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Journals and Conferences
We describe the measured group-velocity dispersion characteristics of several air-silica photonic crystal fibers with anomalous group-velocity dispersion at visible and near-infrared wavelengths. The values measured over a broad spectral range are compared to those predicted for an isolated strand of silica surrounded by air. We demonstrate a strictly… (More)
We report a silica hollow core photonic bandgap fiber with a minimum attenuation of 1.72 dB/km at 1565 nm wavelength and discuss the scaling of attenuation with wavelength and the minimum loss wavelength in this type of fiber.
Air-silica microstructured fibers are designed and fabricated to yield numerical aperture (NA) greater than 0.9. A model is presented which accurately predicts the structural parameters required in order to realize high NAs. Such fibers have application in lasers and laser-induced-fluorescence systems.
The development of artificially microstructured materials known as photonic crystals has resulted in new thinking in fiber optics. Photonic crystal fibers use the unusual properties of the new materials to deliver previously unattainable optical performance.
The properties of photonic crystal fibers with large air holes can be modeled by a silica rod in air. Such approximate calculations show that the dispersion of photonic crystal fibers could exceed -2000 ps/mm/km, or they could compensate (to within /spl plusmn/0.2%) the dispersion of 35 times their length of standard fiber over a 100-nm range.
Current and upcoming avionics systems must be able to accommodate expected growing application software volume and capability. The software domain has struggled to meet increasing demands while retaining the necessary level of confidence in its appropriate operation. Meanwhile, although computing components are becoming less expensive, the fixed and… (More)
We describe a photonic crystal fibre with an optical loss of 0.58 dB/km. We find a strong correlation between the measured loss minimum and the overall structural scale in otherwise identical fibres
We present a model for a software engineering project course that has proven successful as the capstone of our required sequence of software courses in our computer science major. It differs from many similar courses because all teams work on the same project, defined by the instructor (not projects for "real" customers). The course's project centers on… (More)
Modern systems are critically dependent on software for their design and operation. The next generation of developers must be facile in the specification, design and implementation of dependable software using rigorous developmental processes. To help prepare this generation we have developed a teaching approach and materials that serve a two-fold purpose:… (More)
Some properties of photonic crystal fibers quantitatively match those of standard step-index fibers, provided the right analogy is made between them, this is illustrated by calculations of second-mode cutoff (reported here for the first time to our knowledge) and propagation constants.