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Quantum-behaved particle swarm optimization (QPSO) is a novel variant of particle swarm optimization (PSO), inspired by quantum mechanics. Compared with traditional PSO, the QPSO algorithm guarantees global convergence and has less number of controlling parameters. However, QPSO is likely to get trapped into a local optimum because of using a single search strategy. This paper proposes a cooperative...
We demonstrate a back end of line compatible SiN based material with tunable refractive index enabling low optical loss, high non-linear Kerr response, low index photonic crystals, high efficiency couplers, low loss waveguides and temperature tolerant MUX for DWDM.
We demonstrated femtosecond laser inscription of fiber Bragg gratings (FBGs) in a twin-core few-mode fiber (TC-FMF) for directional bend sensing. An FBG was selectively inscribed in one core of the TC-FMF by using an 800 nm femtosecond laser through a phase mask. Three resonance peaks at the wavelengths of 1549.05, 1547.65, and 1546.08 nm were observed in the reflection spectrum of the TC-FM FBG,...
We demonstrate a novel polyvinyl chloride (PVC) diaphragm-based fiber-tip Fabry-Perot interferometer for gas pressure measurements with ultra-high sensitivity. The PVC diaphragm has been coated to the end facet of a well-cut standard single-mode fiber by use of a plastic welder. Ultrahigh pressure sensitivity of ∼66.07 nm/MPa at 1565 nm and a low temperature cross-sensitivity of —5.5 KPa/°C have been...
An echelle diffraction grating (de)multiplexer with arc-shaped grating teeth, based on a multi-guide vertical integration platform in InP is presented. The device can be applied to the 100GBASE-LR4 Ethernet systems, the crosstalk is better than −19 dB. By adjusting grating facets, the 3-dB spectral bandwidth is increased to 2.2 nm compared with 1.7 nm in a conventional design with a loss penalty less...
A 1310 nm InGaAlAs/InP V-cavity laser (VCL) is proposed and experimentally demonstrated. The laser is ultra-compact with a device size of only 520μm×300μm. Measurement result shows that 38×100GHz tuning range with above 30dB side-mode suppression ratio (SMSR) is achieved.
Optical waveguide sensing has developed rapidly in recent years. In this paper, we review our previous work about the high-sensitivity optical waveguide sensors based on Vernier effect. Experimental results show these optical waveguide sensors have the great potential applications in biological research and environment monitoring.
Comparing with uncoated LPFGs, ZnO coated LPFG shows obvious improvement of RI sensitivity between the RI range of 1.4 and 1.62. The proposed structure exhibits a very high sensitivity of 5175 nm/RIU in the RI range from 1.444 to 1.448, and the sensitivity could be further improved by optimizing the thickness of the ZnO thin film.
Currently, equipment health condition assessment concentrates on the inherent health evaluated by monitoring of the data acquired by sensors, without consideration of the evolution of non-technical factors, and thus it is not comprehensive for representing the health condition of the machine In this paper, the factors of equipment health conditions are analyzed, and the concepts of “inherent health”...
A selectively infiltrated photonic crystal fiber integrated with an embedded directional coupler and a multi-mode interferometer is fabricated by infiltrating three adjacent air holes of the innermost layer with standard 1.48 refractive index liquids. The light propagated between the fiber core and the rods can efficiently be coupled into the satellite waveguides under the phase-matching conditions...
We demonstrated a high-robustness Fabry-Perot interferometer strain sensor based on an in-fiber elliptical bubble that was created by splicing together two sections of standard single mode fibers. Such a FPI could be used to develop a high-robustness strain sensor with a low cross-sensitivity between temperature and tensile stain. The sensitivity of this strain sensor was ∼2.4 pm/με, and exhibited...
The increasing demand for higher data rates and small form factor equipment for optical networks is fuelling research on integrated optical devices with small footprint and broad bandwidth. Here, we present novel design approaches for grating couplers in the silicon and silicon nitride platforms that enable broadband operation and highly efficient coupling. Furthermore, we report experimental findings...
How does a search engine company decide which advertisements to display for each query to maximize its revenue? This turns out to be a generalization of the online bipartite matching problem. In this paper, search engines decide the strategy to allocate resources with an advertiser credibility factor under budget constraints. Based on the optimal algorithm, which is the notion of a trade-off revealing...
This paper presents our work in the FG 2017 Facial Expression Recognition and Analysis challenge (FERA 2017) and we participate in the AU occurrence sub-challenge. Our work of AU occurrence recognition is based on deep learning, and we design convolution neural network (CNN) models for two types of work: facial view recognition and AU occurrence recognition. For facial view recognition, our model...
Negative-index fiber Bragg gratings (FBGs) were fabricated using 800 nm femtosecond laser overexposure and thermal regeneration. A positive-index type I-IR FBG was first inscribed in H2-free fiber with a uniform phase mask, and then a highly polarization dependent phase-shifted FBG (PSFBG) was created from the type I-IR FBG by overexposure. Subsequently, the PSFBG was annealed at 800 °C for 12 hours...
As IC technology advances to 16/14 nm and beyond, FinFET architecture with advantage of excellent leakage performance becomes main stream in IC industry. However, it also brings big challenges for integration and processes due to its very aggressive structure and profile, CD shrinkage, shadow effect and gap-fill difficulty. In this work, atomic layer deposition (ALD) metal films, including TaN, TiN...
This paper presents a universal self-aligned in situ on-chip micro tensile fracture strength tester designed for tensile strength extraction and process evaluation, which will provide, for the first time as far as the authors know, great force(above 100mN) to in situ on-chip specimen without the introduction of precise instrument, especially suitable for bulk micromachining related tests. The whole...
In this paper we propose a two-stage algorithm for robust K-subspaces recovery. In the first stage, a large number of local candidate subspaces are generated by probabilistic farthest insertion, and then the initial near-optimal K-subspaces are solved by combinatorial selection with randomized greedy method. In the second stage, the K-subspaces are further refined by assigning each data vector to...
Sign language recognition(SLR) is a challenging task due to the diversity of the signs. To tackle the problem, this paper utilize both trajectory features and hand shape features. Since the trajectory features and hand shape features are not in the same domain, it is unreasonable to concatenate them naively or model them with a unified model. To deal with the issue, we adopt Support Vector Machine(SVM)...
Weighted prediction (WP) is an efficient tool for encoding of video with brightness variations, if WP parameters can be estimated accurately. In this paper, an improved estimation method for WP parameters of advanced video coding system (AVS) is proposed. To find a best matching block in reference for current block to be encoded, a motion search scheme is presented. Each block in a searching window...
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