Because conventional SMF has a large minimum bending radius, it has been difficult to install in certain applications.
Now Sumitomo Electric Industries (SEI) has come up with a solution to the problem by developing a new type of single-mode optical fibre (SMF). Dubbed ‘PureAccess-Ultra’, the fibre features a minimum bending radius of 7.5 mm, a substantial decrease from the conventional bending radius of such fibre, which is 30 mm.
The new fibre was first shown in the SEI booth at the 3rd Fibre Optics Expo 2003, which was held at Tokyo Big Sight in Japan from January 22-24, 2003.
Despite its small bending radius, the ‘PureAccess-Ultra’ fibre has geometrical parameters that comply with the ITU-T G.652 international standard, which means that it can be used in the same way as conventional SMF.
SEI’s earlier ‘PureAccess’ product had a minimum bending radius of 15 mm, and the company is already marketing cables and cable assemblies using it.
In the future, the company plans to market both fibre products under the brand name ‘Optigate’.