CN106405758B - Outdoor irradiation-resistant optical cable and manufacturing method thereof - Google Patents
Outdoor irradiation-resistant optical cable and manufacturing method thereof Download PDFInfo
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- CN106405758B CN106405758B CN201610417966.4A CN201610417966A CN106405758B CN 106405758 B CN106405758 B CN 106405758B CN 201610417966 A CN201610417966 A CN 201610417966A CN 106405758 B CN106405758 B CN 106405758B
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- G—PHYSICS
- G02—OPTICS
- 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
- G02B6/4401—Optical cables
- G02B6/4429—Means specially adapted for strengthening or protecting the cables
- G02B6/443—Protective covering
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- G—PHYSICS
- G02—OPTICS
- 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
- G02B6/4401—Optical cables
- G02B6/4415—Cables for special applications
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- G—PHYSICS
- G02—OPTICS
- 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
- G02B6/4479—Manufacturing methods of optical cables
- G02B6/4486—Protective covering
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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Abstract
The outdoor irradiation-resistant optical cable comprises an optical fiber, a high-low temperature-resistant coating, a low expansion coefficient buffer layer, a high-low temperature-resistant fluorine buffer layer, a reinforcing fiber layer and a high-low temperature-resistant fluorine outer protective layer from inside to outside in sequence. The invention can meet the aerospace application requirements of low loss, high radiation resistance, extremely fast temperature change resistance, low shrinkage, bending resistance and the like, and can be directly exposed outside the spacecraft cabin, thereby realizing the functions of high-capacity digital, image, audio and video transmission or cabin penetrating interconnection and the like.
Description
Technical field:
the invention belongs to the technical field of optical fiber communication, and in particular relates to an outdoor irradiation-resistant optical cable which can meet the aerospace application requirements of low loss, high irradiation resistance, extremely fast temperature change resistance, low shrinkage, bending resistance and the like, is directly exposed outside a spacecraft cabin and is used for realizing high-capacity digital, image, audio and video transmission or cabin penetration interconnection, and a manufacturing method thereof.
The background technology is as follows:
with the deep application of the optical fiber communication technology in the aerospace field, the optical fiber is used as a medium for realizing high-speed networking or high-capacity information transmission of the spacecraft, and the application field of the optical fiber communication technology is gradually expanded from the inside of the spacecraft to the outside of the spacecraft or even in a more complex and severe environment in deep space. The outdoor optical cable is directly exposed to the conditions of high vacuum, high dose irradiation, wide temperature variation and the like outside the cabin, so that special requirements on cabling materials are met in the process of designing and manufacturing the optical cable, the range of selectable raw materials is narrow, and the cabling process is special.
The outdoor optical cable is first proposed and manufactured in China, and the technical approach of the outdoor optical cable is mainly a coating or direct extrusion molding mode. The coating mode is to directly coat a layer of wide temperature resistant silicone resin with a certain thickness outside the optical fiber, then adopt other modes such as fluorine buffer coating and the like, and then manufacture a layer of fluorine outer sheath after the fiber is reinforced. The direct extrusion molding mode refers to direct fluoroplastic tight packing or loose buffer outside the high-irradiation-resistance optical fiber.
The buffer mode of combining wide temperature-resistant silicone coating with fluorine tight package is adopted, the technical approach needs to carry out multiple coating and curing on the optical fiber, and the used coating is easy to cause continuous outgassing in an aerospace vacuum environment, so that the surface of precision optical equipment is polluted. Meanwhile, the used optical fiber coating has lower modulus, the whole optical cable is softer, the fluoroplastic can continuously age and shrink under the condition of rapid temperature change outside the cabin, the deformation of the optical cable is accelerated to be caused, the microbending loss is increased, and the long service life is difficult to ensure.
The method directly adopts the fluoroplastic buffer mode, the working procedure is relatively less, the molding process is simple, the high-temperature extrusion molding mode is generally adopted, but under the long-term extremely high-low temperature conditions, particularly below the glass transition temperature, the whole optical cable structure can deform and distort if the design is unreasonable, mainly because the expansion coefficient of the polymer is generally 10-1000 times that of glass, and the optical fibers under low temperature can be stressed due to the different expansion coefficients. At high temperatures, the polymer molecular chain activity increases and internal stresses are released. Stress relaxation occurs if the polymer buffer layer is maintained near or above the glass transition temperature. For a tight buffered cable of greater length, if the materials, structures and processes in subsequent cabling are not properly handled, axial stress layers such as extruded buffer layers can develop under long-term high and low temperature changes, which can increase the compressive stress of the fiber during use. The structure can cause the rapid increase of the loss of the optical cable after a certain period of temperature aging under the extremely rapid temperature change of-100 ℃ to 100 ℃. If loose sleeve buffering is adopted, the residual length of the optical fiber is difficult to control, and the situation that the follow-up microbending loss is continuously increased can be brought.
The invention comprises the following steps:
the invention aims to solve the technical problem of providing an out-of-cabin irradiation-resistant optical cable which can meet the aerospace application requirements of low loss, high irradiation resistance, extremely fast temperature change resistance, low shrinkage, bending resistance and the like, is directly exposed outside a spacecraft cabin, and is used for realizing high-capacity digital, image, audio and video transmission or cabin penetration interconnection, and a manufacturing method thereof.
The technical scheme is that the outdoor irradiation-resistant optical cable with the following structure comprises an optical fiber, a high-low temperature resistant coating, a high-low temperature resistant fluorine buffer layer, a reinforcing fiber layer and a high-low temperature resistant fluorine outer protective layer, wherein the high-low temperature resistant coating, the high-low temperature resistant fluorine buffer layer, the reinforcing fiber layer and the high-low temperature resistant fluorine outer protective layer are sequentially coated on the optical fiber, a buffer layer with a low expansion coefficient matched with the characteristics of the optical fiber is arranged between the high-low temperature resistant coating and the high-low temperature resistant fluorine buffer layer, and the reinforcing fiber layer is woven into a net-shaped structure by low-shrinkage high-strength high-modulus nonmetal continuous reinforcing fibers.
Preferably, the single-side wall thickness of the low expansion coefficient buffer layer and the high and low temperature resistant fluorine buffer layer of the outdoor irradiation-resistant optical cable disclosed by the invention can be 0.2-0.3 mm.
Preferably, the low expansion coefficient buffer layer of the outdoor irradiation-resistant optical cable according to the present invention may be any one of a bulk fluoride, a foamed fluoride, a copolyester, or an aromatic copolymer.
Preferably, the fiber in the reinforcing fiber layer of the outdoor irradiation-resistant optical cable disclosed by the invention can be any one of polyimide fiber, modified aramid fiber or special glass fiber. The reinforced fiber of the invention has certain rigidity, low elongation and low shrinkage rate while ensuring high-strength and high-modulus characteristics, and has relatively large friction coefficient on the fiber surface, so that the shrinkage problem of the outer sheath can be effectively overcome compared with other high-strength and high-modulus fibers. After the fiber is formed by proper weaving pitch, the material elongation at the two ends of the optical cable can be reduced when the temperature of the optical cable is changed at high and low temperatures, so that the problem that the optical loss is increased or the optical fiber is broken due to the fact that the end face of the optical cable stretches out and bends after the high and low temperatures is effectively solved when the optical cable is subsequently manufactured into a joint.
Preferably, the outdoor irradiation-resistant optical cable disclosed by the invention, wherein the high-low temperature resistant fluorine buffer layer and the high-low temperature resistant fluorine outer protective layer can adopt any one of PFA, FEP or ETFE.
Preferably, the outdoor irradiation-resistant optical cable disclosed by the invention is characterized in that the optical fiber can be a specially doped anti-Gao Fuzhao optical fiber, and the optical fiber can adopt a mode of pure silicon core, cladding fluorine doping or core cladding co-fluorine doping.
Preferably, the outdoor irradiation-resistant optical cable disclosed by the invention, wherein the high-low temperature-resistant coating can be any one of acrylic polyester, polyimide or high-low temperature-resistant silicone.
Preferably, the outdoor irradiation-resistant optical cable disclosed by the invention can adopt a mode of pure silicon core, cladding fluorine doping or core cladding co-fluorine doping.
In addition, the invention also provides a manufacturing method of the outdoor irradiation-resistant optical cable, which comprises the following steps:
(1) firstly, coating a high-low temperature resistant coating on an optical fiber;
(2) extruding a buffer layer with low expansion coefficient matched with the optical fiber) on the high-low temperature resistant coating;
(3) extruding a high-low temperature resistant fluorine buffer layer on the buffer layer with low expansion coefficient;
(4) then weaving the reinforced fiber layer (5) into a net structure by a multi-strand weaving mode outside the high-temperature and low-temperature resistant fluorine buffer layer;
(5) finally, extruding a layer of high-low temperature resistant fluorine outer protective layer outside the reinforced fiber layer to form the finished optical cable.
Preferably, the manufacturing method of the outdoor irradiation-resistant optical cable comprises the steps of forming a rigid tight cladding with a single side thickness of 0.2-0.3 mm after the low expansion coefficient buffer layer is subjected to high-temperature melting, directional stretching and vacuum tight cladding at 280-320 ℃, and forming the high and low temperature resistant fluorine buffer layer by high-temperature melting, extrusion molding at 280-320 ℃ and a single side wall thickness of 0.2-0.3 mm, so that process temperature matching of the two buffer layers is realized, and the two buffer layers are effectively combined together in a hot water cooling mode to form the composite optical unit with better flexibility.
After adopting the structure and the method, compared with the prior art, the invention has the following advantages:
according to the invention, a buffer layer with relatively strong rigidity and matched expansion coefficient is introduced between the high-low temperature resistant coating and the high-low temperature resistant fluorine buffer layer, and a flexible fluorine buffer layer is extruded on the buffer layer to form a composite buffer light unit with good toughness, so that the stress on the optical fiber is extremely small, the whole toughness of the optical cable is improved, the deformation at high and low temperatures is avoided, and meanwhile, the buffer layer can well reduce the stress on the optical fiber caused by extremely rapid temperature change and reduce microbending loss. In addition, the reinforced fiber layer woven by the low-shrinkage high-strength high-modulus nonmetal continuous reinforced fiber can effectively reduce the shrinkage effect of the optical cable at high and low temperatures, reduce the period of heat pretreatment in the subsequent optical cable application, and effectively ensure the structural stability after molding. The invention forms a round structure by adopting the modes of composite buffering, fiber reinforcement and outer sheath extrusion molding, ensures the extremely fast temperature change resistance of the composite buffering layer, and the outer sheath and the low shrinkage reinforcing layer well protect the optical unit from being damaged by mechanical stress, thereby reducing the whole thermal shrinkage deformation of the optical cable. In conclusion, the invention meets the aerospace application requirements of low loss, high radiation resistance, extremely fast temperature change resistance, low shrinkage, bending resistance and the like, can be directly exposed outside the spacecraft cabin, and realizes the functions of high-capacity digital, image, audio and video transmission or cabin penetrating interconnection.
Description of the drawings:
FIG. 1 is a schematic view of an external irradiation-resistant optical cable according to the present invention;
fig. 2 is a flow chart of a manufacturing process of the irradiation-resistant optical cable outside the cabin.
The specific embodiment is as follows:
the invention relates to an out-cabin radiation-resistant optical cable and a manufacturing method thereof, which are further described in detail below with reference to the accompanying drawings and the detailed description:
as shown in fig. 1, the outdoor irradiation-resistant optical cable comprises an optical fiber 1, a high-low temperature resistant coating 2, a high-low temperature resistant fluorine buffer layer 4, a reinforced fiber layer 5 and a high-low temperature resistant fluorine outer protective layer 6 which are sequentially coated on the optical fiber 1, wherein a low expansion coefficient buffer layer 3 with a certain rigidity, which is matched with the characteristics of the optical fiber 1, is arranged between the high-low temperature resistant coating 2 and the high-low temperature resistant fluorine buffer layer 4, the reinforced fiber layer 5 is formed by braiding a network structure by low-shrinkage high-strength high-modulus nonmetal continuous reinforced fibers, and the low expansion coefficient buffer layer 3 and the high-low temperature resistant fluorine buffer layer 4 with relatively good flexibility form a composite buffer layer. The low expansion coefficient buffer layer 3 is formed by extrusion molding of any one of bulked fluoride, foamed fluoride, copolyester or aromatic copolymer, the high and low temperature resistant fluorine buffer layer 4 and the high and low temperature resistant fluorine outer protective layer 6 are made of any one of PFA, FEP or ETFE, and the high and low temperature resistant coating 2 is any one of acrylic polyester, polyimide or high and low temperature resistant silicone.
The composite buffer layer directly plays a role in reducing the stress magnitude and the light transmission stability of the optical fiber under wide temperature variation, the traditional buffer layer is used for reducing the temperature stress of the optical fiber, and a single flexible layer is adopted to play a role in stress buffering and releasing, but the structure is difficult to adapt to the requirement of wide temperature variation, and the stress of the flexible buffer layer can be accumulated under long-term reciprocating circulation to cause structural deformation so as to gradually destroy the transmission performance of the optical fiber. To avoid stress stack-up due to structural relaxation, material aging, and irradiation of the cable under stress conditions can exacerbate mechanical performance degradation. The invention adopts a unique composite buffer structure consisting of the buffer layer 3 with low expansion coefficient and the fluorine buffer layer 4 with high and low temperature resistance, thereby achieving the effect of hardness and softness. The rigid buffer layer, namely the buffer layer 3 with low expansion coefficient, is extremely stable at high and low temperatures, can directly offset the stress of other flexible layers, ensures that the structure of the optical cable has better bearing capacity and stability when the optical cable is impacted at high and low temperatures, and the stress cannot be transmitted to the core transmission element optical fiber. The flexible secondary buffer layer, namely the high-temperature and low-temperature resistant fluorine buffer layer 4, can play a good flexible buffer role on the rigid layer, ensure the flexibility and bending characteristics of the whole composite buffer layer, and promote the bending capability of the whole optical cable, so that the whole optical cable can be reliably applied under a small bending radius. In addition, the whole state of the optical cable structure is ensured to be stable by extruding a thin-wall flexible outer sheath. The structure can be well adapted to the outdoor environment.
In order to realize stable transmission of optical signals under high irradiation conditions, the invention adopts a novel high-temperature-resistant high-irradiation-resistant optical fiber compatible with common single-mode optical fiber on the design of the optical fiber 1, the optical fiber 1 is a special doped anti-Gao Fuzhao optical fiber, and the optical fiber 1 adopts a mode of doping fluorine in a pure silicon core, a cladding or co-doping fluorine in a core cladding. The introduction of doping elements reduces the probability of network breakage of the defect structure in a low-energy state, and the defect concentration is reduced. The proper amount of doping elements can repair the damaged network, maintain the stability of the network, and mainly show stable induced loss in irradiation attenuation. At high radiation doses, the irradiation energy can cause breakage of chemical bonds of the cable material, cause deterioration of the strength and elongation properties of the material, and even cause cracking. The other cabling materials used for the out-cabin radiation-resistant optical cable have good capability of resisting total dosage of more than 18Mrad (Si), and the tolerance margin of the material is larger.
The irradiation-resistant optical cable is limited by the characteristics of raw materials, and most of optical cable materials which can be used in aerospace environment have the characteristics of irradiation resistance and high and low temperature resistance, but the materials can cause relative shrinkage among all layers of the optical cable under the condition of long-term high and low temperature aging due to shrinkage characteristic difference among all layers of the optical cable. If the shrinkage is too large, the link attenuation may be increased in a short period, and deformation, detachment and even failure may be caused between the optical cable and the subsequent fixed joint in a long period. In order to ensure the stable application of the optical cable at high and low temperatures for a long time, the outdoor irradiation-resistant optical cable adopts low-shrinkage high-strength high-modulus nonmetal continuous reinforced fiber which is any one of polyimide fiber, modified aramid fiber or special glass fiber. The fiber has high rigidity and relatively high surface friction coefficient, and meanwhile, the fiber can be used as a reinforcing layer to reduce the relative displacement between the composite buffer layer and the outer protective layer and reduce the relative change, thereby reducing the integral shrinkage of the optical cable. In addition, the thermal characteristics of the low shrinkage fiber are matched with those of other layers of the optical cable, so that the stability of the optical cable structure can be ensured in a high-low temperature state.
Under the extremely rapid temperature change of-100 ℃ to 100 ℃ outside the cabin, the high-low temperature alternating times reach more than 6 ten thousand times, and the rapid temperature alternating period is only about 1 half hour. The long-term rapid temperature change causes the low-temperature shrinkage and the increase of modulus of materials used for the optical cable, so that the microbending phenomenon of the optical fiber occurs, and the loss is increased. The high-low temperature reciprocating cycle, extremely low temperature and long-term working at high temperature can cause the optical cable sheath material and the optical fiber coating material to generate fatigue effect, the material is embrittled, the sheath layer is caused to crack, and the optical cable is caused to fail. In order to solve the problem of extremely rapid temperature change of-100 ℃ to 100 ℃ of outdoor resistance, the invention optimizes and selects the raw materials with excellent wide temperature resistance, the temperature range can meet the requirements of-100 ℃ to 100 ℃, and the optical cable material has long-term stable structure at the temperature. The selected reinforced fiber material has good thermal shrinkage stability, certain rigidity and stress deformation with other flexible materials, and the rigid net structure of the fiber ensures that the internal stress of the cable core is mutually counteracted, can effectively buffer the stress and deformation, and ensures the stability of the optical cable structure at high and low temperature.
The thickness of the buffer layer is very specific, the selected high-irradiation-resistant optical fiber is specially doped to adapt to the irradiation environment outside the cabin, the requirement of transmission loss under the irradiation outside the cabin is met, but the optical fiber is sensitive to stress such as bending and pressure, and the optical fiber is balance and trade-off of performance. Through a large number of verification, when the thicknesses of the buffer layer with low expansion coefficient and the fluorine buffer layer are thinner, the material shrinkage stress is small and the loss is lower at high and low temperatures, the flexibility of the buffer layer is improved to a certain extent, but the mechanical properties such as pressure resistance and the like are poorer, and the optical cable can not meet the self standard requirement although the optical cable is shorter in length during application; when the thickness of the low expansion coefficient buffer layer is thinner and the thickness of the fluorine buffer layer is thicker, although mechanical characteristics such as pressure resistance and the like are improved, the flexibility of the buffer layer is improved higher, but the shrinkage stress of the fluorine material is large and the loss is higher at high and low temperatures, so that the influence on the key transmission performance of the optical cable is larger; when the thickness of the buffer layer with low expansion coefficient is increased and the fluorine buffer layer has a certain thickness, not only the mechanical properties such as compressive resistance and the like are improved, but also the flexibility of the buffer layer is improved higher, and the transmission performance of the optical cable can not be influenced under extremely high and low temperatures. According to the invention, through thickness design between two buffer layers and mechanical and high-low temperature adaptability verification, the single-side wall thickness of the buffer layer 3 with low expansion coefficient and the fluorine buffer layer 4 with high-low temperature resistance is finally confirmed to be 0.2-0.3 mm.
As shown in FIG. 2, the manufacturing method of the outdoor high-irradiation-resistance optical cable adopts the following five procedures:
(1) firstly, coating a high-low temperature resistant coating 2 with a certain thickness on an optical fiber 1;
(2) extruding a buffer layer 3 with low expansion coefficient matched with the characteristics of the optical fiber 1 on the high and low temperature resistant coating 2;
(3) then extruding a high-low temperature resistant fluorine buffer layer 4 on the buffer layer 3 with low expansion coefficient, thereby forming a composite buffer layer;
(4) then uniformly and compactly winding high-strength high-modulus low-shrinkage yarns around the composite buffer layer in a multi-strand braiding mode outside the high-low temperature resistant fluorine buffer layer 4, and braiding the high-strength high-modulus low-shrinkage yarns into a reinforcing fiber layer 5 with a net structure;
(5) finally, a layer of high-temperature and low-temperature resistant fluorine outer sheath 6 is extruded outside the reinforced fiber layer 5 in a high-temperature outer sheath extrusion molding mode, and the development of the optical cable is completed.
In the process, the low expansion coefficient buffer layer 3 is made of a rigid low expansion coefficient material, and the low expansion coefficient buffer layer 2 is required to be subjected to high-temperature melting, directional stretching and vacuum tight wrapping at 280-320 ℃ to form a tight wrapping layer with rigidity and single side thickness of 0.2-0.3 mm. The rigid buffer layer is different from the traditional high-temperature extrusion molding flexible buffer layer, stress such as shrinkage of other materials of the optical cable can be directly born by the rigid layer under the high-low temperature condition during rigid buffer, and is difficult to transfer to the optical fiber, and the traditional flexible buffer layer is characterized in that the stress of the materials under the high-low temperature is gradually absorbed and buffered, and the stress can be eliminated within a certain range. In addition, through the tight package of vacuum, effectively improve tight package and easily fold the problem. The fluorine buffer layer can effectively improve the problems of wear resistance and easy cracking caused by the first rigid buffer layer, so that the high-low temperature resistant fluorine buffer layer 4 is formed by melting and high-temperature extrusion molding at 280-320 ℃ and has the single-side wall thickness of 0.2-0.3 mm, the process temperature matching of the two buffer layers is realized, and the two buffer layers are effectively combined together in a hot water cooling mode to form a composite optical unit with good flexibility, so that the defects of poor toughness and easy folding of the first buffer layer are overcome.
The invention optimizes and selects the primary buffer layer, the secondary buffer layer and the reinforcing fiber of the optical fiber by a unique composite buffer light unit and a low-shrinkage high-strength high-modulus fiber reinforcement mode, is matched with materials such as an optical fiber coating, an outer sheath material and the like, and enables the additional loss of the high-irradiation-resistance optical fiber under the extremely rapid temperature change outside a cabin to be lower and the stability to be effectively controlled by the technical approaches such as secondary composite buffer, fiber braiding reinforcement, thin-wall fluorine outer sheath extrusion molding and the like and the control of reasonable buffer outer diameter, reinforcement pitch and other technological parameters. The outdoor optical cable manufactured by the structure effectively reduces the stress of the optical fiber in the severe outdoor environment, and ensures that the optical fiber has lower and stable transmission loss under the conditions of wide temperature variation, high irradiation dose, small bending radius and the like.
The outdoor irradiation-resistant optical cable has low attenuation constant (alpha) 1310nm ≤0.5dB/km、α 1550nm Less than or equal to 0.25 dB/km), high radiation resistance (more than or equal to 18Mrad (Si)), wide temperature variation resistance (-100 ℃), small low shrinkage outer diameter (less than or equal to 2 mm), good bending performance (less than or equal to 50 mm) and the like, and meets the application conditions of outside space navigation such as neutron radiation, thermal vacuum, vacuum outgassing, material toxicity and the like.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solution of the present invention should fall within the scope of protection defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (9)
1. The utility model provides an outside-cabin anti-radiation optical cable, includes optic fibre (1) and cladding in proper order high low temperature resistant coating (2), high low temperature resistant fluorine buffer layer (4), reinforcing fiber layer (5) and high low temperature resistant fluorine outer sheath (6) on optic fibre (1), its characterized in that: and a buffer layer (3) with a low expansion coefficient, which is matched with the characteristics of the optical fiber (1), is arranged between the high-low temperature resistant coating (2) and the high-low temperature resistant fluorine buffer layer (4), and the reinforced fiber layer (5) is woven into a net structure by low-shrinkage high-strength high-modulus nonmetal continuous reinforced fibers.
2. An outside-cabin irradiation resistant optical cable according to claim 1, wherein: the unilateral wall thickness of the low expansion coefficient buffer layer (3) and the high and low temperature resistant fluorine buffer layer (4) is 0.2 mm-0.3 mm.
3. An outside-cabin irradiation resistant optical cable according to claim 1, wherein: the low expansion coefficient buffer layer (3) is any one of bulked fluoride, foamed fluoride, copolyester or aromatic copolymer.
4. An outside-cabin irradiation resistant optical cable according to claim 1, wherein: the fiber in the reinforced fiber layer (5) is any one of polyimide fiber, modified aramid fiber or special glass fiber.
5. An outside-cabin irradiation resistant optical cable according to claim 1, wherein: the high-low temperature resistant fluorine buffer layer (4) and the high-low temperature resistant fluorine outer protective layer (6) are made of any one of PFA, FEP or ETFE.
6. An outside-cabin irradiation resistant optical cable according to claim 1, wherein: the optical fiber (1) is a special doped anti-Gao Fuzhao optical fiber, and the optical fiber (1) adopts a mode of pure silicon core, cladding fluorine doping or core cladding fluorine co-doping.
7. An outside-cabin irradiation resistant optical cable according to claim 1, wherein: the high-low temperature resistant coating (2) is any one of acrylic polyester, polyimide or high-low temperature resistant silicone resin.
8. A method for manufacturing an external irradiation-resistant optical cable according to any one of claims 1 to 7, wherein: the manufacturing method comprises the following steps:
(1) firstly, coating a high-low temperature resistant coating (2) on an optical fiber (1);
(2) extruding a buffer layer (3) with low expansion coefficient, which is matched with the characteristics of the optical fiber (1), on the high-temperature and low-temperature resistant coating (2);
(3) then extruding a high and low temperature resistant fluorine buffer layer (4) on the low expansion coefficient buffer layer (3);
(4) then, a reinforcing fiber layer (5) with a net structure is woven outside the high-low temperature resistant fluorine buffer layer (4) in a multi-strand weaving mode;
(5) finally, a layer of high-low temperature resistant fluorine outer protective layer (6) is extruded outside the reinforced fiber layer (5) to form the finished optical cable.
9. The method for manufacturing an outside-cabin irradiation-resistant optical cable according to claim 8, wherein: the low expansion coefficient buffer layer (3) is made of rigid low expansion coefficient materials, the low expansion coefficient buffer layer (3) is subjected to high-temperature melting, directional stretching and vacuum packing at 280-320 ℃ to form a rigid tight cladding with single-side thickness of 0.2-0.3 mm, the high-low temperature resistant fluorine buffer layer (4) is formed by high-temperature melting and extrusion molding at 280-320 ℃ and single-side wall thickness of 0.2-0.3 mm, process temperature matching of the two buffer layers is achieved, and the two layers are effectively combined together in a hot-water cooling mode to form the composite optical unit with good flexibility.
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| CN110133796A (en) * | 2019-04-11 | 2019-08-16 | 山东太平洋光纤光缆有限公司 | A kind of irradiation resistant fiber and preparation method thereof |
| CN113253407B (en) * | 2021-04-30 | 2023-01-10 | 安徽光纤光缆传输技术研究所(中国电子科技集团公司第八研究所) | Method for manufacturing extravehicular irradiation-resistant bundled optical cable |
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