CN108761680B - Double-layer tight-sleeve phase-stable optical cable and preparation method thereof - Google Patents
Double-layer tight-sleeve phase-stable optical cable and preparation method thereof Download PDFInfo
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- 239000013307 optical fiber Substances 0.000 claims abstract description 99
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- XRASRVJYOMVDNP-UHFFFAOYSA-N 4-(7-azabicyclo[4.1.0]hepta-1,3,5-triene-7-carbonyl)benzamide Chemical compound C1=CC(C(=O)N)=CC=C1C(=O)N1C2=CC=CC=C21 XRASRVJYOMVDNP-UHFFFAOYSA-N 0.000 claims description 7
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
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- G—PHYSICS
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- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
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Abstract
The invention discloses a double-layer tight-sleeve phase-stabilizing optical cable and a preparation method thereof, wherein the phase-stabilizing optical cable sequentially comprises an optical fiber, a first tight-sleeve layer and a second tight-sleeve layer from inside to outside, the stripping force of the first tight-sleeve layer and the optical fiber is between 2N and 9N, the first tight-sleeve layer and the optical fiber are molecular oriented LCP materials, the thickness of the first tight-sleeve layer is between 0.05mm and 0.3mm, the elastic modulus of the first tight-sleeve layer is between 10GPa and 13GPa, and the thermal expansion coefficient of the first tight-sleeve layer is-1 to 1 × 10‑7and/K. The method comprises the following steps: (1) first extrusion molding: performing extrusion molding on the optical fiber and the first tight-jacketed material through an extruding machine to obtain a one-time extrusion phase-stabilized optical cable; (2) and (3) performing secondary extrusion molding, namely performing extrusion molding on the primary extrusion molding phase-stabilized optical cable and the second tight-sleeved layer material through an extruding machine to obtain the double-layer tight-sleeved phase-stabilized optical cable. The temperature stability in a wider range is greatly increased, so that the transmission accuracy of phase deviation to signals is improved, and the method can be applied to the fields of radars and the like.
Description
Technical Field
The invention belongs to the technical field of special optical cables, and particularly relates to a double-layer tight-sleeve phase-stable optical cable and a preparation method thereof.
Background
The optical path difference of the conventional optical fiber cable product can change along with the temperature change. This variation is mainly caused by thermal expansion and contraction of the optical fiber and by the change in the optical refractive index of the glass core. The temperature drift coefficient of the conventional optical fiber is (40Ps/km/K), and the optical path difference changes to cause phase shift in the optical transmission process.
In some fields requiring high precision, such as radar application fields, the phase shift has a large influence on the precise transmission of signals, so that there are many urgent demands for phase-stable optical cables. The conventional tight-buffered optical fiber has the problem that the optical path difference fluctuates greatly along with the temperature change, the typical value of the temperature drift coefficient of the conventional tight-buffered product is in the range of 40-60 Ps/km/K, even in a larger range, and the additional attenuation is larger when the conventional tight-buffered optical fiber is used in a high-temperature and low-temperature environment, so that the mechanical property of the optical fiber is weakened.
Disclosure of Invention
Aiming at the defects or the improvement requirements of the prior art, the invention provides a double-layer tight-sleeved phase-stabilizing optical cable and a preparation method thereof, aiming at optimizing the material and the performance of each tight-sleeved layer through a double-layer tight-sleeved structure, thereby solving the technical problems of higher temperature drift coefficient, larger additional attenuation or the like of the conventional phase-stabilizing optical cable.
In order to achieve the purpose, according to one aspect of the invention, the double-layer tight-buffered phase-stable optical cable comprises an optical fiber, a first tight-buffered layer and a second tight-buffered layer from inside to outside in sequence, wherein the stripping force of the first tight-buffered layer and the optical fiber is between 2N and 9N, the first tight-buffered layer and the optical fiber are made of LCP materials with molecular orientation arrangement, the thickness of the LCP materials is between 0.05mm and 0.3mm, the elastic modulus of the LCP materials is between 10GPa and 13GPa, and the thermal expansion coefficient of the LCP materials is-1 to 1 × 10-7/K。
Preferably, the first tight-buffered layer of the double-layer tight-buffered phase-stabilized optical cable is poly-p-phenylene terephthalamide, and the melt flow index is between 15 and 35, preferably between 17 and 26.
Preferably, the second tight-buffered phase-stabilized optical cable has a second tight-buffered layer of ethylene tetrafluoroethylene copolymer, a melt flow index of 10 to 25, a thickness of 0.05mm to 0.15mm, and a peel force from the first tight-buffered layer of 0.8N to 6N.
Preferably, the second tight-buffered layer deformation rate of the double-layer tight-buffered phase-stabilized optical cable is greater than 400%.
According to another aspect of the invention, the preparation method of the double-layer tight-buffered phase-stable optical cable is provided, and comprises the following steps:
(1) first extrusion molding: performing extrusion molding on the optical fiber and the first tight-jacketed material through an extruding machine to obtain a one-time extrusion phase-stabilized optical cable;
(2) and (3) performing secondary extrusion molding, namely performing extrusion molding on the primary extrusion molding phase-stabilized optical cable obtained in the step (1) and the second tight-sleeved layer material through an extruding machine to obtain the double-layer tight-sleeved phase-stabilized optical cable.
Preferably, the preparation method of the double-layer tight-buffered phase-stabilized optical cable comprises the following steps (1):
(1-1) carrying out pre-baking treatment on the first tight sleeve material, and preheating the optical fiber;
(1-2) injecting the prebaked first jacket material obtained in the step (1-1) into an extrusion mold, and extruding the same together with the preheated optical fiber through the extruder;
(1-3) air-cooling the optical fiber with the first tight-buffered layer obtained by extrusion molding in the step (1-2).
Preferably, in the preparation method of the double-layer tight-buffered phase-stabilized optical cable, the preheating temperature of the optical fiber in the step (1-1) is 230-280 ℃, and the preheating time is 1-3 s.
Preferably, in the preparation method of the double-layer tight-buffered phase-stabilized optical cable, the material of the first tight-buffered layer is phenylene terephthalamide, and the melt flow index is 15-35, preferably 17-26;
the pre-drying temperature of the first tight sheathing material in the step (1-1) is 100-150 ℃, and the pre-drying time is 6-15 h;
in the step (1-2), the temperature of an extrusion molding outlet is 320-400 ℃, and the production speed is 150-250 m/min;
step (1-3) air-cooling to 20 ℃ to 50 ℃.
Preferably, the method for preparing the double-layer tight-buffered phase-stabilized optical cable comprises the following step (2):
(2-1) carrying out pre-baking treatment on the second tight-sleeved layer material;
(2-2) injecting the pre-baked second tight-buffered material obtained in the step (2-1) into an extrusion mold, and extruding the second tight-buffered material and the primary extrusion phase-stabilized optical cable obtained in the step (1) through an extruder;
and (2-3) carrying out air cooling take-up on the optical fiber with the double tight-sleeved layers obtained in the step (2-2) by extrusion molding.
Preferably, in the preparation method of the double-layer tight-buffered phase-stabilized optical cable, the material of the second tight-buffered layer is ethylene tetrafluoroethylene copolymer, and the melt flow index is between 10 and 25;
the pre-drying temperature of the second tight sheathing material in the step (2-1) is 40-100 ℃, and the pre-drying time is 3-8 h;
the temperature of an extrusion molding outlet in the step (2-2) is 310-350 ℃, and the production speed is 20-60 m/min;
and (3) cooling the air to 20-50 ℃, and taking up the wire under the tension of 0.6-2.0N.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
according to the double-layer tight-sleeved phase-stable optical cable provided by the invention, the material physical and chemical properties of the first tight-sleeved layer are optimized, particularly the elastic modulus and the thermal expansion coefficient are optimized, and the geometric dimension is optimized, so that the peeling force between the first tight-sleeved layer and the optical fiber is optimized, the temperature drift coefficient of the optical cable can be reduced, the temperature drift coefficient reaches 5-10 Ps/km/K control, and compared with about 40-60 Ps/km/K of the conventional tight-sleeved optical fiber, the temperature stability in a wider range is greatly increased, the transmission accuracy of phase shift to signals is improved, and the double-layer tight-sleeved phase-stable optical cable can be applied to the fields of radars and the like.
According to the preferred scheme, through material physical and chemical property selection and geometric parameter optimization of the first tight sleeve layer and the second tight sleeve layer, the temperature drift coefficient of the optical cable can be reduced, light attenuation is reduced, the mechanical property is improved, the application requirement is further met, the service life is prolonged, the structural durability of the double-layer tight sleeve material is improved, and the appearance is attractive; the product has small outer diameter and convenient use.
The preparation method of the double-layer tight-sleeved phase-stable optical cable provided by the invention can improve the combination stability between the first tight-sleeved layer and the optical fiber and between the first tight-sleeved layer and the second tight-sleeved layer and the geometric dimension consistency of material forming, thereby improving the performance and yield of the optical fiber.
Drawings
FIG. 1 is a schematic structural diagram of a double-layer tight-buffered phase-stabilized optical cable provided by the present invention;
FIG. 2 is a graph comparing the temperature drift coefficient of the phase-stabilized cable provided in example 1 of the present invention with that of a conventional G652D fiber.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The invention provides a double-layer tight-sleeve phase-stabilizing optical cable, which sequentially comprises the following components from inside to outside: the optical fiber, the first tight-buffered layer and the second tight-buffered layer.
The first tight-buffered layer and the optical fiber have the stripping force of 2N to 9N, are LCP materials with molecular orientation arrangement, have the thickness of 0.05mm to 0.3mm, the elastic modulus of 10 to 13GPa and the thermal expansion coefficient of-1 to 1 × 10-7and/K. Preferably, the first tight-buffered layer is poly-p-phenylene terephthalamide with a melt flow index between 15 and 35, preferably between 17 and 26.
The second tight-buffered layer is ethylene tetrafluoroethylene copolymer, the melt flow index is between 10 and 25, the thickness is between 0.05mm and 0.15mm, and the stripping force of the second tight-buffered layer and the first tight-buffered layer is between 0.8N and 6N. The second cuff layer deformation rate is greater than or equal to 400%.
The double-layer tight-sleeve phase-stabilizing optical cable provided by the invention aims at the problem that the optical path difference of the existing optical cable fluctuates greatly along with the temperature change, and the first tight-sleeve layer is adopted, so that the thermal expansion coefficient of the optical cable is very small relative to that of the optical fiber, the optical fiber can be stabilized, and the temperature drift coefficient of a product is reduced. To achieve this effect, the peel force between the LCP jacket layer and the fiber needs to be on the order of 2N to 9N. Therefore, the LCP material should not only be selected to have a thermal expansion coefficient and an elastic modulus that meet the requirements, but also be considered to have a tight bonding with the optical fiber.
Furthermore, if a layer of LCP tight-sleeved layer is used, the LCP material is directly exposed in the application environment, so that the LCP tight-sleeved layer is easy to age and break when in use; and the LCP material has poor mechanical property, so that the single-layer tight-sleeved layer has poor bending property. The invention adopts a double-layer tight sleeve structure, avoids the growth of micro-cracks of LCP, and keeps the temperature drift coefficient, attenuation and mechanical strength of the whole optical cable at the optimum to the maximum extent.
The invention provides a preparation method of a double-layer tight-sleeve phase-stable optical cable, which comprises the following steps:
(1) first extrusion molding: performing extrusion molding on the optical fiber and the first tight-jacketed material through an extruding machine to obtain a one-time extrusion phase-stabilized optical cable;
(1-1) carrying out pre-baking treatment on the first tight sleeve material, and preheating the optical fiber;
(1-2) injecting the prebaked first jacket material obtained in the step (1-1) into an extrusion mold, and extruding the same together with the preheated optical fiber through the extruder;
(1-3) air-cooling the optical fiber with the first tight-buffered layer obtained by extrusion molding in the step (1-2).
(2) Performing second extrusion molding, namely performing extrusion molding on the primary extrusion-molded phase-stable optical cable and the second tight-sleeved layer material obtained in the step (1) through an extruding machine to obtain the double-layer tight-sleeved phase-stable optical cable;
(2-1) carrying out pre-baking treatment on the second tight-sleeved layer material;
(2-2) injecting the pre-baked second tight-buffered material obtained in the step (2-1) into an extrusion mold, and extruding the second tight-buffered material and the primary extrusion phase-stabilized optical cable obtained in the step (1) through an extruder;
and (2-3) carrying out air cooling take-up on the optical fiber with the double tight-sleeved layers obtained in the step (2-2) by extrusion molding.
The following are examples:
the optical fiber used by the phase-stabilized optical cable provided by the invention can be a multimode or other special optical fiber quartz glass optical fiber, and the following G.652D optical fiber is taken as an example:
example 1
A double-layer tight-sleeve phase-stable optical cable sequentially comprises from inside to outside: the optical fiber comprises a G.652D optical fiber, a first tight-buffered layer and a second tight-buffered layer.
The first tight-buffered layer has a stripping force of 2N with respect to the optical fiber, is made of LCP material with molecular orientation arrangement, has a thickness of 0.05mm, an elastic modulus of 12.5GPa, and a thermal expansion coefficient of-1 × 10-7and/K. The first fasteningThe jacket layer is poly-p-phenylene terephthalamide with a melt flow index of 16.
The second tight-buffered layer is ethylene tetrafluoroethylene copolymer, the melt flow index is 10, the thickness is between 0.05mm, and the stripping force between the second tight-buffered layer and the first tight-buffered layer is between 6N. The second cuff layer deformation rate was 500%.
The double-layer tight-sleeved phase-stable optical cable is prepared by the following method:
(1) first extrusion molding: performing extrusion molding on the G.652D optical fiber and the first tight-buffered layer material by using an extruding machine to obtain a one-step extrusion phase-stabilized optical cable;
the preheating temperature of the optical fiber is 230-280 ℃, and the preheating time is 1-3 s
The first tight sleeve layer material is phenylene terephthalamide, and the melt flow index is 16;
(1-1) carrying out pre-baking treatment on the first tight sleeve material, and preheating the optical fiber; the pre-drying temperature is 100 ℃, and the pre-drying time is 6 hours;
(1-2) molding the pre-baked first tight-buffered layer material obtained in the step (1-1) by an extrusion molding device, and extruding the pre-baked first tight-buffered layer material and the preheated optical fiber together by an extruder; the temperature of the extrusion die outlet is 370 ℃, and the production speed is 80 m/min;
(1-3) air-cooling the optical fiber with the first tight-buffered layer extruded in the step (1-2) to 20 ℃ to 50 ℃.
(2) Performing second extrusion molding, namely performing extrusion molding on the primary extrusion-molded phase-stable optical cable and the second tight-sleeved layer material obtained in the step (1) through an extruding machine to obtain the double-layer tight-sleeved phase-stable optical cable;
(2-1) carrying out pre-baking treatment on the second tight-sleeved layer material; the second tight sleeve layer is made of ethylene tetrafluoroethylene copolymer, and the melt flow index is 12; the pre-drying temperature is 100 ℃, and the pre-drying time is 8 hours;
(2-2) performing extrusion molding on the pre-baked second tight-jacketed material obtained in the step (2-1) through an extrusion molding device, and performing extrusion molding on the second tight-jacketed material and the primary extrusion phase-stable optical cable obtained in the step (1) through an extrusion molding machine; the temperature of the mold outlet is 350 ℃, and the production speed is 20 m/min;
and (2-3) air-cooling and taking up the optical fiber with the double tight sleeve layers obtained by extrusion molding in the step (2-2) to 20-50 ℃, and taking up the optical fiber under the tension of 1.2N.
Example 2
A double-layer tight-sleeve phase-stable optical cable sequentially comprises from inside to outside: the optical fiber comprises a G.652D optical fiber, a first tight-buffered layer and a second tight-buffered layer.
The first tight-buffered layer has a stripping force with respect to the optical fiber of 3, is made of LCP material with molecular orientation arrangement, has a thickness of 0.1mm, an elastic modulus of 13GPa, and a thermal expansion coefficient of-0.2 × 10-7and/K. The first tight-buffered layer is poly-p-phenylene terephthalamide with a melt flow index of 26.
The second tight-buffered layer is ethylene tetrafluoroethylene copolymer, the melt flow index is 25, the thickness is 0.1mm, and the stripping force between the second tight-buffered layer and the first tight-buffered layer is 0.8N. The second cuff layer deformation rate was 400%.
The double-layer tight-sleeved phase-stable optical cable is prepared by the following method:
(1) first extrusion molding: performing extrusion molding on the G.652D optical fiber and the first tight-buffered layer material by using an extruding machine to obtain a one-step extrusion phase-stabilized optical cable;
the preheating temperature of the optical fiber is 230-280 ℃, and the preheating time is 1-3 s
The first tight-fit layer material is phenylene terephthalamide, and the melt flow index is 26;
(1-1) carrying out pre-baking treatment on the first tight sleeve material, and preheating the optical fiber; the pre-drying temperature is 150 ℃, and the pre-drying time is 10 hours;
(1-2) injecting the prebaked first jacket material obtained in the step (1-1) into an extrusion mold, and extruding the same together with the preheated optical fiber through the extruder; the temperature of an extrusion molding outlet is 350-380 ℃, and the production speed is 150 m/min;
(1-3) air-cooling the optical fiber with the first tight-buffered layer extruded in the step (1-2) to 20 ℃ to 50 ℃.
(2) Performing second extrusion molding, namely performing extrusion molding on the primary extrusion-molded phase-stable optical cable and the second tight-sleeved layer material obtained in the step (1) through an extruding machine to obtain the double-layer tight-sleeved phase-stable optical cable;
(2-1) carrying out pre-baking treatment on the second tight-sleeved layer material; the second tight sleeve layer is made of ethylene tetrafluoroethylene copolymer, and the melt flow index is 18; the pre-drying temperature is 80 ℃, and the pre-drying time is 7 hours;
(2-2) injecting the pre-baked second tight-buffered material obtained in the step (2-1) into an extrusion mold, and extruding the second tight-buffered material and the primary extrusion phase-stabilized optical cable obtained in the step (1) through an extruder; the temperature of the mold outlet is 350 ℃, and the production speed is 30 m/min;
and (2-3) air-cooling and taking up the optical fiber with the double tight sleeve layers obtained by extrusion molding in the step (2-2) to 20-50 ℃, and taking up the optical fiber under the tension of 1.0N.
Example 3
A double-layer tight-sleeve phase-stable optical cable sequentially comprises from inside to outside: the optical fiber comprises a G.652D optical fiber, a first tight-buffered layer and a second tight-buffered layer.
The first tight-buffered layer has a stripping force of 9N with respect to the optical fiber, is made of LCP material with molecular orientation arrangement, has a thickness of 0.3mm, an elastic modulus of 10GPa, and a thermal expansion coefficient of 1 × 10-7and/K. The first tight-buffered layer is poly-p-phenylene terephthalamide, and the melt flow index is 15.
The second tight-buffered layer is ethylene tetrafluoroethylene copolymer, the melt flow index is 25, the thickness is between 0.05mm, and the stripping force between the second tight-buffered layer and the first tight-buffered layer is between 6N. The second cuff layer deformation rate is 450%.
The double-layer tight-sleeved phase-stable optical cable is prepared by the following method:
(1) first extrusion molding: performing extrusion molding on the G.652D optical fiber and the first tight-buffered layer material by using an extruding machine to obtain a one-step extrusion phase-stabilized optical cable;
the preheating temperature of the optical fiber is 230-280 ℃, and the preheating time is 1-3 s
The first tight sleeve layer material is phenylene terephthalamide, and the melt flow index is 15;
(1-1) carrying out pre-baking treatment on the first tight sleeve material, and preheating the optical fiber; the pre-drying temperature is 140 ℃, and the pre-drying time is 15 h;
(1-2) injecting the prebaked first jacket material obtained in the step (1-1) into an extrusion mold, and extruding the same together with the preheated optical fiber through the extruder; the temperature of the extrusion molding outlet is 400 ℃, and the production speed is 150 m/min;
(1-3) air-cooling the optical fiber with the first tight-buffered layer extruded in the step (1-2) to 20 ℃ to 50 ℃.
(2) Performing second extrusion molding, namely performing extrusion molding on the primary extrusion-molded phase-stable optical cable and the second tight-sleeved layer material obtained in the step (1) through an extruding machine to obtain the double-layer tight-sleeved phase-stable optical cable;
(2-1) carrying out pre-baking treatment on the second tight-sleeved layer material; the second tight sleeve layer is made of ethylene tetrafluoroethylene copolymer, and the melt flow index is 25; the pre-drying temperature is 40 ℃, and the pre-drying time is 5 hours;
(2-2) injecting the pre-baked second tight-buffered material obtained in the step (2-1) into an extrusion mold, and extruding the second tight-buffered material and the primary extrusion phase-stabilized optical cable obtained in the step (1) through an extruder; the temperature of the mold outlet is 330 ℃, and the production speed is 60 m/min;
and (2-3) air-cooling and taking up the optical fiber with the double tight sleeve layers obtained by extrusion molding in the step (2-2) to 20-50 ℃, and taking up the optical fiber under 2.0N tension.
Example 4
A double-layer tight-sleeve phase-stable optical cable sequentially comprises from inside to outside: the optical fiber comprises a G.652D optical fiber, a first tight-buffered layer and a second tight-buffered layer.
The first tight-buffered layer has a stripping force of 7N, is made of LCP material with molecular orientation arrangement, has a thickness of 0.2mm, an elastic modulus of 11GPa, and a thermal expansion coefficient of 1 × 10-7and/K. The first tight-buffered layer is poly-p-phenylene terephthalamide with a melt flow index of 17.
The second tight-buffered layer is ethylene tetrafluoroethylene copolymer, the melt flow index is 14, the thickness is 0.15mm, and the stripping force of the second tight-buffered layer and the first tight-buffered layer is between 5.2N. The second cuff layer deformation rate was 400%.
The double-layer tight-sleeved phase-stable optical cable is prepared by the following method:
(1) first extrusion molding: performing extrusion molding on the G.652D optical fiber and the first tight-buffered layer material by using an extruding machine to obtain a one-step extrusion phase-stabilized optical cable;
the preheating temperature of the optical fiber is 230-280 ℃, and the preheating time is 1-3 s
The first tight sleeve layer material is phenylene terephthalamide, and the melt flow index is 17;
(1-1) carrying out pre-baking treatment on the first tight sleeve material, and preheating the optical fiber; the pre-drying temperature is 100 ℃, and the pre-drying time is 10 hours;
(1-2) injecting the prebaked first jacket material obtained in the step (1-1) into an extrusion mold, and extruding the same together with the preheated optical fiber through the extruder; the temperature of the extrusion die outlet is 320 ℃, and the production speed is 150 m/min;
(1-3) air-cooling the optical fiber with the first tight-buffered layer extruded in the step (1-2) to 20 ℃ to 50 ℃.
(2) Performing second extrusion molding, namely performing extrusion molding on the primary extrusion-molded phase-stable optical cable and the second tight-sleeved layer material obtained in the step (1) through an extruding machine to obtain the double-layer tight-sleeved phase-stable optical cable;
(2-1) carrying out pre-baking treatment on the second tight-sleeved layer material; the second tight sleeve layer is made of ethylene tetrafluoroethylene copolymer, and the melt flow index is 14; the pre-drying temperature is 80 ℃, and the pre-drying time is 3 hours;
(2-2) injecting the pre-baked second tight-buffered material obtained in the step (2-1) into an extrusion mold, and extruding the second tight-buffered material and the primary extrusion phase-stabilized optical cable obtained in the step (1) through an extruder; the mold outlet temperature is 310, and the production speed is 20 m/min;
and (2-3) air-cooling and taking up the optical fiber with the double tight sleeve layers obtained by extrusion molding in the step (2-2) to 20-50 ℃, and taking up the optical fiber under the tension of 0.6N.
Example 5
A double-layer tight-sleeve phase-stable optical cable sequentially comprises from inside to outside: the optical fiber comprises a G.652D optical fiber, a first tight-buffered layer and a second tight-buffered layer.
The stripping force of the first tight-buffered layer and the optical fiber is 9N, the first tight-buffered layer and the optical fiber are made of LCP materials with molecular orientation arrangement, the thickness is 0.1mm, the elastic modulus is 13GPa, and the thermal expansion coefficient is 0.1 × 10-7and/K. The first tight-buffered layer is poly-p-phenylene terephthalamide, and the melt flow index is 20.
The second tight-buffered layer is ethylene tetrafluoroethylene copolymer, the melt flow index is 21, the thickness is between 0.15mm, and the stripping force with the first tight-buffered layer is 4N. The second cuff layer deformation rate was 500%.
The double-layer tight-sleeved phase-stable optical cable is prepared by the following method:
(1) first extrusion molding: performing extrusion molding on the G.652D optical fiber and the first tight-buffered layer material by using an extruding machine to obtain a one-step extrusion phase-stabilized optical cable;
the preheating temperature of the optical fiber is 230-280 ℃, and the preheating time is 1-3 s
The first tight sleeve layer material is phenylene terephthalamide, and the melt flow index is 20;
(1-1) carrying out pre-baking treatment on the first tight sleeve material, and preheating the optical fiber; the pre-drying temperature is 120 ℃, and the pre-drying time is 6 hours;
(1-2) injecting the prebaked first jacket material obtained in the step (1-1) into an extrusion mold, and extruding the same together with the preheated optical fiber through the extruder; the temperature of the extrusion molding outlet is 400 ℃, and the production speed is 180 m/min;
(1-3) air-cooling the optical fiber with the first tight-buffered layer extruded in the step (1-2) to 20 ℃ to 50 ℃.
(2) Performing second extrusion molding, namely performing extrusion molding on the primary extrusion-molded phase-stable optical cable and the second tight-sleeved layer material obtained in the step (1) through an extruding machine to obtain the double-layer tight-sleeved phase-stable optical cable;
(2-1) carrying out pre-baking treatment on the second tight-sleeved layer material; the second tight sleeve layer is made of ethylene tetrafluoroethylene copolymer, and the melt flow index is 21; the pre-drying temperature is 40 ℃, and the pre-drying time is 8 hours;
(2-2) injecting the pre-baked second tight-buffered material obtained in the step (2-1) into an extrusion mold, and extruding the second tight-buffered material and the primary extrusion phase-stabilized optical cable obtained in the step (1) through an extruder; the temperature of the mold outlet is 350 ℃, and the production speed is 20 m/min;
and (2-3) air-cooling and taking up the optical fiber with the double tight sleeve layers obtained by extrusion molding in the step (2-2) to 20-50 ℃, and taking up the optical fiber under the tension of 0.6N.
In order to improve the tight combination between the first tight-buffered layer and the optical fiber, and between the first tight-buffered layer and the second tight-buffered layer, thereby further reducing the temperature drift coefficient of the optical cable, the material selection of the first tight-buffered layer and the second tight-buffered layer and the process selection of the extrusion molding are very critical. Theoretically, the material which achieves the physicochemical properties required by the invention can reduce the temperature drift coefficient of the optical cable to a certain extent. The first tight sleeve material and the second tight sleeve material adopted by the embodiment can reduce the temperature drift coefficient of the optical cable to an ideal degree and simultaneously are more optimized in mechanical property and geometric dimension. Meanwhile, the method provided by the embodiment optimizes the parameters of the secondary extrusion molding process aiming at the materials of the first tight sleeve layer and the second tight sleeve layer, so that the optical fiber and the first tight sleeve layer as well as the first tight sleeve layer and the second tight sleeve layer are tightly combined, thereby improving the stripping force, and mainly aiming at the temperature and the production speed of the outlet of the extrusion molding; the prebaking link is particularly added, so that molecules between the optical fiber and the first tight sleeving layer and between the first tight sleeving layer and the second tight sleeving layer are activated during one-time extrusion molding and two-time extrusion molding, intermolecular acting force of a certain degree can be formed, the stripping force is greatly improved, and the temperature drift coefficient is further reduced. Wherein to the extrusion molding of second time, the temperature and the tension that need control final receipts line be can make between optic fibre and the first tight jacket layer because the combination that the extrusion molding of first time formed does not receive serious influence, and the inseparable degree of combination between first tight jacket layer and the second tight jacket layer reaches the requirement simultaneously.
Example 6
The phase-stable cables obtained in examples 1 to 5 were evaluated for the properties shown in table 1:
testing the optical path difference of the product at different temperatures through the CD400 and a temperature cycle box, and calculating to obtain the average temperature drift coefficient of the product at-55-125 ℃;
attenuation at 1310nm and 1550nm, by the PK8000 test;
the optical path lengths of the double-layer tight-jacketed phase-stabilized optical cable prepared in the embodiment 1 at different temperature sections of the product are tested through a CD400 and a temperature cycle box, and a temperature sensitivity coefficient change curve of the product along with temperature within a range of-55-125 ℃ is obtained through calculation and data fitting, and a comparison curve of the product and a conventional G652D bare fiber is shown in FIG. 2. The phase-stable optical cable has the tensile strength of 30-60N, has excellent mechanical properties, can be used as an optical cable independently, and can also be used as an optical cable subunit for other purposes.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (11)
1. A double-layer tight-sleeved phase-stable optical cable is characterized by sequentially comprising an optical fiber, a first tight-sleeved layer and a second tight-sleeved layer from inside to outside, wherein the peeling force between the first tight-sleeved layer and the optical fiber is 2N-9N, the first tight-sleeved layer and the optical fiber are made of LCP materials with molecular orientation arrangement, the thickness is 0.05 mm-0.3 mm, the elastic modulus is 10 GPa-13 GPa, and the thermal expansion coefficient is-1 × 10-7And the melt flow index is between 15 and 35.
2. The dual-layer tight-buffered phase-stabilized optical cable of claim 1, wherein said first tight-buffered layer is poly-p-phenylene terephthalamide having a melt flow index of between 17 and 26.
3. The two-layer tight-buffered phase-stabilized optical cable of claim 1, wherein said second tight-buffered layer is an ethylene tetrafluoroethylene copolymer, has a melt flow index of between 10 and 25, a thickness of between 0.05mm and 0.15mm, and a peel force from said first tight-buffered layer of between 0.8N and 6N.
4. The dual-layer tight-buffered phase-stabilized cable of claim 3, wherein the second tight-buffered layer deformation rate is greater than or equal to 400%.
5. The method for preparing a double-layer tight-buffered phase-stabilized optical cable according to any one of claims 1 to 4, comprising the steps of:
(1) first extrusion molding: performing extrusion molding on the optical fiber and the first tight-jacketed material through an extruding machine to obtain a one-time extrusion phase-stabilized optical cable;
(2) and (3) performing secondary extrusion molding, namely performing extrusion molding on the primary extrusion molding phase-stabilized optical cable obtained in the step (1) and the second tight-sleeved layer material through an extruding machine to obtain the double-layer tight-sleeved phase-stabilized optical cable.
6. The method for preparing a double-layer tight-buffered phase-stabilized optical cable according to claim 5, wherein the step (1) comprises:
(1-1) carrying out pre-baking treatment on the first tight sleeve material, and preheating the optical fiber;
(1-2) injecting the prebaked first jacket material obtained in the step (1-1) into an extrusion mold, and extruding the same together with the preheated optical fiber through the extruder;
(1-3) air-cooling the optical fiber with the first tight-buffered layer obtained by extrusion molding in the step (1-2).
7. The method for preparing a double-layer tight-buffered phase-stabilized optical cable according to claim 6, wherein the preheating temperature of the optical fiber in the step (1-1) is 230 ℃ to 280 ℃ and the preheating time is 1s to 3 s.
8. The method for preparing the double-layer tight-buffered phase-stabilized optical cable according to claim 6 or 7, wherein the first tight-buffered layer material is phenylene terephthalamide, and the melt flow index is 17-26.
9. The method for preparing the double-layer tight-jacketed phase-stable optical cable according to claim 6 or 7, wherein the first tight-jacketed material in the step (1-1) is pre-baked at 100 ℃ to 150 ℃ for 6h to 15 h;
in the step (1-2), the temperature of an extrusion molding outlet is 320-400 ℃, and the production speed is 150-250 m/min;
step (1-3) air-cooling to 20 ℃ to 50 ℃.
10. The method for preparing the double-layer tight-buffered phase-stabilized optical cable according to claim 5, wherein the method comprises the step (2):
(2-1) carrying out pre-baking treatment on the second tight-sleeved layer material;
(2-2) injecting the pre-baked second tight-buffered material obtained in the step (2-1) into an extrusion mold, and extruding the second tight-buffered material and the primary extrusion phase-stabilized optical cable obtained in the step (1) through an extruder;
and (2-3) carrying out air cooling take-up on the optical fiber with the double tight-sleeved layers obtained in the step (2-2) by extrusion molding.
11. The method of claim 10, wherein the second tight-buffered material is an ethylene tetrafluoroethylene copolymer and has a melt flow index of between 10 and 25;
the pre-drying temperature of the second tight sheathing material in the step (2-1) is 40-100 ℃, and the pre-drying time is 3-8 h;
the temperature of an extrusion molding outlet in the step (2-2) is 310-350 ℃, and the production speed is 20-60 m/min;
and (3) cooling the air to 20-50 ℃, and taking up the wire under the tension of 0.6-2.0N.
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| CN113406757A (en) * | 2021-06-16 | 2021-09-17 | 江苏中天科技股份有限公司 | Butterfly-shaped optical cable and preparation method thereof |
| CN114236727A (en) * | 2022-01-05 | 2022-03-25 | 深圳市特发信息光网科技股份有限公司 | Double-layer tight-buffered optical fiber and method and apparatus for making same |
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| US8842956B2 (en) * | 2011-04-07 | 2014-09-23 | Linden Photonics, Inc. | Non-kink, non-hockling optical cable |
| CN102520477A (en) * | 2012-01-09 | 2012-06-27 | 南京全信传输科技股份有限公司 | High temperature (150 DEG C) resistant tightly packaged fiber and preparation process thereof |
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