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  • Volume 37, Issue 12

    • Volume 37, Issue 12

    More content from Volume 37, Issue 12

    Fiber cooling involves coupling light from a laser diode into a special doped fiber mounted on two pairs of crossed silica fibers to reduce the heat load on the fiber. A microthermocouple is mounted on a rotating shaft, controlled by a stepper motor, so that it can be brought into contact with the fiber as required. A shutter attached to the shaft keeps laser radiation from heating the microthermocouple.
    Australian researchers have reported cooling optical fiber below room temperature using laser light, a promising step toward manufacturing high-output lasers with no internal ...
    Dec. 1, 2001
    FIGURE 1. 10 Gigabit Ethernet aggregates signals from many slower inputs. Unlike time-divsion multiplexing systems, the total capacity of the inputs can be higher than the total capacity of the output, because the inputs are generally not filled to capacity.
    Many vendors anticipate demand for the 10 Gigabit Ethernet standard that will speed signals hrough both high-bandwidth and standard step-index fiber.
    Dec. 1, 2001
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    To imagine 100-kW diode arrays becoming a common reality, two key elements of the technology need to fall into place: high-performance diode bars, and heat sinks that offer excellent...
    Dec. 1, 2001
    Aberdeen predicts a competitive market for integrated optics; Biophan announces MRI-compatible optical pacemaker; OSRAM and OTM Technologies sign joint development agreement.....
    Dec. 1, 2001
    Nuvonyx CEO to speak at Marketplace Seminar; Ultrafast laser writes interleaver with 400-GHz channel spacing; All-dielectric micromirrors minimize temperature deformation...
    Dec. 1, 2001
    Polaroid files for bankruptcy; ZBD Displays gets £2-million second round of funding; PerkinElmer settles with IRS...
    Dec. 1, 2001
    Cree to begin marketing blue laser diode; TerraPoint lidar assesses transmission lines; Coherent sales increase in fourth fiscal quarter...
    Dec. 1, 2001
    Technical developments in optoelectronics are the power behind advances in science, industry, medicine, and even marketing.
    Many people would agree that art and science inhabit separate worlds. Few scientists create memorable art, while few artists contribute directly to science. But there is one area...
    Dec. 1, 2001
    FIGURE 1. Fiber microcoupler was tapered using a CO2 laser. The fused interaction region is about 200 microns long - reportedly the shortest fiber coupler ever.
    A laser beam is small and easy to position, making it useful in forming high-resolution structures in fiber on a much smaller scale than is possible with other heat sources, such...
    Dec. 1, 2001
    While current electrical monitoring methods allow periodic testing of MEMS devices, optical methods are expected to provide continuous testing. The combination of information from both methods is expected to offer advantages for lifetime monitoring and fault analysis.
    Researchers at the University of West Virginia (UWV; Morgantown, WV) have begun to collaborate with researchers at the Jet Propulsion Laboratory (JPL; Pasadena, CA) to develop...
    Dec. 1, 2001
    (Photo courtesy of Harvard University)
    Scanning electron micrographs show an array of aluminum rings fabricated on calcium fluoride by a lithographic technique that is based on an elastomeric phase mask brought into contact with photoresist. The array produces a transmission band with a peak at 7.07 µm, a relative transmission of just under 90%, and a full-width at half-maximum bandwidth of approximately 5 µm.
    Filters that select certain electromagnetic wavelengths and reject others can be constructed from arrays of metallic features with dimensions somewhat less than the wavelength...
    Dec. 1, 2001
    (Photo courtesy of University of Bremen)
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    Plastic optical fibers are being examined as an inexpensive alternative to glass fibers for short optical-data transmission lengths. As with any fiber, matching the wavelength...
    Dec. 1, 2001
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    PC-based imaging module; Miniature power supplies; CO2 lenses and windows; Fiberoptic curing ovens...
    Dec. 1, 2001
    From the scientific sessions and short courses to the exhibit hall and plenary talks, Photonics West 2002, to be held Jan. 19 to 25 in San Jose, CA, will showcase the innovations...
    Dec. 1, 2001
    (Photo courtesy of University of Hamburg)
    The linewidth of a 657-nm-emitting laser diode is reduced to below 30 Hz. A holographic grating (at center) forming an extended cavity provides fine frequency tuning, while large frequency excursions are compensated for by a fast injection-current feedback loop. A Fabry-Perot resonator provides the frequency reference.
    Laser diodes are used far and wide largely because they are small, rugged, and efficient sources of coherent light. Though the devices have many desirable intrinsic properties...
    Dec. 1, 2001
    A preliminary 3-D representation of the World Trade Center site, based on ALSM data.
    Laser-based thermal mapping is playing a key role in helping officials better assess the damage done by the Sept. 11 terrorist attacks on the World Trade Center (WTC).
    Dec. 1, 2001
    First generation of MOEMS infrared sensing device is expected to begin sampling in December and January for combustible gas and carbon dioxide applications.
    Engineers at Ion Optics (Waltham, MA) and researchers at the Jet Propulsion Laboratory (JPL; Pasadena, CA) have collaborated to develop a micro-optical electromechanical system...
    Dec. 1, 2001
    Sprint awards $1.1 billion deal to Nortel Networks; EXFO completes acquisition of Avantas Networks; TranSwitch licenses serial link technology from Rambus...
    Dec. 1, 2001
    The OSA annual meeting included technical presentations as well as speakers who focused on the theme of entrepreneurship in optics.
    While annual meetings of Optical Society of America (OSA; Washington, DC) are smaller than major events such as CLEO and OFC, attendance at this year's meeting held Oct. 14 to...
    Dec. 1, 2001
    Electronic image-display technology dates back more than a century to 1897 when German scientist Karl Ferdinand Braun invented the first cathode ray tube (CRT) scanning device...
    Dec. 1, 2001
    A few years ago, there was great interest in the personal-computer industry in the so-called "information appliance." This was to be a device that would supplant the difficult...
    Dec. 1, 2001
    Meetings, Courses, and Calls for Papers, covering January through September 2002.
    Dec. 1, 2001
    FIGURE 1. A pump or source laser consists of a laser cavity (waveguide ridge with coated end facets) and its associated electrical connections.
    In today's challenging market, photonics manufacturers have taken note of process yield improvements in the data storage industry, and are taking steps to similarly integrate ...
    Dec. 1, 2001