Bending-insensitive single mode fiber and manufacturing method thereof

Abstract

The invention discloses a bending-insensitive single mode fiber and a manufacturing method of the bending-insensitive single mode fiber. The bending-insensitive single mode fiber comprises a fiber core and wrapping layers, wherein the wrapping layers outside the fiber core sequentially include the inner wrapping layer, the fluorine-doped refractive index lowering wrapping layer and the outer wrapping layer from inside to outside. The manufacturing method of the bending-insensitive single mode fiber includes the following steps of firstly, manufacturing a mandrel according to a VAD method; secondly, manufacturing the fluorine-doped refractive index lowering wrapping layer according to an OVD method; thirdly, depositing the outer wrapping layer outside the fluorine-doped refractive index lowering wrapping layer to obtain a fluorine-doped wrapped pipe; fourthly, inserting the mandrel into the fluorine-doped wrapped pipe, and sintering the mandrel and the fluorine-doped wrapped pipe into a whole; fifthly, conducting optical fiber wire drawing so that the manufactured optical fiber stick can be drawn to form an optical fiber. Compared with a traditional similar optical fiber, the bending-insensitive single mode fiber has better bending prevention performance and smaller bending loss and can be better compatible with G.652D, and the manufacturing method is simple.

Description

technical field [0001] The invention relates to the field of optical fibers, in particular to a bend-insensitive single-mode optical fiber and a manufacturing method thereof. Background technique [0002] With the continuous development of access network and FTTH, new requirements are put forward for optical fiber. At this time, the traditional and widely used G.652 optical fiber can no longer fully meet the use requirements in some occasions. Therefore, in December 2006, the ITU The new standard of G.657 bending loss insensitive single mode optical fiber (bending loss insensitive single mode optical fiber) was launched. G.657 fiber is divided into two types: G.657A and G.657B. G.657A needs to be fully compatible with conventional G.652D optical fibers, and the bending radius can be as small as 10mm; G.657B optical fibers are not required to be fully compatible with G.652D optical fibers, but there are higher requirements for bending performance. The bending radius can be a...

AI Technical Summary

Problems solved by technology

[0017] Standard optical fiber, annular groove-shaped depressed cladding optical fiber and randomly distributed micro-hole cladding optical fiber can all be produced by the traditional light rod vapor deposition process, and the annular groove-shaped depressed cladding refractive index distribution fiber has the best bending resistance effect, and the ring The groove-shaped depressed cladding refractive index fiber and the randomly distributed microhole cladding fiber need to be produced by combining the traditional vapor deposition process and the bubble forming process, and the process is quite complicated.

However, the bending resistance effect of traditional bend-insensitive single-mode fiber needs to be improved, and the compatibility with G.652D also needs to be improved

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