ITU-T G.654 PDF

This Recommendation describes a single-mode optical fibre which has the zero-dispersion wavelength around 1300 nm wavelength which is loss-minimized and cut-off shifted single-mode optical fibre at a wavelength around 1550 nm and which is optimized for use in the 1530-1625 nm region.

This very low loss cut-off shifted fibre (CSF) can be used for long-distance digital transmission applications such as long-haul terrestrial line systems anfd submarine cable systems using optical amplifiers. The geometrical, optical (attenuation, cut-off wavelength, chromatic dispersion and polarization mode dispersion etc.), transmission and mechanical characteristics of this CSF are described below.

Some provisions are made to support transmission at higher wavelengths up to 1625 nm. The geometrical, optical, transmission and mechanical parameters are described below in three categories of attributes:

• fibre attributes are those attributes that are retained throughout cabling and installation;

• cable attributes that are recommended for cables as they are delivered;

• link attributes that are characteristics of concatenated cables, describing estimation methods of system interface parameters based on measurements, modelling, or other considerations. Information for link attributes and system design are given in Appendix I.

This Recommendation, and the different performance categories found in the tables of clause 7, is intended to support the following related system Recommendations:

• [b-ITU-T G.957];

• [b-ITU-T G.691];

• [b-ITU-T G.692];

• [b-ITU-T G.959.1];

• [b-ITU-T G.973];

• [b-ITU-T G.977];

The meaning of the terms used in this Recommendation, and the guidelines to be followed in the measurements to verify the various characteristics, are given in [ITU-T G.650.1] and [ITU-T G.650.2]. The characteristic of this fibre, including the definitions of the relevant parameters, their test methods and relevant values, will be refined as studies and experience progress.