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We demonstrate a compact, single-etched sub-wavelength grating coupler for the O-band application, which has a measured insertion loss of −4 dB, a 3-dB bandwidth of 39 nm, back reflections below −20 dB, and a design footprint of 20um × 40um.
We demonstrate a broadband sub-wavelength grating coupler for the O-band application, which has a simulated coupling efficiency of −3.3 dB with 3-dB bandwidth of 78 nm and a measured coupling efficiency of −4.5 dB with a 3-dB bandwidth of 65 nm for fundamental TE mode.
In cloud computing, load balancing is a very important performance factor. Frequent addition and removal of Virtual Machines (VMs) can cause load imbalance across Host Machines (HMs). Therefore, redistribution of VMs to different HMs needs to be performed periodically. This is called VM load rebalancing (VMrB). Existing VMrB solutions consider either balancing across HMs (inter-HM) or balancing within...
In cloud computing, an important issue is virtual machine placement (VMP), selecting the most suitable set of physical hosts for a set of virtual machines. In this paper, we present a novel solution to the VMP problem called VMPMBBO. Our scheme treats the VMP problem as a complex system, and utilizes the biogeography-based optimization (BBO) technique to optimize the virtual machine placement that...
An unequally spaced linear array used in retrodirective array is proposed in this paper. The synthesis is carried out using Differential Evolution with Global and Local neighborhoods (DEGL) algorithm. A 16-element array with two layer antenna element is implemented to validate the numerical results. The simulation results show that the maximum sidelobe level is basically below -20 dB in the range...
In this paper, synthesis design of a class of ultra-wideband parallel-coupled line bandpass filters with Chebyshev responses is presented. Through the exact synthesis approach with virtue to closed-form insertion loss function, characteristic impedances of each coupled and connecting line section are explicitly determined. Based on the obtained impedance values, the realizable range of filtering bandwidth...
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