CN104062703B - A kind of bending resistance refractive power is fine - Google Patents

Abstract

The invention belongs to technical field of optical fiber, especially relate to a kind of bending resistance refractive power fine, it includes fibre core, be positioned at fibre core outside covering, be positioned at the coat outside covering, be positioned at coat outside dyed layer, it is characterised in that: also have a bend resistance outer layer between coat and dyed layer；Appoint and take a segment length to be not less than the bending resistance refractive power of 10cm fine, by bending resistance refractive power fibre two ends simultaneously equidirectional through internal diameter be 2mm cylindrical hole after bending resistance refractive power fibre do not rupture；In described bending resistance refractive power fibre, the refractive index of the refractive index > bend resistance outer layer of the refractive index > coat of the refractive index > covering of fibre core.The present invention has following main beneficial effect: simple in construction, easily realize, there is excellent folding quality, use wider, for construction time bending require lower.

Description

A bend-resistant optical fiber

technical field

The invention belongs to the field of optical fiber technology, in particular to a bending-resistant optical fiber.

Background technique

With the rapid development of fiber-to-the-home and fiber-to-the-desktop technologies, the construction of optical networks is accelerating. At present, the most widely used in the optical fiber access network is the low water peak optical fiber, and its bending radius is generally recommended to be about 30mm. However, in actual use, the bending radius of the optical fiber by users or construction personnel is often smaller than the recommended value, so the optical fiber often breaks, that is to say, the bending resistance of the optical fiber is not ideal.

Contents of the invention

In order to solve the above problems, the object of the present invention is to disclose a bend-resistant optical fiber, which can still maintain good optical, mechanical and ambient temperature performances at a relatively low bending radius, which is realized by the following technical solutions.

In Embodiment 1 of the present invention, a bend-resistant optical fiber includes a core 1, a cladding 2 outside the core, a coating 3 outside the cladding, and a coating outside the coating. The coloring layer 5 is characterized in that: there is an anti-bending outer layer 4 between the coating layer and the coloring layer; the diameter of the cladding is 123-127 μm, the core/cladding concentricity error is ≤0.6 μm, and the cladding is not Roundness ≤ 1.0%, the diameter of the coating layer is 210-230 μm, the diameter of the anti-bending outer layer is 225-245 μm, and the diameter of the colored layer is 240-260 μm; the bending-resistant optical fiber is loosely wound 100 times with a bending radius of 30 mm , the additional attenuation of 1310nm wavelength≤0.05dB/Km, the additional attenuation of 1383nm wavelength≤0.05dB/Km, the additional attenuation of 1550nm wavelength≤0.1dB/Km, the additional attenuation of 1625nm wavelength≤0.1dB/Km; Bending the optical fiber, the bending-resistant optical fiber does not break after passing both ends of the bending-resistant optical fiber in the same direction through a cylindrical hole with an inner diameter of 2 mm; in the bending-resistant optical fiber, the refractive index of the core > the refractive index of the cladding >Refractive index of the coating layer>Refractive index of the anti-bending outer layer; the anti-bending outer layer is composed of the following raw materials in parts by weight:

Acrylamidoethyl 2-aminopropyltriethoxysilane or acrylamidopropyltriethoxysilane: 15-25 parts;

Acrylic silicone resin: 15-35 parts;

Acrylic epoxy resin: 15-35 parts;

Acrylic polyurethane resin: 15-25 parts;

2-Hydroxy-methyl-propiophenone: 1 to 2 parts;

Isopropyl tris (dioctyl phosphate acyloxy) titanate: 2 to 5 parts;

The colored layer is composed of the following raw materials in parts by weight: optical fiber coloring ink: 98-100 parts; isopropyl tris(dioctyl phosphate acyloxy) titanate: 1-2 parts; isopropyl Tris(dioctylpyrophosphate acyloxy) titanate: 0.5-1.5 parts.

In Embodiment 2 of the present invention, a bend-resistant optical fiber includes a core 1, a cladding 2 outside the core, a coating 3 outside the cladding, and a coating outside the coating. The colored layer 5 is characterized in that: there is an anti-bending inner layer 10 between the core and the cladding; the diameter of the cladding is 123-127 μm, the concentricity error of the core/cladding is ≤0.6 μm, and the cladding is not round degree ≤ 1.0%, the diameter of the coating layer is 235-250 μm, the diameter of the anti-bending inner layer is 8.5-20 μm, and the diameter of the colored layer is 240-260 μm; after the bending-resistant optical fiber is loosely wound 100 times with a bending radius of 30 mm, The additional attenuation of 1310nm wavelength≤0.05dB/Km, the additional attenuation of 1383nm wavelength≤0.05dB/Km, the additional attenuation of 1550nm wavelength≤0.1dB/Km, the additional attenuation of 1625nm wavelength≤0.1dB/Km; any length of bending resistance not less than 10cm Bending optical fiber, the bending-resistant optical fiber does not break after passing both ends of the bending-resistant optical fiber in the same direction through a cylindrical hole with an inner diameter of 2 mm; in the bending-resistant optical fiber, the refractive index of the core > the bending-resistant inner layer Refractive index>refractive index of the cladding layer>refractive index of the coating layer; the anti-bending inner layer is composed of the following raw materials in parts by weight:

Acrylamidoethyl 2-aminopropyltriethoxysilane or acrylamidopropyltriethoxysilane: 15-25 parts;

Acrylic silicone resin: 15-35 parts;

Acrylic epoxy resin: 15-35 parts;

Acrylic polyurethane resin: 15-25 parts;

2-Hydroxy-methyl-propiophenone: 1 to 2 parts;

Isopropyl tris (dioctyl phosphate acyloxy) titanate: 2 to 5 parts;

The colored layer is composed of the following raw materials in parts by weight: optical fiber coloring ink: 98-100 parts; isopropyl tris(dioctyl phosphate acyloxy) titanate: 1-2 parts; isopropyl Tris(dioctylpyrophosphate acyloxy) titanate: 0.5-1.5 parts.

In Embodiment 3 of the present invention, a bend-resistant optical fiber includes a core 1, a cladding 2 outside the core, a coating 3 outside the cladding, and a coating outside the coating. The colored layer 5 is characterized in that there is an anti-bending outer layer 4 between the coating layer and the colored layer, and an anti-bending inner layer 10 between the core and the cladding; the diameter of the cladding is 123-127 μm , core/cladding concentricity error≤0.6μm, cladding out-of-roundness≤1.0%, coating layer diameter is 210-230μm; anti-bending inner layer diameter is 8.5-20μm; anti-bending outer layer diameter is 225 ～245μm; the diameter of the colored layer is 240～260μm; after the bend-resistant optical fiber is loosely wound 100 times with a bending radius of 30mm, the additional attenuation of 1310nm wavelength is ≤0.05dB/Km, the additional attenuation of 1383nm wavelength is ≤0.05dB/Km, and the wavelength of 1550nm Additional attenuation ≤ 0.1dB/Km, 1625nm wavelength additional attenuation ≤ 0.1dB/Km; Take any bend-resistant optical fiber with a length of not less than 10cm, and pass both ends of the bend-resistant optical fiber in the same direction through a cylindrical hole with an inner diameter of 2mm Afterwards, the bending-resistant optical fiber does not break; in the bending-resistant optical fiber, the refractive index of the core > the refractive index of the bending-resistant inner layer > the refractive index of the cladding > the refractive index of the coating layer > the refractive index of the bending-resistant outer layer Refractive index; the anti-bending inner layer and the anti-bending outer layer are all composed of the following raw materials in parts by weight:

Acrylamidoethyl 2-aminopropyltriethoxysilane or acrylamidopropyltriethoxysilane: 15-25 parts;

Acrylic silicone resin: 15-35 parts;

Acrylic epoxy resin: 15-35 parts;

Acrylic polyurethane resin: 15-25 parts;

2-Hydroxy-methyl-propiophenone: 1 to 2 parts;

Isopropyl tris (dioctyl phosphate acyloxy) titanate: 2 to 5 parts;

The colored layer is composed of the following raw materials in parts by weight: optical fiber coloring ink: 98-100 parts; isopropyl tris(dioctyl phosphate acyloxy) titanate: 1-2 parts; isopropyl Tris(dioctylpyrophosphate acyloxy) titanate: 0.5-1.5 parts.

In the present invention, due to the anti-bending inner layer or the outer layer of anti-bending or both the inner layer of anti-bending and the outer layer of anti-bending, and the inner layer of anti-bending and the outer layer of anti-bending are extremely flexible Therefore, the optical fiber is effectively protected, so that the optical fiber can achieve an extremely ideal bending resistance when it is bent with a small diameter; And the ductility is higher, and in the case of repeated bending/bending, there is no cracking of the colored layer, which provides a further guarantee for the bending resistance of the optical fiber.

The invention has been tested, except that all optical indicators meet the requirements of ITU, IEC and domestic optical fiber standards, and it can take any bending-resistant optical fiber with a length of not less than 10cm, and pass both ends of the bending-resistant optical fiber in the same direction at the same time with an inner diameter of 2mm. The aim of the bending-resistant optical fiber behind the cylindrical hole is not to break. Therefore, the construction personnel no longer have to worry about the optical fiber being easily broken during construction, and the construction is more convenient; moreover, the application range of the optical fiber is greatly expanded and the use of the optical fiber is reduced. Require.

Therefore, the present invention has the following main beneficial effects: simple structure, easy realization, excellent folding resistance, wider application range, and lower bending requirements during construction.

Description of drawings

Fig. 1 is a schematic diagram of the cross-sectional structure of Embodiment 1 of the present invention.

Fig. 2 is a schematic diagram of the cross-sectional structure of Embodiment 2 of the present invention.

Fig. 3 is a schematic diagram of the cross-sectional structure of Embodiment 4 of the present invention.

detailed description

Implementation Example 1

A bend-resistant optical fiber comprising a core 1, a cladding 2 outside the core, a coating 3 outside the cladding, and a colored layer 5 outside the coating, characterized in that: There is an anti-bending outer layer 4 between the coating layer and the colored layer; the cladding diameter is 123-127 μm, the core/cladding concentricity error is ≤0.6 μm, and the cladding out-of-roundness is ≤1.0%. The diameter of the layer is 210-230 μm, the diameter of the anti-bending outer layer is 225-245 μm, and the diameter of the colored layer is 240-260 μm; after the bending-resistant optical fiber is loosely wound 100 times with a bending radius of 30 mm, the additional attenuation of 1310 nm wavelength is ≤0.05 dB /Km, the additional attenuation of 1383nm wavelength≤0.05dB/Km, the additional attenuation of 1550nm wavelength≤0.1dB/Km, the additional attenuation of 1625nm wavelength≤0.1dB/Km; take any bending-resistant optical fiber with a length of not less than 10cm, and the bending-resistant Both ends of the optical fiber pass through a cylindrical hole with an inner diameter of 2 mm at the same time and the bending-resistant optical fiber does not break; in the bending-resistant optical fiber, the refractive index of the core > the refractive index of the cladding > the refractive index of the coating > The refractive index of the anti-bending outer layer; the anti-bending outer layer is composed of the following raw materials in parts by weight:

Acrylamidoethyl 2-aminopropyltriethoxysilane or acrylamidopropyltriethoxysilane: 15-25 parts;

Acrylic silicone resin: 15-35 parts;

Acrylic epoxy resin: 15-35 parts;

Acrylic polyurethane resin: 15-25 parts;

2-Hydroxy-methyl-propiophenone: 1 to 2 parts;

Isopropyl tris (dioctyl phosphate acyloxy) titanate: 2 to 5 parts;

The colored layer is composed of the following raw materials in parts by weight: optical fiber coloring ink: 98-100 parts; isopropyl tris(dioctyl phosphate acyloxy) titanate: 1-2 parts; isopropyl Tris(dioctylpyrophosphate acyloxy) titanate: 0.5-1.5 parts.

After repeated tests by the applicant, it is found that the anti-bending outer layer has the best effect when it is composed of the following raw materials in terms of parts by weight:

Acrylamidoethyl 2-aminopropyltriethoxysilane or acrylamidopropyltriethoxysilane: 20 parts;

Acrylic silicone resin: 30 parts;

Acrylic epoxy resin: 30 parts;

Acrylic polyurethane resin: 20 parts;

2-Hydroxy-methyl-propiophenone: 1.5 parts;

Isopropyl tri(dioctyl phosphate acyloxy) titanate: 4 parts;

The coloring layer has the best effect when it is composed of the following raw materials in parts by weight: optical fiber coloring ink: 99 parts; isopropyl tris(dioctyl phosphate acyloxy) titanate: 1.5 parts; isopropyl tris( Dioctyl pyrophosphate acyloxy) titanate: 1 part.

Implementation Example 2

A bend-resistant optical fiber comprising a core 1, a cladding 2 outside the core, a coating 3 outside the cladding, and a colored layer 5 outside the coating, characterized in that: There is also a bending-resistant inner layer 10 between the core and the cladding; the diameter of the cladding is 123-127 μm, the concentricity error of the core/cladding is ≤0.6 μm, the out-of-roundness of the cladding is ≤1.0%, and the coating layer The diameter is 235-250 μm, the diameter of the anti-bending inner layer is 8.5-20 μm, and the diameter of the colored layer is 240-260 μm; after the bending-resistant optical fiber is loosely wound 100 times with a bending radius of 30 mm, the additional attenuation of 1310nm wavelength is ≤0.05dB/ Km, 1383nm wavelength additional attenuation ≤ 0.05dB/Km, 1550nm wavelength additional attenuation ≤ 0.1dB/Km, 1625nm wavelength additional attenuation ≤ 0.1dB/Km; any bend-resistant fiber with a length of not less than 10cm is taken, and the bend-resistant fiber The bending-resistant optical fiber does not break after both ends pass through a cylindrical hole with an inner diameter of 2 mm at the same time; in the bending-resistant optical fiber, the refractive index of the core > the refractive index of the anti-bending inner layer > the refractive index of the cladding >The refractive index of the coating layer; the anti-bending inner layer is composed of the following raw materials in parts by weight:

Acrylamidoethyl 2-aminopropyltriethoxysilane or acrylamidopropyltriethoxysilane: 15-25 parts;

Acrylic silicone resin: 15-35 parts;

Acrylic epoxy resin: 15-35 parts;

Acrylic polyurethane resin: 15-25 parts;

2-Hydroxy-methyl-propiophenone: 1 to 2 parts;

Isopropyl tris (dioctyl phosphate acyloxy) titanate: 2 to 5 parts;

The colored layer is composed of the following raw materials in parts by weight: optical fiber coloring ink: 98-100 parts; isopropyl tris(dioctyl phosphate acyloxy) titanate: 1-2 parts; isopropyl Tris(dioctylpyrophosphate acyloxy) titanate: 0.5-1.5 parts.

After repeated tests by the applicant, it is found that the anti-bending inner layer is best when it is composed of the following raw materials in parts by weight:

Acrylamidoethyl 2-aminopropyltriethoxysilane or acrylamidopropyltriethoxysilane: 20 parts;

Acrylic silicone resin: 30 parts;

Acrylic epoxy resin: 30 parts;

Acrylic polyurethane resin: 20 parts;

2-Hydroxy-methyl-propiophenone: 1.5 parts;

Isopropyl tri(dioctyl phosphate acyloxy) titanate: 4 parts;

The coloring layer has the best effect when it is composed of the following raw materials in parts by weight: optical fiber coloring ink: 99 parts; isopropyl tris(dioctyl phosphate acyloxy) titanate: 1.5 parts; isopropyl tris( Dioctyl pyrophosphate acyloxy) titanate: 1 part.

Implementation Example 3

A bend-resistant optical fiber comprising a core 1, a cladding 2 outside the core, a coating 3 outside the cladding, and a colored layer 5 outside the coating, characterized in that: There is an anti-bending outer layer 4 between the coating layer and the colored layer, and an anti-bending inner layer 10 between the core and the cladding; the diameter of the cladding is 123-127 μm, and the core/cladding concentricity Error ≤ 0.6 μm, cladding out of roundness ≤ 1.0%, coating layer diameter is 210-230 μm; anti-bending inner layer diameter is 8.5-20 μm; anti-bending outer layer diameter is 225-245 μm; coloring layer diameter is 240 ~260μm; after the bend-resistant optical fiber is loosely wound 100 times with a bending radius of 30mm, the additional attenuation of 1310nm wavelength is ≤0.05dB/Km, the additional attenuation of 1383nm wavelength is ≤0.05dB/Km, and the additional attenuation of 1550nm wavelength is ≤0.1dB/Km, 1625nm wavelength additional attenuation ≤ 0.1dB/Km; Take any bend-resistant optical fiber with a length of not less than 10cm, and pass both ends of the bend-resistant optical fiber in the same direction at the same time through a cylindrical hole with an inner diameter of 2mm, and the bend-resistant optical fiber will not break; In the bending-resistant optical fiber, the refractive index of the core>the refractive index of the bending-resistant inner layer>the refractive index of the cladding>the refractive index of the coating layer>the refractive index of the bending-resistant outer layer; The inner layer and the anti-bending outer layer are composed of the following raw materials in parts by weight:

Acrylamidoethyl 2-aminopropyltriethoxysilane or acrylamidopropyltriethoxysilane: 15-25 parts;

Acrylic silicone resin: 15-35 parts;

Acrylic epoxy resin: 15-35 parts;

Acrylic polyurethane resin: 15-25 parts;

2-Hydroxy-methyl-propiophenone: 1 to 2 parts;

Isopropyl tris (dioctyl phosphate acyloxy) titanate: 2 to 5 parts;

The colored layer is composed of the following raw materials in parts by weight: optical fiber coloring ink: 98-100 parts; isopropyl tris(dioctyl phosphate acyloxy) titanate: 1-2 parts; isopropyl Tris(dioctylpyrophosphate acyloxy) titanate: 0.5-1.5 parts.

After repeated tests by the applicant, it is found that the bending-resistant inner layer and the bending-resistant outer layer are the best when they are composed of the following raw materials in parts by weight:

Acrylamidoethyl 2-aminopropyltriethoxysilane or acrylamidopropyltriethoxysilane: 20 parts;

Acrylic silicone resin: 30 parts;

Acrylic epoxy resin: 30 parts;

Acrylic polyurethane resin: 20 parts;

2-Hydroxy-methyl-propiophenone: 1.5 parts;

Isopropyl tri(dioctyl phosphate acyloxy) titanate: 4 parts;

The coloring layer has the best effect when it is composed of the following raw materials in parts by weight: optical fiber coloring ink: 99 parts; isopropyl tris(dioctyl phosphate acyloxy) titanate: 1.5 parts; isopropyl tris( Dioctyl pyrophosphate acyloxy) titanate: 1 part.

In addition, the applicant found that the following formulations are also ideal formulations:

Formula 1: The anti-bending inner layer and the anti-bending outer layer are composed of the following raw materials in parts by weight: acrylamidoethyl 2-aminopropyltriethoxysilane or acrylamidopropyltriethoxy Silane: 15 parts;

Acrylic silicone resin: 15 parts;

Acrylic epoxy resin: 15 parts;

Acrylic polyurethane resin: 15 parts;

2-Hydroxy-methyl-propiophenone: 1 part;

Isopropyl tri(dioctyl phosphate acyloxy) titanate: 2 parts;

The colored layer is composed of the following raw materials in parts by weight: optical fiber coloring ink: 98-100 parts; isopropyl tris(dioctyl phosphate acyloxy) titanate: 1 part; isopropyl tris( Dioctyl pyrophosphate acyloxy) titanate: 0.5 parts.

Formula 2: The anti-bending inner layer and the anti-bending outer layer are composed of the following raw materials in parts by weight: acrylamidoethyl 2-aminopropyltriethoxysilane or acrylamidopropyltriethoxy Silane: 25 parts;

Acrylic silicone resin: 35 parts;

Acrylic epoxy resin: 35 parts;

Acrylic polyurethane resin: 25 parts;

2-Hydroxy-methyl-propiophenone: 2 parts;

Isopropyl tri(dioctyl phosphate acyloxy) titanate: 5 parts;

The colored layer is composed of the following raw materials in parts by weight: optical fiber coloring ink: 98-100 parts; isopropyl tris(dioctyl phosphate acyloxy) titanate: 2 parts; isopropyl tris( Dioctyl pyrophosphate acyloxy) titanate: 1.5 parts.

Formula 1 and formula 2 also achieved ideal bending resistance.

The applicant compared the folding resistance of the optical fiber in the above-mentioned implementation example of the present invention with that of the optical fiber in the prior art, and 500 optical fibers in each implementation example and the prior art were taken as sample tests, and the following table is not marked The range is the average value. For the convenience of description, the implementation examples 1-3 are respectively marked as 1#-3#, G.652B in the prior art is 4#, G.652D is 5#, G657A2 is 6#, G657B3 It is 7#, and the test results are as follows, where "√" means that the fiber is not broken, and "X" means that the fiber is broken; whether it is broken or not, it can be tested by optical time domain reflectometer (OTDR) and visible light power meter.

Therefore, it is apparent that the optical fiber of the present invention has excellent bending resistance.

In addition, the applicant also used the coloring ink in the prior art for coloring to form a coloring layer, and compared the folding resistance of the folding-resistant optical fiber coloring with the coloring layer formula in the present invention, and obtained the following data. The coloring ink of prior art and three embodiment coloring layers in the present invention all had the optical fiber of 200 disks 25.2 kilometers; Corresponding optical fibers placed with coloring oil in the prior art are respectively marked as 11#-33#; each sample is worn 10 times in each implementation example; and under the condition of a load of 10N, a 100-turn bending test is carried out; the optical fiber breaks Use OTDR or visible light power meter to test.

Therefore, in this application, the formulation of the colored layer also contributes to the folding performance of the optical fiber.

In the present invention, due to the anti-bending inner layer or the outer layer of anti-bending or both the inner layer of anti-bending and the outer layer of anti-bending, and the inner layer of anti-bending and the outer layer of anti-bending are extremely flexible Therefore, the optical fiber is effectively protected, so that the optical fiber can achieve an extremely ideal bending resistance when it is bent with a small diameter; And the ductility is higher, and in the case of repeated bending/bending, there is no cracking of the colored layer, which provides a further guarantee for the bending resistance of the optical fiber.

The invention has been tested, except that all optical indicators meet the requirements of ITU, IEC and domestic optical fiber standards, and it can take any bending-resistant optical fiber with a length of not less than 10cm, and pass both ends of the bending-resistant optical fiber in the same direction at the same time with an inner diameter of 2mm. The aim of the bending-resistant optical fiber behind the cylindrical hole is not to break. Therefore, the construction personnel no longer have to worry about the optical fiber being easily broken during construction, and the construction is more convenient; moreover, the application range of the optical fiber is greatly expanded and the use of the optical fiber is reduced. Require.

Therefore, the present invention has the following main beneficial effects: simple structure, easy realization, excellent folding resistance, wider application range, and lower bending requirements during construction.

Claims (2)

1. A bend-resistant optical fiber, which includes a core, a cladding outside the core, a coating outside the cladding, and a colored layer outside the coating, characterized in that: There is an anti-bending outer layer between the layer and the colored layer; the cladding diameter is 123-127 μm, the core/cladding concentricity error is ≤0.6 μm, the cladding out-of-roundness is ≤1.0%, and the coating layer diameter is 210-230 μm, the diameter of the anti-bending outer layer is 225-245 μm, and the diameter of the colored layer is 240-260 μm; after the bending-resistant optical fiber is loosely wound 100 times with a bending radius of 30 mm, the additional attenuation of 1310nm wavelength is ≤0.05dB/Km, The additional attenuation of 1383nm wavelength≤0.05dB/Km, the additional attenuation of 1550nm wavelength≤0.1dB/Km, the additional attenuation of 1625nm wavelength≤0.1dB/Km; take a bend-resistant fiber with a length of not less than 10cm, and connect the two ends of the bend-resistant fiber At the same time, the bending-resistant optical fiber does not break after passing through a cylindrical hole with an inner diameter of 2 mm in the same direction; in the bending-resistant optical fiber, the refractive index of the core > the refractive index of the cladding > the refractive index of the coating > the bending resistance The refractive index of the outer layer; the anti-bending outer layer is composed of the following raw materials in parts by weight: Acrylamidoethyl 2-aminopropyltriethoxysilane or acrylamidopropyltriethoxysilane: 15-25 parts; Acrylic silicone resin: 15-35 parts; Acrylic epoxy resin: 15-35 parts; Acrylic polyurethane resin: 15-25 parts; 2-Hydroxy-methyl-propiophenone: 1 to 2 parts; Isopropyl tris (dioctyl phosphate acyloxy) titanate: 2 to 5 parts; The colored layer is composed of the following raw materials in parts by weight: optical fiber coloring ink: 98-100 parts; isopropyl tris(dioctyl phosphate acyloxy) titanate: 1-2 parts; isopropyl Tris(dioctylpyrophosphate acyloxy) titanate: 0.5-1.5 parts. 2. A bending-resistant optical fiber according to claim 1, wherein the bending-resistant outer layer is composed of the following raw materials in parts by weight: Acrylamidoethyl 2-aminopropyltriethoxysilane or acrylamidopropyltriethoxysilane: 20 parts; Acrylic silicone resin: 30 parts; Acrylic epoxy resin: 30 parts; Acrylic polyurethane resin: 20 parts; 2-Hydroxy-methyl-propiophenone: 1.5 parts; Isopropyl tri(dioctyl phosphate acyloxy) titanate: 4 parts; The colored layer is composed of the following raw materials in parts by weight: optical fiber coloring ink: 99 parts; isopropyl tris(dioctyl phosphate acyloxy) titanate: 1.5 parts; Phosphate (acyloxy) titanate: 1 part.