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https://www.readbyqxmd.com/read/28504727/reduced-symmetry-lma-rod-type-fiber-for-enhanced-higher-order-mode-delocalization
#1
Z Sanjabi Eznaveh, J E Antonio-Lopez, J Anderson, A Schülzgen, R Amezcua-Correa
We present a novel design of a micro-structured large-pitch, large-mode-area (LMA) asymmetric rod-type fiber. By reducing the cladding symmetry through six high-refractive index germanium-doped silica inclusions, the fiber features strong higher-order mode (HOM) delocalization, leading to a potentially enhanced preferential gain for the fundamental mode in active fibers. In addition, high resolution spatially and spectrally (S<sup>2</sup>) resolved mode analysis measurements confirm HOM contributions below 1% and LP<sub>1m</sub>-like HOM contributions below the detection limit...
May 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28488260/cessation-of-extracorporeal-photopheresis-in-chronic-lung-allograft-dysfunction-effects-on-clinical-outcome-in-adults
#2
Cécile A Robinson, Lars Huber, Christian Murer, Macé Schuurmans, Malcolm Kohler, Günther Hofbauer, Christian Benden
BACKGROUND: Extracorporeal photopheresis (ECP) has been reported to be safe and the ultimate treatment option in lung transplant recipients with chronic lung allograft dysfunction (CLAD), the main overall cause of mortality in lung transplant recipients. However, ECP is not reimbursed in selected health jurisdictions, and reimbursement by health insurance providers is a major issue. In Switzerland, ECP is not recognised by the health authorities as a therapy option for CLAD; thus by the end of 2014, ECP had to be stopped in the majority of adult lung transplant recipients cared for at the University Hospital Zurich because of lack of continuous funding...
May 10, 2017: Swiss Medical Weekly
https://www.readbyqxmd.com/read/28487540/function-of-second-cladding-layer-in-hollow-core-tube-lattice-fibers
#3
Xiaosheng Huang, Seongwoo Yoo, KenTye Yong
Modes attenuation of the tube lattice fiber (TLF) is characterized by D/λ, where D is the core diameter and λ is the wavelength. Hence, the TLF is structured with a large core to ensure a low attenuation loss. A small core, on the other hand, facilitates the gas-filled TLF applications, but at the expense of the increased mode attenuation. We show that adding a second cladding layer to the conventional one layer TLF (1TLF) can resolve the contradicting requirements. The mode attenuation of TLF with two cladding layers (2TLF) is less influenced by the D/λ value as compared to 1TLF, thus realizing a low loss small core TLF...
May 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28481819/the-effects-of-kangaroo-care-on-the-sleep-and-wake-states-of-preterm-infants
#4
Farideh Bastani, Nahid Rajai, Zahra Farsi, Heidelise Als
BACKGROUND: Developing interventions that improve deep sleep and quit awake is important to improve the quality of care that is provided to preterm infants. PURPOSE: The aim of this study was to compare the effects of kangaroo care and in-arms-holding on the sleep and wake states of preterm infants. METHODS: A randomized controlled trial design was employed in 2011-2012. Seventy-two stable preterm infants with gestational ages of 32-37 weeks and their mothers were recruited from the neonatal intensive care unit of Valiasr Hospital in Tehran, Iran...
June 2017: Journal of Nursing Research: JNR
https://www.readbyqxmd.com/read/28470870/a-multicenter-study-on-long-term-outcomes-after-lung-transplantation-comparing-donation-after-circulatory-death-and-donation-after-brain-death
#5
V van Suylen, B Luijk, R A S Hoek, E A van de Graaf, E A Verschuuren, C Van De Wauwer, J A Bekkers, R C A Meijer, W van der Bij, M E Erasmus
The implementation of donation after circulatory death category 3 (DCD3) was one of the attempts to reduce the gap between supply and demand of donor lungs. In the Netherlands, the total number of potential lung donors was greatly increased by the availability of DCD3 lungs in addition to the initial standard usage of donation after brain death (DBD) lungs. From the three lung transplant centers in the Netherlands, 130 DCD3 recipients were one-to-one nearest neighbor propensity score matched with 130 DBD recipients...
May 4, 2017: American Journal of Transplantation
https://www.readbyqxmd.com/read/28469087/models-of-lung-transplant-research-a-consensus-statement-from-the-national-heart-lung-and-blood-institute-workshop
#6
REVIEW
Vibha N Lama, John A Belperio, Jason D Christie, Souheil El-Chemaly, Michael C Fishbein, Andrew E Gelman, Wayne W Hancock, Shaf Keshavjee, Daniel Kreisel, Victor E Laubach, Mark R Looney, John F McDyer, Thalachallour Mohanakumar, Rebecca A Shilling, Angela Panoskaltsis-Mortari, David S Wilkes, Jerry P Eu, Mark R Nicolls
Lung transplantation, a cure for a number of end-stage lung diseases, continues to have the worst long-term outcomes when compared with other solid organ transplants. Preclinical modeling of the most common and serious lung transplantation complications are essential to better understand and mitigate the pathophysiological processes that lead to these complications. Various animal and in vitro models of lung transplant complications now exist and each of these models has unique strengths. However, significant issues, such as the required technical expertise as well as the robustness and clinical usefulness of these models, remain to be overcome or clarified...
May 4, 2017: JCI Insight
https://www.readbyqxmd.com/read/28468440/anisotropic-tapered-polarization-maintaining-large-mode-area-optical-fibers
#7
V E Ustimchik, J Rissanen, S M Popov, Y K Chamorovskii, S A Nikitov
We demonstrate a novel type of tapered large mode area polarization-maintaining fiber. These birefringent fibers have an elliptical inner cladding and a core diameter that increases adiabatically from 8 µm to 70 µm. The polarization maintaining ability of the fiber samples was investigated by measuring the spatial distribution of polarization beat length by using optical frequency-domain reflectometry. The measurements show a clear correlation between the birefringence and the fiber core size, resulting in a modest 10-15% variation in polarization beat length along the fiber...
May 1, 2017: Optics Express
https://www.readbyqxmd.com/read/28468412/helical-long-period-grating-manufactured-with-a-co-sub-2-sub-laser-on-multicore-fiber
#8
Shen Xiang, Hu Xiongwei, Yang Luyun, Dai Nengli, Wu Jianjun, Zhang Fangfang, Peng Jingang, Li Haiqing, Li Jinyan
We have demonstrated a helical long-period grating (HLPG) manufactured from multicore fiber (MCF) combined with twist and CO<sub>2</sub>-laser heating technology. The MCF we used behaves as a kind of single mode fiber. The nineteen cores of MCF are distributed hexagonally which make the helical structure only exist in core area after heating and twisting. There are several strong couplings between the core and cladding modes at different wavelengths when the grating pitch was 900 µm. The extinction ratio of the main coupling reached 20 dB at 1550 nm...
May 1, 2017: Optics Express
https://www.readbyqxmd.com/read/28468355/study-of-the-pedestal-process-for-reducing-sidewall-scattering-in-photonic-waveguides
#9
Emerson G Melo, Marco I Alayo, Daniel O Carvalho
In this work we investigate the principles of an alternative method for defining sidewall in optical waveguides fabricated using planar technology. The efficiency of this method is demonstrated through simulations and experimental results regarding propagation losses of a solid core ARROW waveguide fabricated on silicon substrate. It is well known that waveguides fabricated using sidewalls etched via Reactive Ion Etching (RIE) can present high sidewall roughness, especially if metallic hard-masks are used. This is largely responsible for the undesirable losses observed in these waveguides...
May 1, 2017: Optics Express
https://www.readbyqxmd.com/read/28463273/100-nm-tunable-femtosecond-cr-lisaf-laser-mode-locked-with-a-broadband-saturable-bragg-reflector
#10
Umit Demirbas, Jing Wang, Gale S Petrich, Sheila Nabanja, Jonathan R Birge, Leslie A Kolodziejski, Franz X Kärtner, James G Fujimoto
We report broad tunability of a femtosecond (fs) diode-pumped Cr:LiSAF laser mode-locked with a broadband saturable Bragg reflector (SBR). The SBR had seven pairs of Al<sub>x</sub>O<sub>y</sub>(n∼1.5) and Al<sub>0.17</sub>Ga<sub>0.83</sub>As(n∼3.5) layers in its Bragg stack, enabling a 250 nm reflectivity bandwidth around 850 nm. A 6-nm-thick strained In<sub>0.15</sub>Ga<sub>0.85</sub>As quantum well placed between Al<sub>0...
May 1, 2017: Applied Optics
https://www.readbyqxmd.com/read/28459094/dataset-on-photonic-crystal-fiber-based-chemical-sensor
#11
Kawsar Ahmed, Bikash Kumar Paul, Sawrab Chowdhury, Md Shadidul Islam, Shuvo Sen, Md Ibadul Islam, Sayed Asaduzzaman, Ali Newaz Bahar, Mohammad Badrul Alam Miah
This article represents the data set of micro porous core photonic crystal fiber based chemical sensor. The suggested structure is folded cladding porous shaped with circular air hole. Here is investigated four distinctive parameters including relative sensitivity, confinement loss, numerical aperture (NA), and effective area (Aeff). The numerical outcomes are computed over the E+S+C+L+U communication band. The useable sensed chemicals are methanol, ethanol, propanol, butanol, and pentanol whose are lies in the alcohol series (Paul et al...
June 2017: Data in Brief
https://www.readbyqxmd.com/read/28457418/histopathological-findings-associated-with-gastroesophageal-reflux-disease-and-aspiration-after-lung-transplantation-initial-brazilian-single-center-experience
#12
R M Carraro, E C T Nascimento, S Szachnowicz, P C L B Camargo, S V Campos, J E Afonso, M N Samano, P M Pêgo-Fernandes, M Dolhnikoff, R H O B Teixeiraa, A N Costa
BACKGROUND: Gastro-esophageal reflux disease (GERD) and broncho-aspiration (BA) are known to increase the risk for chronic lung allograft dysfunction (CLAD). However, specific lung injury mechanisms are not clearly known. The objective of the study was to describe histopathological findings in surveillance lung transbronchial biopsies that can be correlated with episodes of BA in the lung allograft. METHODS: This retrospective analysis of surveillance transbronchial biopsies was performed in lung transplant recipients, with available data of broncho-alveolar fluid (cultures and cytology), lung function parameters, and esophageal functional tests...
May 2017: Transplantation Proceedings
https://www.readbyqxmd.com/read/28454132/broadband-single-mode-single-polarization-passive-fully-aperiodic-large-pitch-fibers
#13
Rémi du Jeu, Romain Dauliat, Dia Darwich, Aurélien Benoit, Raphaël Jamier, Kay Schuster, Philippe Roy
Two evolutions of fully aperiodic large-pitch fiber designs employing few stress-applying parts are presented. The induced elasto-optic stress discriminates the two orthogonal polarization modes (LP<sub>01x</sub> and LP<sub>01y</sub>) of the fundamental mode, selectively delocalizing one of them into the cladding via a suitable coupling to one or several cladding modes. This ensures the propagation of a single linear polarization mode. For the largest core dimensions, however, the applied stress can strongly influence the intensity distributions of core modes, and a tailored design process must thwart this...
May 1, 2017: Optics Letters
https://www.readbyqxmd.com/read/28437968/vortex-energy-flows-generated-by-core-shell-nanospheres
#14
Shih-Wen Chen, Jia-Han Li
Investigated in this paper is the interaction of light and the nanospheres composed by a dielectric core with a gold-shell cladding that causes the optical vortices inside the core and the whirlpools around the shell. Different radius ratios, dimensions and the dielectric functions of nanospheres were studied using the finite-difference time-domain method. It was found that optical vortices were most likely to occur in the regions of increased absorption cross section and reduced scattering cross section. Two optical vortices of the opposite polarity, each centered in one of the particles of a dimer are created by a nanoshell dimer...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437953/high-power-cladding-light-stripper-using-segmented-corrosion-method-theoretical-and-experimental-studies
#15
Lu Yin, Mingjian Yan, Zhigang Han, Hailin Wang, Hua Shen, Rihong Zhu
We present the segmented corrosion method that uses hydrofluoric acid to etch the fiber of a fiber laser for removing high-power cladding light to improve stripping uniformity and power handling capability. For theoretical guidelines, we propose a simulation model of etched-fiber stripping to evaluate the relationship between the etched-fiber parameters and cladding light attenuation and to analyze the stripping uniformity achieved with segmented corrosion. A two-segment etched fiber is fabricated with cladding light attenuation of 19...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437906/temperature-insensitive-fiber-optic-fabry-perot-interferometer-based-on-special-air-cavity-for-transverse-load-and-strain-measurements
#16
Yongfeng Wu, Yundong Zhang, Jing Wu, Ping Yuan
We experimentally demonstrate transverse load and strain sensing based on a fiber optic Fabry-Perot interferometer (FPI) with special air cavity, which was created by fusion splicing single mode fiber (SMF), hollow core fiber (HCF) and several electrical arc discharges. The cavity height of this structure is higher than the cladding diameter of SMF so that it can sense transverse load with high sensitivity. The transverse load sensitivity of this air cavity FPI sensor is 1.31 nm∕N and about 5 times more sensitive compared to the current fiber tip interferometer (0...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437902/high-performance-temperature-sensing-using-a-selectively-filled-solid-core-photonic-crystal-fiber-with-a-central-air-bore
#17
J Ma, H H Yu, X Jiang, D S Jiang
A high-performance temperature sensor based on mode-coupling principle is proposed using a selectively filled, solid-core photonic crystal fiber with a central air-bore. The fibers are fabricated using the "stack-and-draw" method, with a micro scale central bore deliberately kept during the drawing procedure. The addition of the central air-bore enhances the mode-coupling efficiency between the fundamental core mode and modes in the high-index liquid-filled holes in the fiber cladding, therefore, the fiber can be used for a novel sensing architecture, when cladding holes are selectively filled with temperature sensitive liquids...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28431983/comparison-of-extracorporeal-photopheresis-and-alemtuzumab-for-the-treatment-of-chronic-lung-allograft-dysfunction
#18
Anna Moniodis, Keri Townsend, Alexander Rabin, Obadah Aloum, Jessica Stempel, Patrick Burkett, Phillip Camp, Miguel Divo, Souheil El-Chemaly, Hari Mallidi, Ivan Rosas, Anne Fuhlbrigge, Sophia Koo, Hilary J Goldberg
BACKGROUND: Survival after lung transplantation is limited by chronic lung allograft dysfunction (CLAD). Immunomodulatory therapies such as extracorporeal photopheresis (ECP) and alemtuzumab (AL) have been described for refractory CLAD, but comparative outcomes are not well defined. METHODS: We retrospectively reviewed spirometric values and clinical outcomes after therapy with ECP, AL, or no treatment (NT) in patients with CLAD who underwent transplant between January 2005 and December 2014...
March 24, 2017: Journal of Heart and Lung Transplantation
https://www.readbyqxmd.com/read/28430245/operation-of-ho-yag-ultrafast-laser-inscribed-waveguide-lasers
#19
Sean McDaniel, Fiona Thorburn, Adam Lancaster, Ronald Stites, Gary Cook, Ajoy Kar
We report fabrication and operation of multi-watt level waveguide lasers utilizing holmium-doped yttrium aluminum garnet (Ho:YAG). The waveguides were fabricated using ultrafast laser inscription, which relies on a chirped pulse ytterbium fiber laser to create depressed cladding structures inside the material. A variety of waveguides were created inside the Ho:YAG samples. We demonstrate output powers of ∼2  W from both a single-mode 50 μm waveguide laser and a multimode 80 μm waveguide laser. In addition, laser action from a co-doped Yb:Ho:YAG sample under in-band pumping conditions was demonstrated...
April 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/28430221/numerical-simulation-on-the-performance-analysis-of-a-graphene-coated-optical-fiber-plasmonic-sensor-at-anti-crossing
#20
Jeeban Kumar Nayak, Rajan Jha
A graphene-based surface plasmon resonance sensor using D-shaped fiber in anti-crossing has been designed. Silver as a plasmon active metal is followed by graphene, which helps in preventing oxidation and shows better adsorption efficiency to biomolecules. A wavelength interrogation technique based on the finite element method has been used to evaluate performance parameters. Design parameters such as thickness of silver, residual cladding, and GeO<sub>2</sub> dopant concentration have been optimized...
April 20, 2017: Applied Optics
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