Optical fiber for transmission of wavelength division multiplexing, has core presenting variable index profile than sheath of constant index, and buried section of minimum index with index lower than sheath index

摘要

The fiber has a core extending successively from a center towards a periphery and presenting a variable index profile than a sheath of constant index. A central section of maximum index and a buried section of minimum index has index higher and lower than a sheath index, respectively. A circular index section has an index higher to the sheath index and lower to the central section index. Independent claims are also included for the following: (a) a transmission system on a distance lower at 350 kilometer having a optical fiber; and (b) an association of a part of the metropolitan transmission network on a distance lower at 350 kilometer and another part of access network.