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This paper investigates the radiation characteristics of on-chip microstrip patch reflectarray for 60 GHz system. The proposed reflectarray is fed using on-chip cylindrical dielectric resonator antenna, CDRA placed at a distance 42.5 mm from the array aperture. The antenna introduces good impedance matching at 61 GHz. The impedance bandwidth is 1.35 GHz. The reflectarray consists of 289 unit-cell...
We study ultrafast spectral characteristics of our ultra-short ultra-slicon rich nitride (USRN) waveguide with large Kerr nonlinearity (γ∼550W−1/m) and negligible nonlinear loss. The output spectra of USRN ring resonator and short-length waveguide broaden around 2 times and 4 times wider than that in 500 fs input pulses, respectively. Negligible nonlinear loss including two-photon absorption at near-infrared...
We propose and experimentally demonstrate a compact integrated silicon photonic comb filter based on two cascaded Sagnac-loop mirrors. By using thermal tuning with three micro-heaters, the center wavelength can be tuned over several FSRs and the 3-dB bandwidth can be tuned to 2.5 GHz.
We numerically demonstrate dispersion tailoring of a silicon strip waveguide employing Titania-Alumina thin-film coating using a finite-difference mode solver. The proposed structure exhibits spectrally-flattened near-zero anomalous dispersion within the telecom wavelength range. We also numerically predict the wavelength conversion efficiency for degenerate four-wave mixing, and obtain a 3 dB bandwidth...
Modern stream processing frameworks, such as Spark Streaming, are designed to support a wide variety of stream processing applications, such as real-time data analytics in social networks. As the volume of data to be processed increases rapidly, there is a pressing need for processing them across multiple geo-distributed datacenters. However, these frameworks are not designed to take limited and varying...
Minimum storage regenerating (MSR) codes form a special class of maximum distance separable (MDS) codes by providing mechanisms for exact regeneration of a single code block in their codewords by downloading the minimum amount of information from the remaining code blocks. As a result, the MSR codes find application to distributed storage systems to enable node repairs with the optimal repair band-width...
Network Function Virtualization has attracted attention from both academia and industry as it can help the service provider to obtain agility and flexibility in network service deployment. In general, the enterprises require their flows to pass through a specific sequence of virtual network function (VNF) that varies from service to service. In addition, for each VNF required in the coming service...
In the era of global-scale services, analytical queries are performed on datasets that span multiple data centers (DCs). Due to the scarce and expensive inter-DC bandwidth, various methods have been proposed to reduce either the traffic cost or the completion time for those analytics queries. However, current methods make no attempt to maximize the number of successfully served query requests. Moreover,...
Recent development of wireless communications has resulted to the augmentation of small cell to traditional macrocell networks. This constitutes an improved coverage and system capacity of the networks. However, it consequently results to interference and high blockage rate, which are the problems we are treating in this paper. This work proposes two cell selection schemes that adopt the enhanced...
Fair and efficient coflow scheduling improves application-level networking performance in today's datacenters. Ideally, a coflow scheduler should provide isolation guarantees on the minimum coflow progress to achieve predictable networking performance. Network operators, on the other hand, strive to decrease the average coflow completion time (CCT). Unfortunately, optimal isolation guarantees and...
This demonstration presents a practical real-time full-duplex wireless link consisting of two full-duplex transceivers. Our prototyped full-duplex transceiver contains a custom-designed RF self-interference canceller and a National Instruments (NI) Universal Software Radio Peripheral (USRP). The discrete-component-based RF self-interference canceller emulates a compact RFIC implementation, which uses...
In this paper, silicon/glass/organic interposers for 2.5D/3D interconnects are investigated for signal integrity analysis. As total system bandwidth increases, memory industry has been developed to satisfy its requirements. Therefore, High Bandwidth Memory (HBM) is introduced to the market. HBM enables TeraByte/s bandwidth with extremely fine pitch, short interconnects using Through Silicon Via (TSV)...
In this paper, we describe the performance and power benefits of our Fine Pitch integration scheme on a Silicon Interconnect Fabric (Si IF). Here we propose a Simple Universal Parallel intERface (SuperCHIPS) protocol enabled by fine pitch dielet to interconnect fabric assembly. We show the dramatic improvements in bandwidth, latency, and power are achievable through our integration scheme where small...
Simulation is a fast, controlled, and reproducible way to evaluate new algorithms for distributed computing platforms in a variety of conditions. However, the realism of simulations is rarely assessed, which critically questions the applicability of a whole range of findings. In this paper, we present our efforts to build platform models from application traces, to allow for the accurate simulation...
The terahertz waveguide directional coupler with double “tian-shape” is designed basing on the directional coupling principle of branch line. The branch lines closed to the waveguide width edge are bolding to increase stress and then the feasibility of processing will be improved. The coupler is analyzed and optimized by professional electromagnetic simulation software high-frequency structure simulator...
Network Function Virtualization (NFV) and Software-Defined Networking (SDN) technologies enable a fast way of deploying network services by instant initialization of virtual network functions on standardized commodity hardware, and a flexible network control and management via dynamic reconfigurations over open protocols. In particular, virtual networks from distinct tenants can be provisioned on...
This paper reports on the development and experimental characterization of a high data-rate communication link at 240GHz with highly-integrated direct-conversion quadrature transmitter and receiver modules implemented in 130nm SiGe HBT technology with ft/fmax of 350/550 GHz. Both modules employ a low-cost chip-on-board packaging scheme with single-chip TX and RX front-end circuits accommodating wideband...
The pattern synthesis technique described here is unique in that it allows the power pattern to be optimized in a very useful sense over the desired operating band of the array. This is an improvement over previous techniques involving constraints on such artificial parameters as source norm and superdirectivity ratio which do not in fact ensure a useful pattern bandwidth. The procedure described...
The most important element on IoT thought is communication bandwidth that is directly affected the data processing performance and communicating each other. The way for getting wider bandwidth involves three approaches which are high speed clocking, many lanes and high data compression. The first two issues relate with packaging technology[10]. The system performance balance should put together the...
Full-duplex (FD) radio communication potentially doubles the spectral efficiency in the densely occupied RF spectrum (100MHz to 5GHz). However, significant challenges remain, particularly the presence of a strong transmitter (TX) self-interference (SI) coupling to the receiver (RX). Numerous recent efforts on mitigating SI have focused on using active cancellation techniques [1–5]. However, these...
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