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We demonstrate the importance of considering physical impairments in waveband-based optical networks. We propose and evaluate an Impairment-Aware waveband-routing and waveband-assignment (IA-RWBA) algorithm achieving significant improvement in both impairment satisfaction rate and total network cost.
We propose an advanced RSA algorithm that employs iterative path relocation for shared protected elastic optical path networks. It enhances backup path sharing and reduces spectrum fragmentation. Numerical experiments verify that the proposed method can substantially reduce the total number of fibers and frequency slots needed.
The Multi-Pixel Photon Counter (MPPC) is a solid state photon counting device using Geiger mode APDs with self-quenching resistors. Recent advancements have been low dark current, good breakdown voltage uniformity and higher sensitivity in UV region. A 3×3mm – 4×4ch. monolithic array with silicon through vias has been developed for TOF-PET in order to decrease packaging dead space. We have also studied...
This report demonstrates a grating apodization method along the thickness direction in a real-time holographic medium for maximizing the diffraction efficiency. Dynamic photo-induced index modulation is examined by the finite-difference beam-propagation method.
This paper reports a simple method to create silicon nano tips in post self-assembled monolayer (SAM)-based anisotropic wet etching. To demonstrate the fabrication feasibility, different local etch rates at stressed surfaces at hemispherical silicon specimens in surfactant-added etchants compared to those on flat silicon surfaces have been measured, which are explained as the enhanced adsorption of...
A new genetic algorithm (GA) based Kinetic Monte Carlo (KMC) method is developed for atomistic simulations of the evolution of complex multivalued surfaces appearing during anisotropic etching of crystalline silicon. In previous KMC studies the atom-specific rates are calibrated by matching the surface morphologies but the orientation-dependence of the etch rate is described correctly in few etching...
NiPt-silicide formation using advanced annealing such as laser annealing (LA) or microwave annealing (MWA) is applied for gate-first metal gate/high-k CMOS. It is found that LA enhances NMOS drive current due to the reduction of parasitic resistance. It is found that LA produces characteristic Pt-distribution and reduces interfacial resistance between NiPtSi and Si especially for NMOS. On the other...
The purposes of this study were to obtain geographical and geological information before the dyke of the Isahaya Land Reclamation Project is opened, and to evaluate the natural recovery in the excavated area in Isahaya Bay. The presence of no new sediment within the ditches suggests that the natural return to the original geography is difficult after being artificially modified. However, the presence...
We have proposed a vision-based cutaneous sensor for telexistence that can simulate the physical interaction between a human fingertip and an object. The proposed sensor comprises a finger-shaped GelForce and a thermo-sensitive paint. The finger-shaped GelForce enables us to measure tactile information in terms of the distribution of forces that are calculated from the displacements of markers inside...
This paper reports the comparison among the results obtained by various types of testing for evaluating fatigue lifetime of silicon specimens, performed in 6 institutions in Japan. The experiment covers a variety of single crystal silicon (SCS) specimens fabricated on the same SOI wafers with 5 μm device layer thickness as well as additional specimens made separately in some institutions. In summary,...
We use the surfactant-modified wet anisotropic etching, a promising micromachining technique we have recently focused on, to fabricate sharp silicon tips with high aspect ratio without additional sharpening by thermal oxidation. Because of the intriguing variation of etching characteristics in surfactant-added solutions as compared to traditional etchants, tips possessing a front angle of about 18°...
A measurement system was newly developed to evaluate the mechanical properties of micro-sized materials at very low temperature ranging from -130°C to room temperature, using liquid nitrogen cooling. In this work, we conducted the fracture toughness tests of single crystal silicon films with thicknesses of about 1 μm at low temperature and found the temperature dependence on the fracture toughness,...
We developed a micro-TAS system that uses magnetic wires instead of the conventional beads as the carrier to improve reaction efficiency. Magnetic wire 2.0 mm×74 μm×20 μm was fabricated by wet etching. The wires were introduced into a droplet immersed in silicone oil, and they were manipulated by the magnetic force of a moving magnet. The wires were successfully bundled for transportation through...
A flexible and compact hierarchical optical cross-connect (HOXC) node that considers a practical waveband add/drop restriction is proposed. We introduce a prototype HOXC system and verify its technical feasibility and transmission characteristics.
We propose a dynamic routing and frequency slot assignment algorithm for SLICE networks that employ distance adaptive modulation. We verify that the spectrum utilization penalty that stems from non-uniform bandwidth allocation is marginal.
Compact and practical 4-degree optical cross-connect equipment with add/drop ports is realized for use in connecting ROADM ring networks. Eight 40-channel AWGs and forty 4×4 matrix switches are integrated in a 2-U high chassis.
There are various kinds of wireless network devices, such as cellular phone and wireless sensors, around us in a ubiquitous environment. Unlike a wired network, we cannot grasp the exact status of a wireless network in real space. Moreover, it is difficult to understand the relationships of connectivity intuitively, since network management software is used in a virtual two-dimensional space. We propose...
We develop network design algorithms that consider constraints on the number of added/dropped optical paths at nodes in terms of wavelength and of fiber. The strategy is demonstrated to significantly reduce node hardware scale.
InP MZ modulator of sub 1-Vpp driving voltage with quasi-traveling-wave electrode structure and Logic IC of 90-nm CMOS process as its driver were developed. Their applicability was demonstrated through 10-Gb/s - 80-km transmission over full C-band.
Hierarchical optical cross-connect architectures based on dedicated add/drop switches for terminating traffic is proposed. The architecture can significantly reduce switch scale for implementing colorless/directionless/contentionless capabilities.
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