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Advances in SONET/SDH technologies have introduced novel features for improved services mapping and provisioning, enabling many new avenues for new Carrier Ethernet support. However Ethernet-over-SONET studies have mostly focused on provisioning point-to-point Ethernet private line offerings. This paper considers the more challenging case of provisioning multi-point-to-multi-point Ethernet LAN services...
This paper presents design and modeling techniques of integrated passive devices (IPDs) that can be stacked with RF chips in a highly integrated and miniaturized 3D system-in-package (SiP) for wireless applications. The research starts to study winding and modeling techniques for high efficiency planar transformers. Based upon the proposed and modeled planar transformers, the research explores novel...
This article looks at extended multipoint-to-multipoint Ethernet over SONET/SDH (EoS) service offerings. A novel scheme is presented based upon a tiered protection approach and results from a sample performance evaluation study are also presented.
In this paper, the proposed LC resonator-based bandpass filter embedded in a two-layer substrate is presented to achieve both miniaturization and transmission-zero creation for 3.5 GHz WiMAX applications. There are two extra transmission zeros generated near the passband for a 2nd order design without introducing either a cross-coupling mechanism between adjacent resonators or a source-load coupling...
Truxene-oligofluorene nanostructured blends have been controllably patterned with feature size to below 6 mum using inkjet printing and laser direct-writing. Our blending approach provides an attractive method of handling fluorescent macromolecules for optoelectronic applications.
GPS is especially suitable for use of location systems in wide open areas, but the availability of GPS is limited in highly built-up areas and mountain areas due to the nature of satellite communications. To extend the apparent coverage of the GPS system from a pedestrian's perspective in the mountain areas, the dead reckoning system is generally used during the transit of pedestrians through the...
Analyzing interference problems in vehicle wiring harnesses requires fast and accurate methods of approximating crosstalk. Worst-case approximations using lumped element models are fast and easy to use, but run the risk of overestimating problems. Statistical methods that account for the random variation of wire position help prevent overdesign, but are often difficult and time-consuming to apply...
This investigation experimentally demonstrates tunable slow light in a quantum well vertical-cavity surface-emitting laser at 40 GHz. Tunable optical delays are achieved by adjusting the bias current and wavelength detuning.
We construct a frequency stabilized extended-cavity diode laser (ECDL) at 822.5 nm wavelength that could be a reliable frequency reference. The laser frequency is locked to the Cs 6S1/2rarr8S1/2 two-photon-transition (TPT) with the Allan deviation of 4.4times10-13 (60 s). The possible systematic error is evaluated as 2 kHz.
This investigation experimentally demonstrates tunable slow light in a quantum well vertical-cavity surface-emitting laser at 40 GHz. Tunable optical delays are achieved by adjusting the bias current and wavelength detuning.
In this paper, we investigate the effective use of the notebook lid area for passive heat dissipation. We address the hinge design challenges associated with this and propose different spreader options for increasing the overall effectiveness of this solution. For transferring the heat to the lid, we have designed and developed a novel thermo-mechanical hybrid hinge that can provide the required torque...
Threshold channel quality index (CQI) feedback helps to achieve a high throughput at a low cost of overhead in multi-carrier systems that have saturated downlink traffic. However, when system is not saturated, the performance will degrade tremendously. In this work we build mathematical model to analyze the phenomenon. We then design traffic-aware threshold CQI feedback schemes to improve feedback...
The sea ice in polar region has been shrunk and thinned considerably with the rampant global temperature during the last few decades. It has already shown dramatic effects on regional water balance, ocean circulation and global climate. Nowadays, an extensive investigation and understanding of the environmental change in polar region becomes a crucial task. However, difficulties resulting from transportation,...
Optically-pumped, single-mode stimulated emission was observed on GaN triangular submicron-cavity bounded by {10-10} facets. FDTD analysis indicates a high-Q factor (103) resultant from material's dispersion effect near the bandedge.
Novel type of optical activity due to magnetic plasmon resonances is demonstrated for a first time. A linearly polarized light is shown to change polarization after passing through a metamaterial made of coupled magnetic dimers.
We present Alamouti code assisted V-BLAST (ACAV), a new space-time architecture for fading multiple- input multiple-output (MIMO) channels. The transmission design is simple and flexible: two antennas are used to transmit signals the same as Alamouti code, while the other antennas are used to transmit signals similar to the popular V-BLAST. For maximum-likelihood decoding, the analysis shows that...
Graded and segmented thermoelements have been considered for long, aiming at improving the performance of thermogenerators which are exposed to a large temperature difference. A precise numerical algorithm for performance estimation of thermogenerator (TEG) and Peltier cooler elements has been developed using MATHEMATICA. It is capable to calculate accurate profiles of temperature, potential, and...
We performed temperature dependent X-ray magnetic circular dichroism (XMCD) measurements at transition metal L2,3-edges. Our results indicate that the interface is a key factor in influencing the superlattices of magnetic moments and observed that the magnetic behavior is different for Fe3O4 and Mn3O4. The Curie temperature (Tc) of Mn3O4 thin film is enhanced at 15K and similar behavior was observed...
This work reports the formation of temporal solitons from incoherent waves with an instantaneous nonlinearity. One excites a large-amplitude incoherent spin wave packet in a magnetic film. If the coherence time Tc of the incoherent spin waves is longer than the nonlinear response time Tn but shorter than the wave packet duration T, one gets randomly appearing and short-lived spin wave solitons. In...
A magnetic circuit model is developed for surface-mounted permanent magnet synchronous motors and simple analytical expressions of the average flux densities within the air gap and the parameters, such as open circuit EMF is derived. To verify the accuracy of the proposed model, 2D finite element analysis (FEA) is conducted for the model motor.
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