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Features
Europe's Telcos Gird for Traffic Onslaught
European telecommunications companies, anticipating the demand for delivery of interactive multimedia services to business and residential customers, are busy planning for tomorrow. On the drawing boards are broadband networks designed for increasing the traffic-carrying capability of core transport networks.Today’s modern networks are based on electronic synchronous digital hierarchy (SDH), the electronic successor to Europe’s plesiochronous digital hierarchy (PDH). SDH’s improved signal...
Photonics Spectra, February 1997
Fiber-Free Laser Communications Soar to 'Unheard of' Heights
When telecommunications companies first looked for solutions to the overcrowded world of wired, electronic communication, coherent light and fiber optics were there. Fiber optics brought high-bandwidth communications without the electromagnetic...
Photonics Spectra, February 1997
High-Power Diode Lasers Earn a New Image
The growth and development of continuous-wave high-power diode lasers in the last few years has been phenomenal, enabling many advances in a wide range of applications. Diodes’ efficiency, compactness and cost-effectiveness make them an excellent...
Photonics Spectra, February 1997
Integrated Optics: Molding Photonic Components into Solutions
Instrumentation and consumer product designers are enamored of photonics technology. Products containing lasers, LEDs and detectors abound on the shelves of electronics stores, appliance centers and even the corner gas station. Photonics makes new...
Photonics Spectra, February 1997
Spatial Light Modulators Help Machines 'See' Faster
Once, our eyes were all the quality control we needed. But as products became more complex -- containing more, smaller parts -- so did the need for quicker, more efficient inspection techniques. Photonics technology has mirrored the increasing...
Photonics Spectra, February 1997
A Bright Future for Organic Light-Emitting Diodes
Organic materials are part of our everyday life, but only recently have photonic devices begun to exploit their versatility. For more than 20 years it was common knowledge that organic crystals exhibited electroluminescence when large voltages were...
Photonics Spectra, January 1997
All Solid-State Lasers: An Industry Option with Big Potential
Improvements in the size, power, lifetime and ruggedness of solid-state lasers has truly improved their chances in a marketplace that sees a laser as a device and not necessarily a tool. As applications for solid-state devices grow, researchers will...
Photonics Spectra, January 1997
Automation Boosts Low-Cost Fiber Pigtailing
The explosive increase of fiber optics in communications, materials processing and medicine is driving both performance and manufacturing technology improvements in fiber optic interconnects. However, the task of accurately aligning and affixing...
Photonics Spectra, January 1997
CMOS Imaging Approaches Stage Three in its Evolution
Proving that imaging based on complementary metal oxide semiconductors (CMOS) could compete with CCDs was a multifaceted effort. The first step was developing a working product. The second phase was to prove that CMOS imaging could compete...
Photonics Spectra, January 1997
IR Imaging Arrays Turn to Quantum Wells
A new semiconductor-based infrared detector technology for mid- and long-wavelength instruments is ready for the marketplace. The quantum-well infrared photodetector (QWIP) is based on absorption by confined carriers in multiple quantum wells. QWIPs...
Photonics Spectra, January 1997
Laser Fusion: An Old Dream Nears Realization
When completed in 2002, the National Ignition Facility will culminate more than a decade of research on laser ignition: the controlled implosion of a small, hydrogen-isotope-filled target by laser beams of sufficient energy and quality to create...
Photonics Spectra, January 1997
Long-Period Gratings: Next Generation of Fiber Sensors
Fiber optic sensors, thanks to their size, flexibility and survivability advantages, continue to gain popularity as effective alternatives to conventional transducers. Two types have emerged as leaders in meeting the changing needs of industrial...
Photonics Spectra, January 1997
Micro-Opto Electromechanics Could Revolutionize Photonic Systems
Advances in micro-optics have led to the development of large-volume and batch-processed diffractive and refractive micro-optical components, creating a technology that promises to revolutionize many photonic systems. Similar to micro-optic...
Photonics Spectra, January 1997
Microlasers Can Anticipate Expanding Market
The air-cooled argon-ion laser remains the most widely used source OEM applications requiring blue or green light. However, its shortcomings in efficiency, size, operating life and cost have inhibited the growth and development of applications....
Photonics Spectra, January 1997
Microscopy: Old Technology Gets New Life
Over the last 150 years of microscope development, an impressive array of innovations has come to light. Today’s seemingly commonplace imaging techniques include phase contrast, which won a Nobel prize for the Zeiss developer Frits Zernicke when...
Photonics Spectra, January 1997
Modular CCDs: Building Blocks for Large-Area Sensors
Using the concept of a jigsaw puzzle, the latest generation of high-resolution imagers is built up from several pieces of 1-megapixel blocks. Philips joins the pieces together using dedicated stitching patterns available on the masks during the...
Photonics Spectra, January 1997
Optical Software Undergoing Dramatic Change
Lens design software once was characterized by large, expensive and user-unfriendly programs running on large, expensive and painfully slow mainframe computers. Lens design was almost exclusively the domain of dedicated professionals in classical...
Photonics Spectra, January 1997
PC-Based Laser Analyzers: New Uses Require Improved Devices
Over the past few years the beam-profile quality of lasers has risen dramatically. Nevertheless, competitive pressures and demanding applications require even higher beam quality and are pushing the capabilities of many lasers. The only way to...
Photonics Spectra, January 1997
Raman Spectroscopy: Ready to Meet New Challenges
Once the realm of a few theorists, Raman spectroscopy has surged in popularity during the last decade. Improvements in optics, lasers, detectors and data analysis techniques have turned this laboratory technique into an industrial tool used even in...
Photonics Spectra, January 1997
Replica Molding: Complex Optics at Lower Costs
Researchers at Harvard’s Chemistry Department are exploring new ways of fabricating complex, optically functional surfaces, components and devices using elastomers as starting materials. Organic polymers in elastomeric molds show promise because...
Photonics Spectra, January 1997
Smart Lightpipe Designs Provide Cost-Effective Optics
For a technology that doesn't get much respect, lightpipes are undergoing remarkably rapid applications growth. Lightpipes carry light from sources -- incandescent or fluorescent lamps or light-emitting diodes -- to illumination tasks. Applications...
Photonics Spectra, January 1997
The Proactive View From Germany
As part of a joint presentation on Germany’s drive to keep pace in global, high-tech competition in research development and production, the Institute for Economic Research in Hamburg, Germany, suggests that the country must embrace an economic...
Photonics Spectra, January 1997
We Need to Curb Conflicts in Global High-Tech
There is remarkably little multinational cooperation for the development of new, commercially relevant technologies. There are regional efforts -- notably among the members of the European Union - but, even in Europe, national programs dominate...
Photonics Spectra, January 1997
Diode-Pumped Solid-State Lasers Find Their Place in the Lab
The $100 million-plus annual scientific laser market continues to be a prime area of opportunity and focus despite limited research and development expenditures in recent years. Historically dominated by gas, lamp-pumped solid-state and dye lasers,...
Photonics Spectra, December 1996
Laser Advances Spark Ultrafast Studies
Advances in solid-state short-pulse laser oscillators, amplifiers and ultrafast optics have sparked an explosion in the number of studies of ultrafast phenomena. These experiments include direct control of chemical reactions, direct observations of...
Photonics Spectra, December 1996
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