One of the latest advances in optical fiber technology is nitro- gen-doped-silica-core pure-silica-cladding fibers prepared by SPCVD.1–3 By now, losses of 0.5 dB/km at λ = 1.30 µm and 0.3 dB/km at λ = 1.55 µm have been achieved in the N-doped fibers,3 but these values are not limiting. It is conceivable that in the near future N-doped fibers will become quite competitive with conventional fibers. In this connection it is important to take a closer look at the new opportunities offered by the new glass net.

© 1996 Optical Society of America

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