{{short description|ITU-T Recommendation}} {{Infobox technology standard | title = G.655 | organization = ITU-T | license = Freely available | domain = telecommunication | abbreviation = | related_standards = G.651.1, G.652, G.657 | base_standards = | committee = Study Group 15 | preview_date = | long_name = | preview = | version_date =November 2009 | version = (11/09) | year_started = 1996 | status = In force | caption = | image = | website = https://www.itu.int/rec/T-REC-G.655 }}
'''G.655''' is an international standard that describes the geometrical, mechanical, and transmission attributes of a single-mode optical fibre and cable, developed by the Standardization Sector of the International Telecommunication Union (ITU-T) that specifies one of the most popular types of single-mode optical fiber (SMF) cable.<ref>{{Cite web|date=30 April 2004|title=ITU Standard Gives Operators Brighter Future Latest Recommendation Lights Up More Optical Fibre|url=https://www.itu.int/ITU-T/news/g656v4.html|url-status=live|archive-url=https://web.archive.org/web/20210410115524/https://www.itu.int/ITU-T/news/g656v4.html|archive-date=2021-04-10|access-date=2021-04-10|website=International Telecommunication Union}}</ref>
== 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 (NZ-DSF). 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.<ref>{{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}}</ref>
Large effective area fiber (LEAF) optical fiber is an example of G.655 commonly called NZ-DSF.<ref>{{Cite web |title=LEAF Optical Fiber {{!}} Non-zero Dispersion-shifted Fiber (NZDSF) {{!}} Corning |url=https://www.corning.com/optical-communications/worldwide/en/home/products/fiber/optical-fiber-products/leaf-fiber.html |archive-url=http://web.archive.org/web/20241116045342/https://www.corning.com/optical-communications/worldwide/en/home/products/fiber/optical-fiber-products/leaf-fiber.html |archive-date=2024-11-16 |access-date=2026-01-20 |website=www.corning.com |language=en-us}}</ref>
== External links ==
[https://www.itu.int/rec/T-REC-G.655/ ITU-T Recommendation G.655] == References == <references />
Category:ITU-T recommendations Category:ITU-T G Series Recommendations