The tremendous demand on low cost optoelectronic systems that may be used for high-density data communications, real time sensing/detection and high-speed control/actuation has heated up the research and development i...
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The tremendous demand on low cost optoelectronic systems that may be used for high-density data communications, real time sensing/detection and high-speed control/actuation has heated up the research and development in silicon photonics, which studies the principles and technologies of merging electronics and photonics into the silicon platform. To make a silicon photonic system reality, the compatibility in device size and integration processing between the photonics and electronics is essential. Over the past years, unprecedented advancement on individual silicon photonic devices, such as waveguide, beam splitter, light source, modulator, and detector, have been reoorted, vet the Droaress in size and Drocessina issues are still under develoDment.
In this paper, we introduce an adaptive modulation and coding protocol for all-participate amplify-and-forward relay network systems to achieve a better overall system performance. In the proposed scheme, all the rela...
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A novel type of plasmonic waveguide consists of periodic metallic gratings sandwiched at the core-cladding interfaces is proposed. Long propagation distances over hundreds of micrometer, subwavelength mode width and h...
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In the scientific community, Inter-Vehicle communication (IVC) protocols are frequently evaluated using simulation techniques, often using variants of WiFi stacks instead of IEEE 802.11p, which constitutes the basis f...
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In the scientific community, Inter-Vehicle communication (IVC) protocols are frequently evaluated using simulation techniques, often using variants of WiFi stacks instead of IEEE 802.11p, which constitutes the basis for the new DSRC/WAVE standard. We discuss the necessity of using accurate WAVE models based on an extensive set of simulation experiments using: an IEEE 802.11b model, an IEEE 802.11b model tweaked to work in the same frequency range and using similar timings like IEEE 802.11p, as well as a fully featured channel hopping WAVE model. Even though, intuitively, the use of the different protocols will lead to a different network behavior, to the best of our knowledge, there has been no qualitative and quantitative evaluation or comparison of both worlds. According to our results, we can conclude that the simple WiFi model may indeed be used, but only for extremely sparse scenarios - this is exactly what has been validated using field tests. In denser traffic scenarios there is a significant deviation of the protocol behavior between WiFi (and its adapted variant) compared to WAVE. Thus, especially in dense scenarios, the application behavior is strongly influenced if simulated with the wrong model - leading to unrealistic results.
Vehicular ad hoc networks (VANETs) have recently received considerable attentions for both safety and commercial applications. In this paper, we address popular content distribution (PCD) in VANETs, in which a popular...
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Optical burst switching is a promising all-optical switching technology for the next generation optical networks and signaling is one of the key components of it. According to propagation direction of control packets,...
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作者：
Li, JunhuiYu, QuanfuLiu, YuGuo, HongCREAM Group
State Key Lab. of Advanced Optical Communication Systems and Networks Inst. of Quantum Electronics School of Electronics Engineering and Computer Science Peking University Beijing 100871 China
Violation of Bell inequality cannot guarantee non-locality, thus an applicable hacking scheme on device-independent Bell test based quantum randomness expansion is given, together with a more secure upper bound on gen...
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This study uses a dipole embedded in A1203 layer to excite a symmetric surface plasmon polariton （SPP） mode in Au/A1203/Au waveguide to investigate its profile properties by using finite-difference time-domain （FDT...
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This study uses a dipole embedded in A1203 layer to excite a symmetric surface plasmon polariton （SPP） mode in Au/A1203/Au waveguide to investigate its profile properties by using finite-difference time-domain （FDTD） method. The excited dipole decay radiatively direct near-field coupling to SPP mode owing to thin A1203 layer of 100 nm. The effects of electric and magnetic field intensity profiles and decay length have been considered and characterized. It is found that dipole location is an important factor to influence the horizontal and vertical profile properties of symmetric SPP mode in Au/A1203/Au waveguide. The amplitudes of electric and magnetic field intensity and the wavelengths of metal-insulatormetal （MIM） SPP resonance mode can be tuned by varying dipole location. The horizontal and vertical decay lengths are 19 and 24 nm, respectively. It is expected that the Au/A1203/Au waveguide structure is very useful for the practical applications of designing a SPP source.
In this paper, we consider a multiuser multi-antenna two-way relay system in which multiple pairs of partners communicate via a single relay node. The total transmit power of the relay node is shared by all pairs of p...
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