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By employing optical injection-locking the direct modulation bandwidth of a 10μm diameter disc laser is increased to 15GHz. In addition, modulation at 20Gb/s is demonstrated with only 1mW DC bias & 190mV data signals (50fJ/bit).
Satellite communication has become important in the current global data communication due to its large coverage area. Satellite links are affected by two major concerns: long propagation delays, and relatively high error rates. Standard TCP congestion control variants were not designed to address these challenges. They generally depend on round trip times (RTTs), and hence suffer heavily if the RTTs...
We give proof of concept demonstrations for the use of a single InP membrane disc structure as both a directly modulated light source and photo-detector using a 27 -1 PRBS sequence at rates up to 10 Gb/s.
The paper presents the Comparison analysis of Manhattan Street Network (MSN). Improvement of performance at the destination node by applying different types of buffer at the routers is demonstrated. The results using NS2 simulator are produced. It can be concluded that the congestion and the packet drops can be reduced at the link node by appropriate selection of buffer type at the link node.
A new dynamic bandwidth allocation algorithm for the upstream channel of EPONs is proposed. In contrast to the existing competitive approaches, a standard prediction mechanism along with a judicious mix of QoS awareness and fairness in resource allocation is adopted in our approach. Via simulations we show that the proposed scheme offers an increase in overall system throughput while maintaining the...
This paper presents the design of an ultra wide band (UWB) antenna with CPW-fed. The antenna has been designed on FR4 substrate ??r = 4.3 and thickness 1.53 mm. The antenna has been fabricated and tested using VNA. The experimental results of this antenna offer ultra wide bandwidth from 2.86 GHz to 14.38 GHz. This corresponds to the impedance bandwidth 11.42 GHz and 132.48 %. The experimental results...
The present paper describes the design and development of a series fed 1 ?? 12 resonant slotted array antenna at 38 GHz. Slot dimensions, their spacing and positions have been calculated for broadside radiation pattern. Gain of 16 dBi with VSWR 1.5:1 and side lobe level better than 10 dB has been achieved. The designed antenna is a part of a planer antenna of 65 ?? 12 slotted Array. The designed antenna...
In this paper, we extend our previous work by including the decisions for connection-scheduling as part of the automated synthesis of embedded networks for networked control systems. We propose an automated approach for the synthesis of a cost-effective and correct-by-construction communication network for embedded applications subject to a set of end-to-end communication constraints of latency, bandwidth,...
We describe the design of a fifth order opamp-RC filter in a 65 nm digital CMOS process. Designed for a WLAN receiver chain, the baseband filter has a bandwidth of 9 MHz and features extensive use of digital hardware to correct for analog imperfections and thereby relaxing area and power requirements. Measurements show a 24 dB adjacent channel attenuation and an out-of-band IIP3 of 33 dBm. The complete...
In this paper we overview the different types of DDoS attacks, and their defense mechanism proposed till now, and propose a new approach. In this paper we propose a simple-to-integrate DDoS destination based defense method, which aims at mitigating an attackpsilas effect on the victim side. In this method, heavy traffic is channelizedrdquo before being forwarded to its destination node, thus preventing...
A noise product ratio (NPR) test and/or simulation is a traditional way of examining the nonlinearity of devices such as high-power amplifiers (HPAs). The advantage of NPR testing and/or simulation includes the ability to use a noise source and filters to obtain the band of noise with the appropriate notch for test purposes, which is typically more easily accomplished than performing BER testing and/or...
This paper describes the design and simulation of an Ultra Wide Band omni-directional antenna. The bandwidth of this antenna covers S, C, ext. C and X band frequencies. This bandwidth has been achieved by making a simple and easy modification in the design of a classical conical monopole (monocone) antenna. The achieved simulated results show stable radiation pattern over a specified field of view...
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