Summary

This Recommendation describes the geometrical, mechanical, and transmission attributes of a single‑mode optical fibre which has the absolute value of the chromatic dispersion coefficient greater than some non-zero value throughout the wavelength range from 1530 nm to 1565 nm. This dispersion reduces the growth of non-linear effects which are particularly deleterious in dense wavelength division multiplexing systems. This is the latest revision of a Recommendation that was first created in 1996. This revision adds two new categories of this fibre in Tables D and E. Both of these categories limit the chromatic dispersion coefficient by a pair of bounding curves vs wavelength for the range of 1460 nm to 1625 nm. Although the dispersion can change sign at wavelengths less than 1530 nm, the inclusion of these lower wavelengths is intended to provide information to support coarse wavelength division multiplexing applications which do not have significant non-linear impairments, at channels from 1471 nm and higher. These tables are introduced to distinguish the two main families of G.655 fibres that are supported by multiple vendors. Tables A, B, and C have not been changed. Tables A and B are not included in this version of this Recommendation, but are in the 2003 edition.