CN104597561A - Small size optical fiber and manufacturing method thereof - Google Patents

Abstract

The invention provides a small size optical fiber comprising a glass portion with the outer diameter of 125 micrometer and a coating layer coating the glass portion evenly. The outer diameter of the coating layer is of 200 micrometer. The coating layer includes an inner coating layer and an outer coating layer outside the inner coating layer, and the outer diameter of the inner coating layer is of 160 micrometer. The glass portion is made of optical fibers G657A2 by drawing. The optical fibers G657A2 are adopted for manufacturing the glass portion, and the excellent bending performance is maintained on the condition of decreasing the coating thickness greatly; the low modulus coating and proper inner and outer coating layer thickness ratio are adopted, so that the requirements of relevant standards can be met completely according to the mechanical and environmental performances of the 200 micrometer small size optical fiber; the diameter of the optical cable made of the small size optical fiber can be decreased by 10%, the optical fiber capacity increased by 40%, the number of optical fiber cores in unit section area can be increased significantly, the fiber cable arrangement cost is reduced, and the pipeline spatial resource is saved.

Description

A kind of small size optical fiber and manufacture method thereof

Technical field

The invention belongs to optic fibre manufacturing technology field, especially relate to a kind of small size optical fiber and manufacture method thereof.

Background technology

Along with the development that Networks of Fiber Communications is built, cable run route resource problem seems more and more important.And along with the development in city, the cost of communication pipe can be more and more higher, and especially in the urban area of some maturations, urban planning, reason exploitation etc. are shaped already, do not have also cannot build new communication pipe suitable opportunity.The resource utilization of therefore how laying more optical fiber increase pipeline space at existing conduit resource becomes operator needs the urgent major issue solved.

Utilize maximized needs for adapting to conduit resource, optical cable miniaturization becomes new development trend.Optical cable is small-sized can be solved by two kinds of methods, and the first reduces casing wall thickness, but the reduction of wall thickness will directly cause the reduction of optical fiber compressive strength, because be only unworkable with the method for the object reaching optical cable miniaturization by reducing casing wall thickness.Its two be reduce casing inner diameter, when wall thickness is constant, its compressive strength of the minimizing of internal diameter increases on the contrary, thus reduce casing inner diameter reach reduce cable size be feasible to reach the method for the object of optical cable miniaturization.

If optical cable internal diameter will keep number of fibers constant while reducing, then sleeve pipe inner fiber external diameter must reduce.Because the diameter reducing glass part can have a huge impact the performance such as fused fiber splice, physical strength, so fiber size can only be reduced by reducing coat thickness.

In prior art, we are by reducing the external diameter of low loss fiber to meet the needs of air-blowing micro-cable to little external diameter optical fiber.But its very thin internal coating of optical fiber significantly reducing external diameter can not cushion transverse stress, so microbending loss can obviously increase, cause optical cable in use, especially under ultimate temperature, fibre loss increases, and influential system runs.

Summary of the invention

In view of this, the present invention is intended to propose a kind of small size optical fiber and manufacture method thereof, fully improves unit cross-sectional area inner fiber core number, reduces fiber cable laying cost, save pipeline space resource.

For achieving the above object, technical scheme of the present invention is achieved in that

A kind of small size optical fiber, comprises external diameter and remains on the glass part of 125 μm and the coat of the outside evenly coating of glass part; Described coat external diameter is 200 μm.

Further, described coat comprises the outer coat outside interior coat and interior coat.

Further, described interior coat external diameter is 160 μm.

Further, described glass part is formed by G657A2 fibre-optical drawing.

A manufacture method for small size optical fiber, comprises the steps:

1. use G657A2 fibre-optical drawing glass part, make its diameter remain on 125 μm.

2. with low modulus coating, ground floor coating is carried out to the glass part that 1. step is drawn into, make this interior coat diameter control at 160 μm.

3. on the optical fiber of ground floor coating, carrying out second layer coating, the outer coat external diameter of second time coating is controlled at 200 μm.

Relative to prior art, a kind of small size optical fiber of the present invention and manufacture method thereof have following advantage:

1) adopt G657A2 fibre-optical drawing to become glass part, it still can keep excellent bending property when significantly reducing coating thickness.

2) by adopting the coating of low modulus and suitable inside and outside coating thickness proportion, the machinery of the small size optical fiber of 200 μm and environmental performance is made also can to meet relevant criterion requirement completely.

3) optic cable diameter of small size optical fiber production provided by the invention decreases beyond 10%, and fiber capacity improves 40%, fully can improve unit cross-sectional area inner fiber core number, reduces fiber cable laying cost, saves pipeline space resource.

Accompanying drawing explanation

The accompanying drawing forming a part of the present invention is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:

Fig. 1 is structural representation of the present invention;

Fig. 2 is the microbend performance comparison diagram of G652D and G657A2 optical fiber at 1550nm window place of 200 μm;

Fig. 3 is Weibull curve distribution schematic diagram of the present invention;

Fig. 4 is product high temperature performance test data of the present invention;

Fig. 5 is conventional 245 μm of external diameter optical fiber and fibre optic installations core number contrast table of the present invention.

Description of reference numerals:

1-glass part, coat in 2-, the outer coat of 3-.

Embodiment

It should be noted that, when not conflicting, the embodiment in the present invention and the feature in embodiment can combine mutually.

Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.

A kind of small size optical fiber, as shown in Figure 1, comprises external diameter and remains on the glass part 1 of 125 μm and the coat of the outside evenly coating of glass part 1; Described coat external diameter is 200 μm.

Wherein, described coat comprises the outer coat 3 outside interior coat 2 and interior coat 2.

Wherein, described interior coat 2 external diameter is 160 μm.It should be noted that, coat 2 and this thickness proportion of outer coat 3 in keeping, can better make interior coat 2 play buffer action and outer coat 3 plays mechanical protection effect.

Wherein, described glass portion, 1 is formed by G657A2 fibre-optical drawing.Because the index distribution that G657A2 optical fiber is special, the resist bending performance of the excellence that itself possesses, so still keep outstanding bending property when significantly reducing coating thickness to 200 μm.Fig. 2 is the microbend performance of G652D and G657A2 optical fiber at 1550nm window place of 200 μm, and after G652D optical fiber is down to 200 μm, its micro-curved additional attenuation acutely increases, and can not meet Production requirement; And the microbend performance of 200 μm of G657A2 optical fiber shows very excellent, complete and meet standard-required.

Manufacture a method for above-mentioned small size optical fiber, comprise the steps:

1. use G657A2 fibre-optical drawing glass part 1, make its diameter remain on 125 μm;

2. with low modulus coating, ground floor coating is carried out to the glass part 1 that 1. step is drawn into, make ground floor coat (interior coat 2) diameter control at 160 μm; It should be noted that, low modulus coating here can adopt DSM Supercoating optical fiber coatings.

3. on the optical fiber of ground floor coating, carrying out second layer coating, outer coat 3 external diameter of second time coating is controlled at 200 μm.

By using special low modulus coating and optimum inside and outside coat thickness ratio, except having except certain help to the bending property of 200 μm of small size optical fiber, the machinery of small size optical fiber and environmental performance can be made all to reach standard-required, Weibull curve distribution as shown in Figure 3 can find out that the mechanical property of small size optical fiber does not decline, and can ensure 25 year life-span of optical fiber.Optical fiber high/low temperature test value shown in Fig. 4, also much smaller than the 0.05dB/km of standard specification, meets standard-required.

After the small size optical fiber of 200 μm ensure that optical fiber property meets standard-required, because the significantly minimizing of its size, its cable size of producing can be made also significantly to reduce.

As shown in Figure 5, if lay conventional micro-cable, be in the silicone pipes of 40/33mm, to hold at most the sub-pipe of 5 10/8mm a specification, the maximum core number that can lay optical fiber is 360 cores, if lay micro-cable of small size optical fiber, then can lay the sub-pipe of 7 8/6mm in silicone pipes, the maximum core number that can lay is 504 cores, and fiber cores density increases by 40%.

Therefore, the optic cable diameter of small size optical fiber production provided by the invention decreases beyond 10%, and fiber capacity improves 40%, fully can improve unit cross-sectional area inner fiber core number, reduces fiber cable laying cost, saves pipeline space resource.

The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (5)

1. a small size optical fiber, is characterized in that: comprise external diameter and remain on the glass part of 125 μm and the coat of the outside evenly coating of glass part; Described coat external diameter is 200 μm.

2. a kind of small size optical fiber according to claim 1, is characterized in that: described coat comprises the outer coat outside interior coat and interior coat.

3. a kind of small size optical fiber according to claim 2, is characterized in that: described interior coat external diameter is 160 μm.

4. a kind of small size optical fiber according to claim 1, is characterized in that: described glass part is formed by G657A2 fibre-optical drawing.

5. a manufacture method for small size optical fiber described in claim 1, is characterized in that, comprise the steps:

1. use G657A2 fibre-optical drawing glass part, make its diameter remain on 125 μm;

2. with low modulus coating, ground floor coating is carried out to the glass part that 1. step is drawn into, make this interior coat diameter control at 160 μm;

3. on the optical fiber of ground floor coating, carrying out second layer coating, the outer coat external diameter of second time coating is controlled at 200 μm.