Bend-insensitive Single-Mode Fibers are being broadly used to support the fiber to the home (FTTH) applications.
Along with extensive FTTH applications, the demand for fibers with smaller bend radius is increasing. The fibers could be easily installed at a small angle, tight limited spaces of fiber distribution panels, termination boxes, wall mount outlets in FTTx fiber access network, without causing higher attenuation of fiber in 1550nm wavelength.
The ITU-T Recommendation for Bend Insensitive Singlemode Fibre is G.657.
G.657 fiber is divided into 2 main categories:
- G.657.A – Fibers for Access Networks
- G.657.B – Fibers for short distances at the end of Access Networks
Each Category of G.657 fiber is divided into 2 sub-categories:
- G657 A1 and G657 A2
- G657 B2 and G657 B3
The main difference between these sub-categories are the minimum bending radius:
|Fiber Type||Bend Radius|
The other category, G.657.B does not need to be compliant with G.652 fibers. Therefore G.657.B fibers are mostly used in indoor fiber optic cables that are installed with field installable optical connectors.