654 describes the geometrical, mechanical and transmission attributes of a single-mode optical fibre and cable which has the zero-dispersion wavelength around 1300 nm wavelength, and which is loss-minimized and cut-off wavelength shifted at around the. Recommendation ITU-T G. To support these high capacity systems in terrestrial backbone networks, low attenuation and large core area fibers compliant with Recommendation ITU-T G 654. E were introduced and have been extensively deployed worldwide. E. Coherent optical technology and G. E fibre: a high-performance, sustainable networking solution. Sumitomo Electric Industries, Ltd. G654:Ultra low loss optical fiber, mainly used for transoceanic optical cable. The common core is pure SiO2,while the ordinary ones need to be doped with germanium. Through. This is equivalent to 1% strain STL controls every stage of the manufacturing process so that quality is built in to every meter of fiber, rather than selected out at the end through testing.