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The Ethernet VPN (EVPN) technology has emerged as a key solution for the interconnection of geo-distributed Data Centers (DCs) over provider-managed MPLS networks. Such interconnections need to satisfy service-level agreements, which can be achieved by enforcing Traffic Engineering (TE) policies. However, deploying an effective TE policy is challenging and complex. This stems from the fact that network...
Radio frequency photonics is demonstrating superior performance in communication systems using discrete components. As systems establish an upgrade path balancing challenging bandwidth requirements with size, weight and power constraints, the time is ripe to transition to a more efficient and cost-effective hybrid manufacturing technology.
In this paper studies an X-band ultra-wideband micro-balun based on LTCC, the working frequency of 7–13GHz, belonging to the X-band, the relative bandwidth is 60%. In this paper, from the design and manufacture of the product, combined with the theoretical basis, through the HFSS simulation software to complete the design, finally, it decided to use three coupling lines to improved Marchand Balun...
In this paper a practical application of an electrooptical communication system based on external modulation is reported. The sixteen ATSC TV-channels located at 2.4 GHz, were transmitted over a 30 km of standard optical fiber. The transmitted TV-signal uses Single-Side Band Full Carrier (SSBFC) modulation, allowing in this way an adequate management of the transmitted power and the bandwidth. The...
The Internet of Things (IoT) is an important part of the information technology of the future. Technically, IoT is expected to enable people-thing and thing-thing interconnections by combining communication technologies and networks. Our Lab has been actively promoting research on 5G & IoT, in which the NB-IoT new radio interface issue is of great interest. New 5G tests put forward a lot of requirements...
One Dimensional (1D) Double Weight (DW) code families are one of the coding schemes reported for Spectral Amplitude Coding — Optical Code Division Multiple Access systems. Modified Double Weight code and Enhanced Double Weight code are two algorithms which increase the scope of DW code for even and odd weights respectively. By using above mentioned codes, two Dimensional (2D) codes are generated....
Support vector data description (SVDD) is a popular technique for detecting anomalies. The SVDD classifier partitions the whole space into an inlier region, which consists of the region near the training data, and an outlier region, which consists of points away from the training data. The computation of the SVDD classifier requires a kernel function, and the Gaussian kernel is a common choice for...
In this paper, an Erbium-doped fiber-based, broadband super-fluorescent fiber source (SFS) is proposed and demonstrated. Using a broadband fiber Bragg grating (BFBG) with temperature compensated by attaching it upon a carbon fiber composite, it has a very low mean wavelength drift of 1.26 ppm/°C in temperature range 0 °C to 60 °C. The fluorescent fiber source structure is designed in a double-pass...
This paper evaluates the impact of the optical and electrical filtering on the performance of wavelength-division-multiplexed passive optical network (WDM-PON) transmission system with four-level pulse amplitude modulation (PAM-4) format and 40 Gbit/s (20 Gbaud/s) per-channel data rate for the optical C and L frequency bands. Paper determines the combination of the implemented electrical and optical...
Current Network Function Virtualization (NFV) with Virtualized Network Functions (VNFs) running as virtual machines on commodity servers enables flexibility to Service Function Chaining (SFC). Specific applications may require Quality of Service (QoS) on end-to-end latency. However, the processing delay and the queuing delay of VNFs varies with virtual resource configurations (vCPU and vMemory), as...
Multipath TCP (MPTCP) has gained great attention by the researchers and network application developers due to its features providing better bandwidth utilization and higher reliability recently. Utilizing MPTCP in the datacenters provides performance gain to the applications. If the underlying network has Software Defined Networking (SDN) architecture, the routing of the MPTCP subflows can be specialized...
Photonic systems are being increasingly designed for multi-functional, distributed avionic platforms to satisfy the next-generation military needs [1]. This approach requires establishing high-capacity, Free-Space Optical (FSO) communication networks that connect a variety of mobile and aerial platforms in an ad-hoc fashion [2]. Traditional design methodology, that addresses a specific scenario with...
In this paper the performance aspects of multivalued elements is examined. The paper demonstrates ways to increase the speed of multi-valued elements when the voltage jump at the inputs of the operational amplifiers and greater than the maximum voltage corresponding to the limit of linearity of the amplifier. The influence of dynamic overload conditions during the transition process has been showed.
Despite the high phase non-linearity of a Silicon Mach-Zehnder Modulator in forward bias, we demonstrate that high third order spur-free dynamic range ~102.8 dB. Hz2/3 can be obtained by optimizing the D.C. bias operating point at 1 GHz.
We have been experiencing two very important movements in computing. On the one hand, a tremendous amount of resource has been invested into innovative applications such as first-principle-based methods, deep learning and cognitive computing. On the other hand, the industry has been taking a technological path where application performance and energy efficiency vary by more than two orders of magnitude...
The intense demand for video applications from mobile devices brings a challenge to the hardware design, especially in the energy consumption. This work presents a design space exploration to define energy-efficient cache memory configurations for the ME process considering different video sequences and HEVC encoder configurations. We focus on the Motion Estimation (ME) process, known as the most...
Analog signal sampling is one of the most fundamental topics in engineering sciences. The classical Shannon theorem is proposed for the band-limited signals, and so far it has been a cornerstone in signal processing and communication theory. In this work, we present a group of local time domain theorems for sampling differentiable continuous analog signals through Lagrange interpolation, and show...
The bursty many-to-one communication pattern, typical for data acquisition systems, but also present in datacenter networks, is particularly demanding for commodity TCP/IP and Ethernet technologies. We expand our study of building incast-resistant networks based on software switches running on commercial-off-the-shelf servers. In this paper we provide the estimates for costs and physical area required...
Harvesting energy from mechanical vibrations to provide power in remote areas where there is no lines of electricity has attracted a great research interest. Linear vibration energy harvesters (VEH) are not able to scavenge energy over broadband of frequencies. The performance of the linear harvesters can be improved using the concept of nonlinearity using magnets which has been extensively studied...
In the past several decades on-chip dimensions have scaled over 2000X, while dimensions on printed circuit board have scaled 4-5X. This modest scaling of packaging dimensions has severely limited system scaling. To address this, we have proposed a disruptive package-free integration scheme. We replace the traditional organic printed circuit board (PCB) with silicon interconnect fabric (SiIF) and replace...
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