eigenspaces. Further, we extend the square norm distance to define tripartite geometric quantifiers of total and classical correlations. We obtain their explicit expressions and discuss the possibility of having a closed additive relation among various kinds of correlations during the dynamical evolution.

关键词： QUBITS QUANTUM states OPTICS RESEARCH QUANTUM spin models

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A novel solution to improve uplink synchronization control in OFDM-based mobile networks

A novel solution to improve uplink synchronization control i...

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IEEE Conference on Wireless communications and Networking

作者： Wei Luo Anpeng Huang Linzhen Xie Tammy Chang State Key Lab of Advanced Optical Communication Systems and Networks Peking University China Department of Electrical Engineering Stanford University CA USA

ISBN: (纸本)9781467359382

In OFDM-based mobile networks, uplink synchronization is essential in order for an eNB (evolved Node Base station) to handle a variety of interference issues. To guarantee uplink synchronization control, the HARQ (Hybrid Automatic Repeat-reQuest) mechanism is applied into the process of its TAC (Timing Advance Command) transmission in current standards. But HARQ conflicts with the TAC scheduling mechanism in nature, because TAC control information is typically scheduled for transmission at the end of a synchronization period in order to save signaling overhead by reducing TAT (Time Alignment Timer) restart frequency. To handle the conflict between the extra HARQ retransmission delay and TAC scheduling mechanism, we propose a novel TO (Time Offset)-TAC solution that can remove the side effects from TAC information delivery caused by the extra delay of HARQ retransmission. We conduct system-level simulation experiments to evaluate our proposal's performance gain. Results demonstrate that our solution can avoid losing synchronization due to its TAT expiration, at a slight penalty of signaling overhead. This study is the first effort at addressing how to guarantee uplink time alignment in the control layer, which is the basis for suppressing interference from “time-staggered symbols” among multiple paths.

关键词： Synchronization Uplink Delays Mobile communication Mobile computing Proposals

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