Two years ago, UV-improved (UVI-) fibers were described for the first time. These fibers show significantly reduced UV-absorption around 215 nm during the transmission of UV-light from different UV-sources like deuterium-lamps, excimer-lasers and frequency-doubled tunable dyelasers. This improvement has been realized due to a passivation of the generated UV-defects by gas-doping.Depending on the ambient temperature and the fiber diameter, the lifetime of UV-stability was quite different in these first generation UVI-fibers. This long-term behavior has been studied with different illuminations, temperatures and fiber diameters; there is a good agreement between experimental and theoretical data. Additional modifications have lead to a further improvement in the long-term stability. The predicted lifetime of these UVI2-fibers (<1 50 pm) of the second generation at room temperature is longer than I year. In addition, a short-term behavior was observed using diode-array spectrometer. In this case, the influence of temperature on the transient induced losses is significant and will be described.
Adequate therapy of the underlying cause of Cheyne-Stokes breathing such as end-stage congestive heart failure might sufficiently abolish any breathing abnormalities.
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