We propose a novel flexible traffic-aware OXC architecture for hybrid WDM and elastic optical network. The simulation results show that the proposed OXC can save CAPEX significantly while providing similar blocking pe...
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Most previous researches on the rate analysis of the power allocation (PA) schemes in two-way decode-and-forward (DF) relay systems typically focus on maximizing the instantaneous objective rates. However, the ergodic...
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ISBN:
(纸本)9781479980925
Most previous researches on the rate analysis of the power allocation (PA) schemes in two-way decode-and-forward (DF) relay systems typically focus on maximizing the instantaneous objective rates. However, the ergodic rate analysis of the optimized rates is not well considered. In this paper, we investigate the ergodic rates of the PA schemes in a two-way DF relay system, where the physical-layer network coding (PNC) protocol is adopted. Specifically, under a total power constraint, we consider three heuristic PA schemes, in which the optimization objectives are: 1) maximizing the sum rate;2) maximizing the sum rate with an additional rate fairness constraint;and 3) maximizing the minor rate of the two directions of the system. The cumulative distribution functions (CDFs) of the equivalent system SNR are approximately obtained and the analytical expressions for the calculations of the ergodic rates are theoretically derived. Numerical results show that the derived analytical rates are converged to the simulated results in high SNR regions.
This paper proposes a method of detecting and localizing events in optical time-domain reflectometry (OTDR). This method is based on Correlation Matching and Short Time Fourier Transform (STFT), and achieves a higher ...
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In this paper, we investigate the power allocation (PA) schemes in a two-way relay system, where the relay adopts physical layer network coding (PNC) based on decode-and-forward (DF) protocol. The objective is to dete...
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ISBN:
(纸本)9781479980895
In this paper, we investigate the power allocation (PA) schemes in a two-way relay system, where the relay adopts physical layer network coding (PNC) based on decode-and-forward (DF) protocol. The objective is to determine the optimal power allocation (OPA) scheme at both the source nodes and at the relay that minimizes the end-to-end symbol error probability (SEP) performance under a total power constraint. The perfect channel state information (CSI) is assumed to be available at both the source nodes and at the relay. Since numerical methods (e.g., exhaustive search) are required to find the solution of the OPA scheme, which might be infeasible for practical systems, based on upper and lower bounds on the optimal solution, we propose a near optimal power allocation (NOPA) scheme. The asymptotic SEP expression of the proposed NOPA scheme is also derived. By both the analytical and simulated results, it is shown that the proposed NOPA scheme provides the asymptotic SNR gains of about 1.76dB and 2.22dB over two well-known schemes in high SNR. Furthermore, simulation results show that the performance of proposed NOPA scheme is quite close to that of the OPA scheme.
We experimentally demonstrate the impact of optical filter parameters on upstream directly modulated signal chirp management in stacked wavelength-division-multiplexed orthogonal-frequency-division-multiplexed passive...
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作者：
Jian WuXuxing LuQiannan ZhuJunwei ZhaoQishun ShenLi ZhanWeihai NiDepartment of Physics and Astronomy
Key Laboratory for Laser Plasmas (Ministry of Education) State Key Lab of Advanced Optical Communication Systems and NetworksShanghai Jiao Tong University Division of i-Lab
Key Laboratory for Nano-Bio Interface Research & Collaborative Innovation Center of Suzhou Nano Science and Technology Suzhou Institute of Nano-Tech & Nano-Bionics Chinese Academy of Sciences
Through wet-chemical assembly methods, gold nanorods were placed close to each other and formed a dimer with a gap distance *1 nm, and hence degenerated plasmonic dipole modes of individual nanorods coupled together t...
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Through wet-chemical assembly methods, gold nanorods were placed close to each other and formed a dimer with a gap distance *1 nm, and hence degenerated plasmonic dipole modes of individual nanorods coupled together to produce hybridized bonding and antibonding resonance modes. Previous studies using a condenser for illumination result in averaged signals over all excitation angles. By exciting an individual dimer obliquely at different angles, we demonstrate that these two new resonance modes are highly tunable and sensitive to the angle between the excitation polarization and the dimer orientation, which follows cos2 u dependence. Moreover, for dimer structures with various structure angles, the resonance wavelengths as well as the refractive index sensitivities were found independent of the structure angle. Calculated angle-resolved plasmonic properties are in good agreement with the measurements. The assembled nanostructures investigated here are important for fundamental researches as well as potential applications when they are used as building blocks in plasmon-based optical and optoelectronic devices.
We realized an adaptive orthogonal-frequency-division-multiplexing (OFDM) visible-light-communication (VLC) system using high-order quadrature-amplitude-modulation (QAM) based on field-programmable-gate-array (FPGA). ...
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A downstream transmitter based on comb source and injection-seeding scheme is proposed for long reach DWDM-PON with 12.5-GHz channel spacing. RSOAs are used in OLT and 1.25-Gbps data is directly modulated on each chan...
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We demonstrate a series of experiments on imaging through both stationary aberrating media and moving aberrating media by computational ghost imaging(CGI).An incoherent LED light source is used instead of the common p...
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We demonstrate a series of experiments on imaging through both stationary aberrating media and moving aberrating media by computational ghost imaging(CGI).An incoherent LED light source is used instead of the common pseudothermal light source(laser light passing through a rotating ground glass).A digital micromirror device is used as a simple spatial light modulator to perform ***,a digital filtering method is introduced to improve imaging quality through moving aberrating *** imaging modality may have potential applications in medicine and astronomy.
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