Fiber series eighth week news Abstract 4
Week News Abstract For Fiber Series in 10GTEK
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Opnext drops 4.5% on high volatility
Opnext (OPXT.O), NASDAQ's 11th largest lasers systems & components company by market capitalisation, traded between an intraday low of 83.03c and a high of 92.0c, suggesting a trading opportunity between peaks and troughs. The average daily volatility of 7.5% places the stock in the 1st quartile in the market meaning it is highly volatile. Today its volatility (highest price minus lowest price/lowest price) of 10.8% was 7.4 times the average daily volatility of 1.5%, up from 8.2% on Tuesday and 4.6% on Monday. A price fall on high volatility is a bearish signal. The stock price dropped 4.06c (or 4.5%) to close at 85.95c. Compared with the NASDAQ-100 index, which fell 32.9 points (or 1.4%) on the day, this was a relative price change of -3.1%. Opnext, Inc. designs, develops, manufactures and distributes optical modules and components that transmit and receive data delivered via light in telecommunications and data communications applications, as well as lasers and infrared light emitting diodes (LEDs) for industrial and commercial applications. Its transceiver modules, which utilize its lasers and detectors, convert signals between electrical and optical for transmitting and receiving data over fiber optic networks, a critical function in optical communications equipment. Its product portfolio includes a range of solutions that vary by level of integration, communications protocol, form factor and performance level. Its portfolio primarily consists of 10 gigabits per second and 40 gigabits per second transceiver modules, including tunable transceivers, a broad line of 2.5 gigabits per second and lower speed small form-factor pluggable (SFP) transceiver modules, and new or planned products for emerging product platforms.
A Single Cell Endoscope
The U.S. Department of Energy's Lawrence Berkeley National Laboratory issued the following news release:An endoscope that can provide high-resolution optical images of the interior of a single living cell, or precisely deliver genes, proteins, therapeutic drugs or other cargo without injuring or damaging the cell, has been developed by researchers with the U.S. Department of Energy (DOE)'s Lawrence Berkeley National Laboratory (Berkeley Lab). This highly versatile and mechanically robust nanowire-based optical probe can also be applied to biosensing and single-cell electrophysiology.A team of researchers from Berkeley Lab and the University of California (UC) Berkeley attached a tin oxide nanowire waveguide to the tapered end of an optical fibre to create a novel endoscope system. Light travelling along the optical fibre can be effectively coupled into the nanowire where it is re-emitted into free space when it reaches the tip. The nanowire tip is extremely flexible due to its small size and high aspect ratio, yet can endure repeated bending and buckling so that it can be used multiple times."By combining the advantages of nanowire waveguides and fibre-optic fluorescence imaging, we can manipulate light at the nanoscale inside living cells for studying biological processes within single living cells with high spatial and temporal resolution," says Peidong Yang, a chemist with Berkeley Lab's Materials Sciences Division, who led this research. "We've shown that our nanowire-based endoscope can also detect optical signals from subcellular regions and, through light-activated mechanisms, can deliver payloads into cells with spatial and temporal specificity."Yang, who also holds appointments with the University of California Berkeley's Chemistry Department and Department of Materials Science and Engineering, is the corresponding author of a paper in the journal Nature Nanotechnology describing this work titled "Nanowire-based single-cell endoscopy." Co-authoring the paper were Ruoxue Yan, Ji-Ho Park, Yeonho Choi, Chul-Joon Heo, Seung-Man Yang and Luke Lee.Despite significant advancements in electron and scanning probe microscopy, visible light microscopy remains the workhorse for the study of biological cells. Because cells are optically transparent, they can be noninvasively imaged with visible light in three-dimensions. Also, visible light allows the fluorescent tagging and detection of cellular constituents, such as proteins, nucleic acids and lipids. The one drawback to visible light imaging in biology has been the diffraction barrier, which prevents visible light from resolving structures smaller than half the wavelength of the incident light. Recent breakthroughs in nanophotonics have made it possible to overcome this barrier and bring subcellular components into view with optical imaging systems. However, such systems are complex, expensive and, oddly enough, bulky in size."Previously, we had shown that subwavelength dielectric nanowire waveguides can efficiently shuttle ultraviolet and visible light in air and fluidic media," Yang says. "By incorporating one of our nanophotonic components into a simple, low-cost, bench-top fibre-optical set-up, we were able to miniaturize our endoscopic system."To test their nanowire endoscope as a local light source for subcellular imaging, Yang and his co-authors optically coupled it to an excitation laser then waveguided blue light across the membrane and into the interiors of individual HeLa cells, the most commonly used immortalized human cell line for scientific research."The optical output from the endoscope emission was closely confined to the nanowire tip and thereby offered highly directional and localized illumination," Yang says. "The insertion of our tin oxide nanowire into the cell cytoplasm did not induce cell death, apoptosis, significant cellular stress, or membrane rupture. Moreover, illuminating the intracellular environment of HeLa cells with blue light using the nanoprobe did not harm the cells because the illumination volume was so small, down to the picolitre-scale."Having demonstrated the biocompatibility of their nanowire endoscope, Yang and his co-authors next tested its capabilities for delivering payloads to specific sites inside a cell. While carbon and boron nitride nanotube-based single-cell delivery systems have been reported, these systems suffer from delivery times that range from 20-to-30 minutes, plus a lack of temporal control over the delivery process. To overcome these limitations, Yang and his co-authors attached quantum dots to the tin oxide nanowire tip of their endoscope using photo-activated linkers that can be cleaved by low-power ultraviolet radiation. Within one minute, their functionalized nanowire endoscope was able to release its quantum dot cargo into the targeted intracellular sites."Confocal microscopy scanning of the cell confirmed that the quantum dots were successfully delivered past the fluorescently labeled membrane and into the cytoplasm," Yang says. "Photoactivation to release the dots had no significant effect on cell viability."The highly directional blue laser light was used to excite one of two quantum dot clusters that were located only two micrometers apart.
Cheaper faster broadband on the way for Territorians.
Canberra: The Northern Territory Australia has issued the following press release:Territorians are on the way to receiving access to faster, cheaperbroadband with the country's longest fibre optic cable switched on in Darwin today.Chief Minister Paul Henderson today joined Acting Prime Minister and Treasurer Wayne Swan in Darwin to mark the completion of a 3800km fibre optic link from Darwin to Toowoomba."Nowhere in the country is more deserving of this project than theTerritory; Territorians pay more for their internet and face great challenges of distance," Mr Henderson said?"That's why we lobbied to be one of the first places in the country to benefit from this project which will bring faster cheaper broadband to Territory households and businesses."The completion of the Darwin fibre optic backbone link provides amassive injection of competition into the market to drive down the cost of internet services in the Territory."With the completion of this project the infrastructure is now open for business for new services providers to come into the market in the New Year and give Territorians better value for money."This key infrastructure will also make the Territory more attractive to do business, particularly among the resources sector which relies heavily on fast and reliable telecommunications."Unlike the CLP we refused to stand aside and let tight market forces drive up the cost of internet services in the Territory - insteadwe lobbied for investment in key infrastructure to drive down cost for Territorians."Chief Minister Paul Henderson said the Darwin fibre optic backbonelink built under the Regional Blackspots Program provides a backbonefor the NBN to be rolled out from next year.
"Work will begin next year on allowing the first 20,000 homes to be connected," Mr Henderson said."It builds on our key target under the Territory 2030 strategic plan to grow the Territory's economy, and improving our telecommunications network is a big part of this."The Nextgen optic fibre connection to Alice Springs is already seeing several new providers delivering competitive broadband services including Internode, the first alternative ADSL2+ services to those offered by Telstra.
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