Low-loss single-mode hybrid-lattice hollow-core photonic crystal fiber
(Press-News.org) Recent spotlights on IC-HCPCFs are due to the recently demonstrated outstanding ultralow-loss performances and their application capabilities. Nevertheless, while their attenuation achieves impressive figures, the challenge of accomplishing a low loss, single-mode (SM), and polarization-maintaining HCPCF perseveres.
In a new paper published in Light: Science & Applications, a team of scientists, led by Professor Fetah Benabid from the University of Limoges, France, and in collaboration of the University of Modena, Italy and the company GLOphotonics, proposed and fabricated a new IC-HCPCF, the hybrid Kagome-tubular lattice (HKT) HCPCF, which combines effective single-mode operation and ultralow loss. The cladding of the HKT HCPCF exhibits an inner cladding made of six untouching tubes and a Kagome outer cladding, which are linked by thin connecting tubes. The inner cladding guarantees an effective single-mode operation by providing coupling between the LP11-like modes guided in the core (usually the foremost contaminating higher-order modes to the fiber modal content) to the fundamental mode of the cladding tubes. In turn, the Kagome outer cladding significantly reduces the confinement loss.
"We endeavored to fabricate such a fiber and experimentally achieved a minimum transmission loss of 1.6 dB/km at 1050 nm. Moreover, we assessed the fiber modal content and attained a record high-order modes extinction ratio of 47 dB in a 10 m-long fiber," the researchers explain.
"The fiber single-mode operation is remarkably robust. We tested the fiber under motion and inspected the fiber modal content while misaligning the input coupling beam. We observed higher-order modes extinction ratios as high as 24.7 dB even when the coupling beam was severely misaligned (input beam shifted by 10 μm from its optimum position)."
Additionally, Prof. Benabid forecasts that "further improvements on the experimental fiber structure, such as having better control on the shapes and sizes of the connecting tubes between the tubular and Kagome lattices, are expected to entail loss reduction by more than one order of magnitude."
"In the manuscript, we delved into the fiber design rationale and extensively studied the effect of associating two IC claddings in the new HKT HCPCF. Indeed, the IC principles apprise the main design elements which allow attaining ultralow loss and tailoring the fiber properties for specific applications. Additionally, they inform the great freedom in designing HCPCFs and make us confident that, by judicious choice of the cladding structure and by ingenious fabrication methods, this fiber will be elected as protagonist of the next transformative developments in HCPCF technology", says Prof. Benabid.
[Attachments] See images for this press release:
ELSE PRESS RELEASES FROM THIS DATE:
CORVALLIS, Ore. - Dogs synchronize their behavior with the children in their family, but not as much as they do with adults, a new study from Oregon State University researchers found.
The findings are important because there is a growing body of evidence that dogs can help children in many ways, including with social development, increasing physical activity, managing anxiety or as a source of attachment in the face of changing family structures, the researchers said. Yet, very little research has focused on how dogs perceive and socially engage with children.
"The great news is that ...
In the course of a new and groundbreaking study, led by Dr, Natalia Freund and the doctoral candidate Avia Waston at the Sackler Medical Faculty, the research group succeeded in isolating monoclonal antibodies, which hindered the growth of tuberculosis germs in laboratory mice. The antibodies were isolated from a patient who had succumbed to active tuberculosis disease but had since recovered. This is, in fact, the first time in history that researchers have managed to develop a "biological antibiotic" and demonstrate that human monoclonal antibodies can act as a substitute for the traditional chemical antibiotics and protect mice from pathogenic bacterial challenge. The study was carried out in a collaboration with two additional laboratories from the US ...
At the heart of most electronics today are rechargeable lithium-ion batteries (LIBs). But their energy storage capacities are not enough for large-scale energy storage systems (ESSs). Lithium-sulfur batteries (LSBs) could be useful in such a scenario due to their higher theoretical energy storage capacity. They could even replace LIBs in other applications like drones, given their light weight and lower cost.
But the same mechanism that is giving them all this power is keeping them becoming a widespread practical reality. Unlike LIBs, the reaction pathway in LSBs leads to an accumulation of solid lithium sulfide (Li2S6) and liquid lithium polysulfide (LiPS), causing a loss of active material from the sulfur cathode (positively charged electrode) and corrosion of the lithium ...
In civil engineering, flexural beams are used to control the effect of vibrations that can cause cracks to appear in surfaces (concrete slabs) and beams. This is particularly important in buildings that require high tensile strength and where the use of machinery can cause a lot of vibrations that can disturb structural integrity. One metric to determine the reliability of beams is the deflection value, which should be appropriately low relative to the structure the beams are used in. Engineering codes such as ACI codes include provisions for such values and there are a number of methods to calculate them. Deflection is altered practically by reinforcing the construction materials with concrete or steel.
In this review, engineers ...
Biological systems can harness their living cells for growth and regeneration, but engineering systems cannot. Until now.
Qiming Wang and researchers at the USC Viterbi School of Engineering are harnessing living bacteria to create engineering materials that are strong, tolerant, and resilient. The research is published in Advanced Materials.
"The materials we are making are living and self-growing," said Wang, the Stephen Schrank Early Career Chair in Civil and Environmental Engineering and assistant professor of civil and environmental engineering in the ...
An international collaboration among researchers from Finland, Sweden, UK and the USA has captured ribosomes translating messenger RNA expressed from the maternally inherited mitochondrial genome. Utilising the latest advances in cryo-electron microscopy, the group discovered a novel mechanism that mitochondrial ribosomes use for the synthesis and delivery of newly made proteins to prevent premature misfolding. Disruptions to protein folding can lead to devastating human diseases.
There is a familiar saying, "It's all in the genes". As modern archaeology reveals, the DNA that encodes genes can be found among the remnants of our ancestors and from any organism, small and large, that once roamed the earth. The genetic blueprint alone is ...
According to a research conducted by JCDR, at least 9 out of 10 adults suffer from low health literacy in India. Health literacy is a vital aspect of any nation's growth - be it developed, underdeveloped or a developing nation. A team of researchers lead by Ruban Nersisson, at the School of Electrical Engineering, Vellore Institute of Technology, Vellore, India, have written a review on Tinnitus, a disorder of the ear characterized by a ringing sound in one or both of the ears. "We intend to spread awareness of a common hearing disorder which ironically is not commonly known to people.", says Nersisson.
'Tinnitus', is a hearing disorder that has been affecting around 7-8% of the human population since ...
They have improved a process for vertically depositing a solution made from an inexpensive perovskite solute onto a moving substrate below. Not only have they discovered the crucial role played by one of the solvents used, but they have also taken a closer look at the aging and storage properties of the solution.
Solar cells made of crystalline silicon still account for the lion's share of roof installations and solar farms. But other technologies have long since become established as well - such as those that convert sunlight into electrical energy through use of extremely thin layers of solar-cell material deposited upon a substrate. The perovskite solar cells that Prof. Eva Unger and her team at the Helmholtz-Zentrum ...
The regulation of satiety is an important factor that determines a higher or lower intake of energy and, therefore, has a considerable impact on the development and/or progression of obesity. The team made up of the researchers Lucia Camacho Barcia, Jesús García-Gavilán, Christopher Papandreou, and Mònica Bulló that leads the research group in Nutrition and Metabolic Diseases of the Department of Biochemistry and Biotechnology (Universitat Rovira i Virgili - Tarragona-Spain) have worked with researchers from Denmark ...
Long-term sleep deprivation is detrimental to health, increasing the risk of psychiatric and somatic disorders, such as depression and cardiovascular diseases. And yet, little is known about the molecular biological mechanisms set in motion by sleep deprivation which underlie related adverse health effects.
In a recently published study, the University of Helsinki, the Finnish Institute for Health and Welfare, the Finnish Institute of Occupational Health and the Finnair airline investigated dynamic changes to DNA methylation in shift workers. DNA methylation denotes epigenetic regulation that modifies gene function and regulates gene activity without changing the sequence of bases in the DNA.
Short-term genetic changes caused by DNA methylation are not well known. While ...
LAST 30 PRESS RELEASES:
[Press-News.org] Low-loss single-mode hybrid-lattice hollow-core photonic crystal fiber