NEGATIVE DISPERSION OPTICAL FIBER, OPTICAL TRANSMISSION PATH, AND METHOD FOR MEASURING CHARACTERISTICS OF OPTICAL FIBER

摘要

PROBLEM TO BE SOLVED: To provide a new development to greatly enlarge an effective sectional area Aeff of a core at a wavelength 1.55 μm and to suppress optical transmission characteristics and PMD while imparting negative dispersion and negative dispersion slope characteristic comparable to those of the conventional RDF.;SOLUTION: An optical transmission path is constituted by cascade connecting a single mode optical fiber of a pre-stage and a multimode (MM) optical transmission type optical fiber (MMF) of a post stage. As a result, during the propagation light signal propagates in the single mode optical fiber of the pre-stage, the propagation of higher modes do not take place any more and the propagation of only the basic mode (base mode) of the lowermost order is made possible even with the post stage optical fiber of the multimode (MM) design and the optical fiber of the post stage having excellent characteristics can be constructed.;COPYRIGHT: (C)2004,JPO&NCIPI