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We analyze the availability of virtual optical networks mapped over a physical substrate and propose VON mapping algorithms with selective dedicated protection to minimize cost while meeting availability requirements.
In this paper, we study the reliable virtual network mapping (RVNM) problem for allocating virtual machines (VMs) from multiple data centers (DCs) with the objective of maximizing the total reliability of a virtual network under two capacity constraints: computing capacity constraint at each DC and bandwidth capacity constraint on each link. We first describe graph models of RVNM, formulate the RVNM...
Based on substrate integrated waveguide (SIW) technology and the standard single layer printed circuit board (PCB) process, a slot antenna array with three beams at X-band is designed and realized. A slot antenna unit based on SIW technology is analyzed and designed at 10GHz. S parameters and radiation patterns are given. Finally, a 3×1 antenna array is connected with the Butler matrix as a beam-forming...
A high-speed data transmission system using half mode substrate integrated waveguide (HMSIW) is proposed in this paper. The HMSIW transmits the signal by TE0.5,0 mode so the channel bandwidth is from the cutoff frequency of TE0.5,0 mode to the cutoff frequency of TE1.5,0 mode. In contrast, the traditional SIW transmits the signal by TE10 mode and the channel bandwidth is from the cutoff frequency...
Substrate integrated waveguide (SIW) is regarded as an available interconnects solution for high-speed data transmission. In this paper, in order to further improve the data rate and bandwidth usage, an SIW interconnect system based on Quadrature Phase Shift Keying (QPSK) modulation and demodulation technique is proposed. The associated theoretical models validate the feasibility of the presented...
We jointly consider problems of virtual network mapping and routing and wavelength assignment in WDM networks. Flexible virtual node mapping enabled by network virtualization achieves significant optical network resource savings compared to fixed node mapping.
The influence of back-gate bias on DC and RF characteristics in C-doped SiGe HBTs (SiGe:C HBTs) on thin-film silicon-on-insulator (SOI) was investigated. The experimental result indicates that a positive substrate bias is very effective in RC and hysteresis reduction, and further improves the maximum fT from 16 to 53GHz. Analytical relationships are developed to quantify the impact of substrate bias...
We review hybrid silicon microring lasers built on silicon-on-insulator substrate and their thermal performance bottleneck. A low-loss silicon-on-diamond (SOD) substrate as the thermal solution and hybrid microring devices on SOD are discussed.
InAlGaN quaternary alloys were grown on nitrided sapphire, AlN nuclear layer and GaN layer by radio-frequency plasma-excited molecular beam epitaxy (RF-MBE). Reflection high-energy electron diffraction (RHEED), Rutherford back-scatter spectrometry (RBS), atomic-force microscopy (AFM) and high resolution X-ray diffraction (HRXRD) were used to characterize the InAlGaN alloys. Different buffer layers...
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