Different implementations of G.657B bend-insensitive single-mode fibers with ultra-low bend losses, still compatible to G.652D
Conference: Kommunikationskabelnetze - 15. ITG-Fachtagung
12/09/2008 - 12/10/2008 at Köln, Germany
Pages: 5Language: englishTyp: PDFPersonal VDE Members are entitled to a 10% discount on this title
Berkers, A.; Montmorillon, L.-A. de; Richard, S.; Sillard, P.; Gasca, L. (Draka Communications, Marcoussis, France)
Kuyt, G. (Draka Communications, Eindhoven, Netherlands)
Single Mode Fibers (SMF) showing improved bending resistance compared with standard G.652D SMF are mandatory for the Fiberto- the-Home deployment (cf. ITU-T G657A&B recommendation). Different profile designs allow reaching G.657B bend-losses levels while staying compatible with the legacy G.652D recommendation. They all exhibit a depressed refractive index area in the cladding layer near the core that enables improved confinement of the light to the core area. Recently, questions have been raised concerning the bend-loss for extreme conditions; suggestions have been made to specify fiber bend radius as low as 5mm. In this paper we address this development and compare the performances of three different types of structures, as well as standard step-index fibers (i.e. without any cladding assistance) for the sake of comparison. At last, we discuss the impact of the heterogeneity of the profile over a cross section on the fiber characteristics and in particular on the bend-loss performances.