An optical transmission fiber for use in a wavelength division multiplexing transmission system is disclosed. The transmission fiber includes an inner core surrounded by a first, second and at least a third glass layer along the length of the fiber. The first glass layer has a depressed refractive-index...http://www.google.fr/patents/US6882789?utm_source=gb-gplus-shareBrevet US6882789 - Optical fiber for extended wavelength band
