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11th Conference on Lasers and Electro-Optics Pacific Rim, CLEO-PR 2015

作者： Ma, Yuxuan Liu, Yizhou Kong, Ziyun Zhao, Fei Li, Chen Jiang, Tongxiao Wang, Aimin Zhao, Gang Zhang, Zhigang State Key Laboratory of Advanced Optical Communication System and Networks School of Electronics Engineering and Computer Science Peking University Beijing100871 China National Astronomical Observatories Chinese Academy of Sciences Beijing100871 China

We demonstrate an astro-comb for relatively low resolution astronomical spectrographs. The space of comb lines is Altered to 30 GHz by a Fabry-Perot cavity spaced by an ULE glass. The radial velocity precision is ... 详细信息

ISBN: (纸本)9781467371094

关键词： Spectrographs

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Lowering the energy consumption in silicon photonic devices and systems [Invited]

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Photonics Research 2015年第5期3卷 28-46页

作者： Zhiping Zhou Bing Yin Qingzhong Deng Xinbai Li Jishi Cui State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science Peking University

We review current silicon photonic devices and their performance in connection with energy *** critical issues are identified to lower energy consumption in devices and systems: reducing the influence of the thermo-optic effect, increasing the wall-plug efficiency of lasers on silicon, optimizing energy performance of modulators, and enhancing the sensitivity of photodetectors. Major conclusions are(1) Mach–Zehnder interferometer-based devices can achieve athermal performance without any extra energy consumption while microrings do not have an efficient passive athermal solution;(2) while direct bonded III–V-based Si lasers can meet system power requirement for now, hetero-epitaxial grown III–V quantum dot lasers are competitive and may be a better option for the future;(3) resonant modulators, especially coupling modulators, are promising for low-energy consumption operation even when the power to stabilize their operation is included;(4) benefiting from high sensitivity and low cost, Ge/Si avalanche photodiode is the most promising photodetector and can be used to effectively reduce the optical link power budget. These analyses and solutions will contribute to further lowering energy consumption to meet aggressive energy demands in future systems.

关键词： Invited Lowering the energy consumption in silicon photonic devices and systems MZI

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Simultaneous microwave frequency transfer and time synchronization based mode-locked pulse train over 120 km fiber 11

Simultaneous microwave frequency transfer and time synchroni...

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11th Conference on Lasers and Electro-Optics Pacific Rim, CLEO-PR 2015

作者： Chen, Xing Lu, Jinlong Zhang, Jian Cui, Yifan Lu, Xing Tian, Xusheng Ci, Cheng Liu, Bo Wu, Hong Tang, Tingsong Shi, Kebin Zhang, Zhigang State Key Laboratory of Advanced Optical Communication System Networks School of Electronics Engineering and Computer Science Peking University Beijing100871 China State Key Laboratory for Mesoscopic Physics School of Physics Peking University Beijing100871 China School of Electronic Information and Optical Engineering Nankai University Tianjin300071 China Beijing Satellite Navigation Center Beijing100094 China

We demonstrate feed-forward digital compensation technique applied in both precise frequency transfer and time synchronization. The fractional frequency instability was 6.18×10-20 at 2000 s and RMS variation of t... 详细信息

ISBN: (纸本)9781467371094

关键词： Synchronization

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Linearization of broadband frequency sweep for temperature tuned DFB laser using an optoelectronic feedback loop

Linearization of broadband frequency sweep for temperature t...

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Asia communications and Photonics Conference, ACPC 2015

作者： Qin, Jie Zhou, Qian Xie, Weilin Dong, Yi Hu, Weisheng State Key Laboratory of Advanced Optical Communication System and Networks Shanghai Jiao Tong University Shanghai China Laboratoire Aim e Cotton CNRS-Universit é Paris Sud 11-ENS Cachanz Campus d'Orsay Orsay91405 France

ISBN: (纸本)9781943580064

We demonstrate broadband linear frequency sweep generation with a tuning range of 200 GHz by a combination of temperature tuning and optoelectronic feedback compensation, its application in high resolution FMCW reflectometry is successively verified. OCIS codes: (140.3518) Lasers, frequency modulated;(140.3490) Lasers, distributed-feedback Asia communications and Photonics Conference (ACP). © 2015 OSA.

关键词： Distributed feedback lasers

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ASI regulations comparison for GSO satellite communication system at Ku-band

ASI regulations comparison for GSO satellite communication s...

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International Conference on Control, Electronics, Renewable Energy and communications (ICCEREC)

作者： Yuhong Ma Jinhua Zhu Wu Luo The State Key Laboratory of Advanced Optical Communication Systems and Networks Peking University China

ISBN: (纸本)9781479989768

Very small aperture terminal (VSAT) at Ku-band is very attractive in complex terrestrial and marine environment of military or disaster scene. The small aperture antenna characteristic of VSAT leads to strong interference to adjacent satellite systems. This situation is severely aggravated as Geostationary Satellite Orbit (GSO) becomes extremely congested. Various national and international agencies have imposed regulations on VSAT adjacent satellite interference (ASI). One regulation, called ΔT /T method, is used for accessing the necessity of ASI coordination, which is sophisticated and inconvenient to carry out. Another regulation imposed limit on off-axis effective isotropic radiated power (EIRP) of terminal, and specified the maximum allowable off-axis EIRP spectral density (OESD). This paper described and analyzed the salient features of these ASI regulations. Upon demonstration of their compatible and complementary relationships, it is shown that the simpler EIRP rule can be an alternative for the more complex ΔT/T method for ultra-small terminals (USAT). In this way, it will help reduce the complexity of the coordination determining procedure.

关键词： FCC Satellites Aperture antennas Downlink Satellite antennas Interference

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Best-fit Cell Attachment for Decoupling DL/UL to Promote Traffic Offloading in HetNets

Best-fit Cell Attachment for Decoupling DL/UL to Promote Tra...

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IEEE International Conference on communications

作者： Hemin Yang Anpeng Huang Linzhen Xie mHealth Lab State Key Lab of Advanced Optical Communication Systems and Networks Peking University

ISBN: (纸本)9781467364300

Heterogeneous networks (HetNets), in which small cells are ultra-densely deployed within a macro cell, is widely regarded as a key solution to mobile traffic offloading. However, this kind of traffic offloading is confronted by two challenges. Firstly, the number of users in any small cell is really limited due to the larger power gap between macros and small cells in HetNets. In return, this phenomenon may degrade traffic offloading performance. Secondly, spectrum efficiency may be deteriorated since uplink channel states are not involved in the conventional cell attachment strategies. To address these challenges, we propose a best-fit cell attachment where downlink and uplink are decoupled and attached to cells independently. Specifically, in this paper, we conceive best-fit strategies for down-link and uplink cell attachment, for taking into account of both channel quality and cell load. And then, their implementation issues in different scenarios are discussed in detail. system-level simulation results demonstrated that our proposal can effectively offload traffic from macros to small cells, and improve data rates for cell-edge users significantly.

关键词： Heterogeneous networks (HetNets) Downlink-Uplink Decouple Traffic Offloading Best-Fit Cell Attachment

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GHz level fiber laser and frequency comb

GHz level fiber laser and frequency comb

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Pacific Rim Conference on Lasers and Electro-Optics (CLEO/Pacific Rim)

作者： Zhigang Zhang Amin Wang Chen Li Yuxuan Ma State Key Laboratory of Advanced Optical Communication System and Networks Peking University Beijing P. R. China

The advanced laser technology has led to gigahertz level repetition rate femtosecond fiber laser possible. This laser offers advantages of high average power, chirp-free output pulses and helps the frequency comb made... 详细信息

ISBN: (纸本)9781467371100

关键词： optical fiber dispersion optical fiber polarization optical fiber networks optical fiber amplifiers Cavity resonators Collimators

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Semiconductor quantum dot-doped glass as spectral converter for photovoltaic application

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Chinese Science Bulletin 2014年第1期59卷 16-22页

作者： Lu Sun Chun Jiang State Key Laboratory of Advanced Optical Communication System and Networks Shanghai Jiao Tong University

In this article,we focus on using the multiexciton generation(MEG)effect of quantum dot(QD)to realize quantum cutting of high-energy photons which will give rise to a remarkable increase of total photon *** avoid the complicated solving of Schro¨dinger equation,we take approximations and develop a method for fast evaluating the quantum efficiency of MEG *** this basis,we calculate the detailed balance limit of efficiency of Si single-junction solar cell with Si QD-doped glass placed on top of it as a spectral converter *** shows that the efficiency will reach 36%which is 6%higher than that without the converter *** have also explored the influence of QD radius,QD-doping density,QD,and host material,device working temperature on the efficiency.

关键词：半导体量子点掺杂玻璃转换器光谱应用光伏太阳能电池量子剪裁

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Unrepeatered 515Gb/s Nyquist PDM-128QAM transmission over 120km SSMF with backward Raman amplification

Unrepeatered 515Gb/s Nyquist PDM-128QAM transmission over 12...

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OptoElectronics and communications Conference, OECC

作者： Dan Wang Xin Lv Yixiao Zhu Kaiheng Zou Fan Zhang Lixin Zhu Zhangyuan Chen State Key Lab of Advanced Optical Communication Systems and Networks Peking University Beijing China

We experimentally demonstrate Nyquist superchannel transmission of 515Gb/s (8×64.4Gb/s) PDM-128QAM over single span of 120 km SSMF, using backward Raman amplification at the receiver-side. We achieve a record dis... 详细信息

关键词： optical fiber amplifiers optical transmitters optical fiber communication Stimulated emission optical amplifiers optical receivers optical filters

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Unrepeatered 447Gb/s Nyquist PDM-64QAM transmission over 160km SSMF with Backward Raman Amplification

Unrepeatered 447Gb/s Nyquist PDM-64QAM transmission over 160...

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European Conference on optical communication

作者： Xin Lv Dan Wang Yixiao Zhu Kaiheng Zou Zhennan Zheng Fan Zhang Lixin Zhu Zhangyuan Chen State Key Lab of Advanced Optical Communication Systems and Networks Peking University Beijing China

We experimentally demonstrate Nyquist superchannel transmission of 447 Gb/s (8×55.97Gb/s) PDM-64QAM over single span of 160 km SSMF with backward Raman amplification. We achieve a record distance of unrepeatered ... 详细信息

关键词： Bit error rate optical fibers optical transmitters Power measurement optical filters Stimulated emission Erbium-doped fiber amplifiers

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