Bending insensitive single mode fiber and production technology thereof

Abstract

The invention discloses a bending insensitive single mode fiber. The fiber comprises a fiber core, inner cladding, subsidence cladding and outer cladding. The refractive index of the fiber core is n1, the refractive index of the inner cladding is n2, the refractive index of the subsidence cladding is n4, the subsidence cladding of the outer cladding is n3, the refractive index n1 remains unchanged along with increasing of the radius of the fiber core, the refractive index n2 remains unchanged along with increasing of the radius of the inner cladding, the refractive index n4 of the subsidence cladding is increased along with increasing of the radius until the refractive index n4 of the subsidence cladding is the same as the refractive index n3 of the outer cladding, n1>n2>n3>n4, n4 is increased along with increasing of the radius, no obvious refraction face exists, the refractive index of the interface is progressively increased from interior to exterior, and therefore optical loss due to the fact that a light intensity tail field is exposed out of the refraction face is avoided. Therefore, compared with a traditional similar optical fiber, the bending insensitive single mode fiber has the better bending resistance performance and the smaller bending loss and has the better compatibility with the G.652D.

Description

technical field [0001] The invention relates to the field of optical cables, in particular to a bend-insensitive single-mode optical fiber and a production process thereof. Background technique [0002] With the continuous development of access network and FTTH, new requirements are put forward for optical fiber. The traditional and widely used G.652 optical fiber can no longer fully meet the needs of use in some occasions, so in December 2006, ITU launched a new G.657 bending loss insensitive single mode optical fiber (bending loss insensitive single mode Optical fiber) standard, 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 as small as 7.5mm. With the continuous d...

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Problems solved by technology

The latter two types of optical fibers need to be produced by combining the traditional vapor deposition process and bubble forming process, and the process is quite complicated.

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