G.657 optical fiber and its preform are highly discussed recently

because this kind of fiber is non-sensitive to bend

and therefore regarded as the best choice for local area network and access network such as Fiber to The Home（FTTH） systems.In this paper

Complete Synthetic Technology was taken to produce this kind of performs

key technologies were analyzed and properties of fibers drawn from these preforms were discussed.The result demonstrates that preforms fabricated in this paper reached all the requirements of bending non-sensitive optical preform

and fibers up to standards of ITU.T G657.A/B

respectively.