G.655 is an

international standard international standard is a technical standard developed by one or more international standards organizations. International standards are available for consideration and use worldwide. The most prominent such organization is the International Or ...

that describes the geometrical, mechanical, and transmission attributes of a

single-mode A transverse mode of electromagnetic radiation is a particular electromagnetic field pattern of the radiation in the plane perpendicular (i.e., transverse) to the radiation's propagation direction. Transverse modes occur in radio waves and microwav ...

optical fibre and cable, developed by the Standardization Sector of the

International Telecommunication Union The International Telecommunication Union is a specialized agency of the United Nations responsible for many matters related to information and communication technologies. It was established on 17 May 1865 as the International Telegraph Unio ...

(

ITU-T The ITU Telecommunication Standardization Sector (ITU-T) is one of the three sectors (divisions or units) of the International Telecommunication Union (ITU). It is responsible for coordinating standards for telecommunications and Information Commu ...

) that specifies one of the most popular types of

single-mode optical fiber In fiber-optic communication, a single-mode optical fiber (SMF), also known as fundamental- or mono-mode, is an optical fiber designed to carry only a single mode of light - the transverse mode. Modes are the possible solutions of the Helmholtz ...

(SMF) cable.

Standard

The standard specifies the geometrical, mechanical, and transmission attributes of a single-mode optical fibre as well as its cable. The range of mode field diameter permitted in G.655 is 8 to 11 µm in non-zero dispersion-shifted fibre. G.655.C fibre has a maximum PMD link design value of 0.20 ps/sqrtkm, which is the lowest value recommended by ITU-T. G.655 has the cable cut-off wavelength and cable attenuation coefficients in the C and L bands.{{Cite web, title=G.655: Characteristics of a non-zero dispersion-shifted single-mode optical fibre and cable, url=https://www.itu.int/rec/T-REC-G.655/, url-status=live, archive-url=https://web.archive.org/web/20210410122707/https://www.itu.int/rec/T-REC-G.655/, archive-date=2021-04-10, access-date=2021-04-10, website=www.itu.int

External Links

ITU-T Recommendation G.655
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References

ITU-T recommendations ITU-T G Series Recommendations