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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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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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Optical homodyne receiver utilizing image rejection in FSK/ASK re-modulation WDM-PON

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Chinese Optics Letters 2010年第9期8卷 906-908页

作者：方圆刘霄郑曦侯春宁方武良黄博李欣颖邹书敏张俊文邵宇丰迟楠 Department of Communication Science & Engineering State Key Laboratory of ASIC & System Fudan University

Optical frequency shift keying （FSK） homodyne detection utilizing image rejection in FSK/amplitude shift keying （ASK） re-modulation wavelength-division-multiplexed passive optical network （WDM-PON） is proposed and demonstrated. Image rejection is adopted to achieve better performance. We show the result in back-to-back and 40-km distance respectively and apparent improvement is obtained in the latter situation by using image rejection. Several factors which affect the image rejection receiver are analyzed in order to find out the optimum parameters. Result shows that the presented scheme is suitable for super long reach access network, especially for future metro access network.

关键词： Fiber optic networks Frequency shift keying Wavelength division multiplexing

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Low power discrete voltage assignment under clock skew scheduling 11

Low power discrete voltage assignment under clock skew sched...

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Asia and South Pacific Design Automation Conference

作者： Li Li Jian Sun Yinghai Lu Hai Zhou Xuan Zeng Electrical Engineering and Computer Science Department Northwestern University USA State Key Laboratory of ASIC & System Microelectronics Department Fudan University China

ISBN: (纸本)9781424475162

Multiple Supply Voltage (MSV) assignment has emerged as an appealing technique in low power IC design, due to its flexibility in balancing power and performance. However, clock skew scheduling, which has great impact on criticality of combinational paths in sequential circuit, has not been explored in the merit of MSV assignment. In this paper, we propose a discrete voltage assignment algorithm for sequential circuit under clock scheduling. The sequential MSV assignment problem is first formulated as a convex cost dual network flow problem, which can be optimally solved in polynomial time assuming delay of each gate can be chosen in continuous domain. Then a mincut-based heuristic is designed to convert the unfeasible continuous solution into feasible discrete solution while largely preserving the global optimality. Besides, we revisit the hardness of the general discrete voltage assignment problem and point out some misunderstandings on the approximability of this problem in previous related work. Benchmark test for our algorithm shows 9.2% reduction in power consumption on average, in compared with combinational MSV assignment. Referring to the continuous solution obtained from network flow as the lower bound, the gap between our solution and the lower bound is only 1.77%.

关键词： Delay Clocks Logic gates Power demand Sequential circuits Scheduling

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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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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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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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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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DRZ, DQPSK, and PoISK orthogonal modulations for 100Gbit/s transmission system applications

DRZ, DQPSK, and PoISK orthogonal modulations for 100Gbit/s t...

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Asia communications and Photonics Conference and Exhibition, ACP 2010

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

In this paper, we propose and demonstrate a novel 4-bit/symbol optical data format based on modulating dark return-to-zero (DRZ), differential quadrature phase-shift keying (DQPSK) and polarization-shift-keying (PoISK... 详细信息

ISBN: (纸本)9781424471119

关键词： Quadrature phase shift keying

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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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