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Novel orthogonal modulation format DRZ-FSK/DPSK for high-speed long-haul optical communication

Chinese Optics Letters 2010年第9期8卷 852-855页

作者：张俊文邵宇丰方武良黄博陶理朱江波迟楠 State Key Lab of ASIC & System Department of Communication Science and Engineering Fudan University

We propose a novel advanced orthogonal modulation format dark return-to-zero frequency shift keying/differential phase shift keying （DRZ-FSK/DPSK） and its realization scheme. The DRZ-FSK/DPSK is generated by the combination of a 40-Gb/s return-to-zero （RZ） signal and a DRZ signal which is converted from the RZ using a semiconductor optical amplifier （SOA） based on nonlinear cross polarization rotation （XPR） and then re-modulated by high-bit-rate DPSK at 40 Gb/s. The feasibility of the scheme is exper-imentally demonstrated. Bit error rate （BER） results of the total 80-Gb/s DRZ-FSK/DPSK orthogonal modulation signal with a subsequent 100-km single-mode fiber （SMF） transmission link show its potential for future high-speed long-haul optical communication.

关键词： Bit error rate Light amplifiers Modulation Phase shift keying

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1.96 Tb/s (21$\,\times\,$100 Gb/s) OFDM Optical Signal Generation and Transmission Over 3200-km Fiber

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IEEE Photonics Technology Letters 2011年第15期23卷 1061-1063页

作者： Jianjun Yu Ze Dong Nan Chi ZTE Inc. Beijing China Department of Communication Science and Engineering State Key Laboratory of ASIC & System Fudan University Shanghai China Hunan University Hunan China Georgia Institute of Technology Atlanta GA USA Fudan University Shanghai China

A novel scheme to generate coherent 21 optical subcarriers with fixed frequency of 25 GHz is proposed and experimentally demonstrated. Using these optical subcarriers, we have successfully generated 1.96 Tb/s (21 × 100 Gb/s) polarization-multiplexing optical orthogonal frequency multiplexed (PM-OFDM) polarization multiplexed quadrature phase-shift keying (QPSK) optical superchannel signal with optical signal-noise ratio of each subchannel larger than 30 dB (0.1-nm bandwidth). We have transmitted this 1.96-Tb/s optical OFDM superchannel over 3200-km SMF-28 with amplification span of 80 km with erbium-doped fiber amplifier-only.

关键词： Optical polarization Optical fibers Optical amplifiers Optical filters Optical modulation Phase modulation

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A Modulation Scheme for 100Gb/s Minimum-Shift keying Format based on Imbalanced Bias in IQ Components

A Modulation Scheme for 100Gb/s Minimum-Shift Keying Format ...

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Optical Fiber communication Conference and Exposition

作者： Li Tao Yufeng Shao Junwen Zhang Jiangbo Zhu Nan Chi Department of Communication Science and Engineering and State Key Lab of ASIC & System Fudan University

We propose an optical MSK modulation scheme to achieve the 100Gb/s MSK signal with constant envelope and continuous temporal phase shift. The investigation on the transmission performance clearly demonstrates the feas... 详细信息

ISBN: (纸本)9781457702136

关键词： Modulation Optical communications

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Analysis of smooth phase modulation formats compared with conventional QPSK and BPSK using coherent detection

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Chinese Optics Letters 2010年第9期8卷 856-858页

作者：黄博迟楠邵宇丰张俊文朱江波李蔚刘文 Wuhan National Laboratory for Optoelectronics School of Optoelectronic Science and Engineering Huazhong University of Science and Technology Department of Communication Science and Engineering and State Key Laboratory of ASIC and System Fudan University

Novel optical offset quadrature phase shift keying （OQPSK） and improved minimum-shift keying （MSK） modulation schemes to smooth optical phase hopping for high speed fiber optics transmission are proposed. Simulations have been done among the MSK, OQPSK, quadrature phase shift keying （QPSK）, and binary phase-shift keying （BPSK） modulation formats at 40 Gb/s over 100-km transmission link using coherent detection. Simulation results present good performances to elevate chromatic dispersion tolerance and reduce the influence of nonlinear effects by adopting the smooth phase modulation formats. Inter-symbol interference decreases for the fast side-lobe property and tight spectrum as a result of avoding the π phase shift and reducing envelop fluctuation.

关键词： Modulation Phase shift

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Time Petri net model with mixed semantics

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Ruan Jian Xue Bao/Journal of Software 2011年第6期22卷 1199-1209页

作者： Pan, Li Ding, Zhi-Jun Guo, Guan-Qi School of Information and Communication Engineering Hu'nan Institute of Science and Technology Yueyang 414006 China Department of Computer Science and Technology Tongji University Shanghai 200092 China State Key Laboratory of Software Engineering Wuhan University Wuhan 430072 China

This paper presents a time Petri net (TPN) model with mixed semantics that efficiently addresses the schedulability analysis problem of the existing semantics models. The proposed model associates each firable transition with a mandatory firing point that is set to the least upper bound of the transition and its non-conflicting transitions. This treatment not only eliminates the effect of conflicting transitions on the transition friability and extends the scheduling scope of the TPN model, but also ensures the time limit of the task scheduling. To determine the expressiveness of the mixed model, the study proves that the mixed semantics model has the power of Turing machines and its marking reachability problem is undecidable. The timed expressiveness of three semantics models with respect to timed language acceptance is also compared. A state class approach is then proposed for the scheduling analysis of the mixed model. Finally, a flexible manufacturing system is used as an example to compare the scheduling ability of three semantics models. ©2011 ISCAS.

关键词： Semantics

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A Novel Scheme for Seamless Integration of ROF system with OFDM-CPM WDM Passive Optical Network

A Novel Scheme for Seamless Integration of ROF System with O...

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Optical Fiber communication Conference and Exposition

作者： Yufeng Shao Nan Chi Junwen Zhang Li Tao Bo Huang Wuliang Fang State Key Lab of ASIC & System and Department of Communication Science and Engineering Fudan University Shanghai 200433 China

A novel scheme to generate, transmit and receive an optical OFDM-CPM signal in the architecture for seamless integration of ROF system with 4 × 2.5Gb/s WDM-PON is proposed and experimentally validated.

ISBN: (纸本)9781457702136

关键词： seamless integration Passive optical networks Wavelength division multiplexing TRANSMITTING Building construction ARCHITECTURE

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Nanoimprint of ordered ferro/piezoelectric P(VDF-TrFE) nanostructures

Nanoimprint of ordered ferro/piezoelectric P(VDF-TrFE) nanos...

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作者： Fang, Jiang-Rong Shen, Zhen-Kui Yang, Shen Lu, Qian Li, Jinxing Chen, Yi-Fang Liu, Ran State Key Lab of ASIC and System Department of Microelectronics Fudan University Shanghai 200433 China Department of Material Science Fudan University Shanghai 200433 China Rutherford Appleton Laboratory Chilton Didcot Oxfordshire OX11 0QX United Kingdom Micro and Nanotechnology Centre United Kingdom School of Microelectronics Fudan University 220 Handan Road Shanghai China

The next generation of portable computing and communication devices tremendously depend on the technologies that enable the rapid manipulation, caching and high-density non-volatile data storage. The recent development of organic electronics requires high-quality organic memory compatible with other devices, which will eventually lead to the realization of all organic electronic systems. The challenge of the organic electronics application is to find less degradative ways of fabricating ferroelectric polymer nanostructures. In this work, we applied the nanoimprint technique to fabricate ferroelectric poly(vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)] copolymer line and dot nanostructures and compared the ferroelectric properties and domain formation in these two nanostructures. © 2011 Elsevier B.V. All rights reserved.

关键词： Nanostructures

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Quantum-limited phase-matching effect in a Λ-type laser system

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Physical Review A 2011年第6期83卷 063846-063846页

作者： Deshui Yu Jingbiao Chen Department of Applied Physics The University of Tokyo Bunkyo-ku Tokyo 113-8656 Japan Institute of Quantum Electronics and State Key Laboratory of Advanced Optical Communication System & Network School of Electronics Engineering & Computer Science Peking University Beijing 100871 P.R. China

The theory of a quantum-limited phase-matching effect in a Λ-type lasing system is studied in detail based on the quantum Langevin approach. Two quasimonochromatic fields are directly generated based on two lasing transitions. We find that the coherence between two lasers can well exceed the linewidth of either laser field. This result denotes that two field phases match each other although either laser field has a high phase fluctuation. Unlike the phase-matching effect based on atomic absorption, the final coherence between two laser fields here is not limited by saturation broadening, and the higher laser intensities lead to a higher coherence. Additionally, based on a linear stability analysis, we find that the instability of the field steady state can substantially restrict the occurrence of this phase-matching effect in the bad-cavity limit for a high pump rate. We also discuss the spectrum of amplitude fluctuations of output fields, and the result shows that the squeezing of amplitude fluctuations at low frequencies for a single field oscillating inside the cavity is damaged in the case of two fields oscillating.

关键词： LASERS LIGHT amplifiers OPTOELECTRONIC devices NONLINEAR optics BASES (Linear topological spaces)

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Nanoscale control of domain arrangements in Pb(Zr0.3,Ti 0.7)O3 ferroelectric films

Nanoscale control of domain arrangements in Pb(Zr0.3,Ti 0.7)...

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作者： Shen, Zhen-Kui Lu, Qian Chen, Zhi-Hui Jiang, An-Quan Qiu, Zhi-Jun Qu, Xin-Ping Chen, Yi-Fang Liu, Ran State Key Lab of ASIC and System Fudan University Shanghai 200433 China China Department of Material Science Fudan University Shanghai 200433 China China Rutherford Appleton Laboratory Chilton Didcot Oxfordshire OX11 0QX UK United Kingdom Nanoscience and Nanotechnology Micro and Nanotechnology Centre Rutherford Appleton Laboratory Oxfordshire United Kingdom School of Microelectronics Fudan University 220 Handan Road Shanghai China

Arrays of ferroelectric PZT nanostructures with lateral size down to 500 nm were fabricated using nanoembossing technique. The static distribution of domain configurations was investigated by Piezoresponse Force Microscopy (PFM). The observed presence of patterned domains following the patterned morphology suggests that nanoembossing could be used as a potential method for nanoscale control of domain arrangements in ferroelectrics nanostructures. © 2011 Elsevier B.V. All rights reserved.

关键词： Ferroelectricity

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Modeling and analysis of SU-CoMP HARQ in 3GPP LTE system level simulation

Modeling and analysis of SU-CoMP HARQ in 3GPP LTE system lev...

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International Conference on communications and Networking in China (CHINACOM)

作者： Yuan Gao Yi Li Hongyi Yu Shihai Gao Xianfeng Wang State Key Laboratory on Microwave and Digital Communications National Laboratory for Information Science and Technology Tsinghua University Beijing China Department of Communication Engineering Information Science and Technology Institute Zhengzhou China

ISBN: (纸本)9781457701009

Coordinated multipoint transmission/reception (CoMP) is widely used to increase the cell-edge user performance in 3GPP LTE and its related workgroups. However, the standardization of CoMP has been freezed in around 2009 and researches on CoMP HARQ process have not come to any conclusions. In this paper, we studied the Single-User (SU) CoMP downlink Hybrid-ARQ (HARQ) process in non-coherent CoMP mode, and designed a SINR based dynamic retransmission link selection scheme that the retransmission packet will be transmitted using the best transmission link, which is proved can increase the target user (commonly the cell edge user) throughput in given scenario. Simulation results show that our new method of CoMP-HARQ can effectively reduce retransmission times and increase cell-edge user throughput. Conclusions have been given under our Matlab based LTE system level simulator.

关键词： Throughput Analytical models Interference Signal to noise ratio Mathematical model Simulation Indexes

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