The fiber complies with or exceeds ITU-T Recommendation G. Standard 60793-2-50, type B1. 2, which has the zero-dispersion wavelength around 1300 nm wavelength, shows a cut-off shift at a wavelength around 1500 nm, is loss-minimized and is optimized for use in. ITU-T Recommendation G. The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications. E fibre: empowering ultra high-capacity long-haul transmission. Coherent optical technology and G. E were introduced and have been extensively deployed worldwide. Sumitomo Electric. With the Draka LongLineTM fiber, Draka is offering the benefit of its trench assisted design for ultra-long-haul applications, allowing increased distance without regeneration and easy cabling ability. E, allow for the provision of an additional network margin that can be leveraged to enable reliable, high-data-rate transmissions over longer spans and extended reach.