CN115248486B - Optical cable with loose tube optical unit - Google Patents
Optical cable with loose tube optical unit Download PDFInfo
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- CN115248486B CN115248486B CN202211154570.7A CN202211154570A CN115248486B CN 115248486 B CN115248486 B CN 115248486B CN 202211154570 A CN202211154570 A CN 202211154570A CN 115248486 B CN115248486 B CN 115248486B
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- water
- blocking
- loose tube
- yarns
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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
- G02B6/441—Optical cables built up from sub-bundles
-
- 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
-
- 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
- G02B6/4432—Protective covering with fibre reinforcements
-
- 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
- G02B6/44384—Means specially adapted for strengthening or protecting the cables the means comprising water blocking or hydrophobic materials
Abstract
The present invention provides an optical cable having a loose tube optical unit, comprising: the waterproof structure comprises a plurality of cylindrical components, a plurality of first waterproof yarns, an outer protective sleeve, a support and a waterproof belt; the cylinder member includes: a plurality of first cylinder components and a plurality of second cylinder components, the first cylinder components comprising: the optical cable comprises a loose tube, a plurality of optical fibers and a plurality of second water-blocking yarns, wherein the loose tube is arranged on the periphery of the optical fibers, the optical fibers are arranged at the center of a first cylindrical component, the second water-blocking yarns are arranged at the edge of the first cylindrical component, the cylindrical component is arranged around a support, a water-blocking tape is arranged on the periphery of the cylindrical component, an outer protective sleeve is arranged on the periphery of the water-blocking tape, and the first water-blocking yarns are arranged at an idle position between the cylindrical component and the support and an idle position between the cylindrical component and the water-blocking tape.
Description
Technical Field
The invention relates to the technical field of optical cable communication, in particular to an optical cable with a loose tube optical unit.
Background
Most communication optical cables in urban areas of China are laid by adopting communication pipelines, and nonmetal pipeline optical cables are frequently used. However, in the conventional optical cable manufacturing technology, the optical cable is generally filled with grease, and the conventional optical cable is generally made of engineering plastics such as polybutylene terephthalate (PBT) or polypropylene (PP), and generally, the optical cable includes a reinforcing member embedded in a cable sheath.
The following problems exist in the prior art: the optical cable manufactured by adopting the existing engineering plastic is not corrosion-resistant and has weak lateral pressure resistance, the mode of filling the optical cable with factice for preventing water can cause inconvenient construction and low efficiency, and moreover, the traditional optical cable manufactured by adopting a non-metal material needs to be additionally provided with Kevlar or glass yarn Kevlar reinforcing materials, so that the manufacturing cost of the optical cable is increased.
In order to optimize the structure of the optical cable and reduce the manufacturing cost of the optical cable, it is necessary to develop an optical cable containing a light non-metal composite loose tube.
Disclosure of Invention
Aiming at the technical problems, the technical scheme adopted by the invention is as follows:
an optical cable having a loose tube optical unit, comprising: the waterproof device comprises a plurality of cylindrical components, a plurality of first waterproof yarns, an outer protective sleeve, a support and a waterproof belt; the cylinder member includes: a plurality of first cylinder components and a plurality of second cylinder components, the first cylinder components comprising: the optical fiber water blocking device comprises a loose tube, a plurality of optical fibers and a plurality of second water blocking yarns, wherein the loose tube is arranged on the periphery of the optical fibers, the loose tube (8) surrounds the optical fibers, the optical fibers are arranged in the center of a first cylindrical part, the second water blocking yarns are arranged on the edge of the first cylindrical part, the cylindrical part is arranged around a support, a water blocking tape is arranged on the periphery of the cylindrical part and surrounds the cylindrical part, an outer protective sleeve is arranged on the periphery of the water blocking tape and surrounds the water blocking tape, and the first water blocking yarns are arranged at idle positions between the cylindrical part and the support and idle positions between the cylindrical part and the water blocking tape; the number of the first water blocking yarns which can be placed in the optical cable is obtained through the following steps:
s100, obtaining a first water blocking yarn information list A = { A = } 1 ，……，A x ，……，A q }，A x =（A 0 x ，SA 0 x ，MA 0 x ），A 0 x Is the x-th first water-blocking yarn ID, SA 0 x The quantity of the xth first water-blocking yarn placed in the cable and capable of achieving the target water-blocking effect, MA 0 x The value of x is 1 to q, and q is the number of the first water-blocking yarns.
S200 acquiring target cylindrical component information list B = { B = { (B) } 1 ，……，B g ，……，B z }，B g For the g-th target cylinder component information, the value of g is 1 to z, and z is the number of target cylinder component information, wherein the target cylinder component information includes: target cylinder component and the number of target cylinder components placed in the cable, k g Is B g A corresponding number placed in the cable.
S300, according to the B, a first area list S1= (S1) is obtained 1 ，……，S1 g ，……，S1 z ），S1 g Is the g-th first area, the first area is the cylinder part and the support partIn the area between, wherein, S1 g The following conditions are met:
wherein R is 1 Is the value of the radius of the support, R g Is the value of the radius of the g-th target cylinder part.
S400, according to B, acquiring a second area list S2= { S2= { (S2) } 1 ，……，S2 g ，……，S2 z }，S2 g Is the g-th second area which is the area between the cylindrical component and the water-blocking tape, wherein S2 g The following conditions are met:
s500, obtaining a target first water blocking yarn number list C1= { C1 ] according to S1 and A 1 ，……，C1 g ，……，C1 z }，C1 g ={C1 g1 ，……，C1 gx ，……，C1 gq }，C1 gx To use A x Under the condition of (1), S1 g Number of corresponding target first water-blocking yarns, wherein C1 gx The following conditions are met:
C1 gx =⌊S1 g /MA 0 x ⌋。
s600, obtaining a first appointed water blocking yarn quantity list C2= { C2 } according to S2 and A 1 ，……，C2 g ，……，C2 z }，C2 g ={C2 g1 ，……，C2 gx ，……C2 gq }，C2 gx To use A x Under the condition of (1), S2 g Correspondingly appointing the number of the first water blocking yarns, wherein, C2 gx The following conditions are met:
C2 gx =⌊S2 g /MA 0 x ⌋。
s700, obtaining a key first water blocking yarn number list C3= { C3 } according to C1 and C2 1 ，……，C3 g ，……，C3 z }，C3 g ={C3 g1 ，……，C3 gx ，……，C3 gq }，C3 gx To use A x Under the conditions of (1), S1 g And S2 g Number of corresponding critical first water-blocking yarns, wherein C3 gx The following conditions are met:
C3 gx =C1 gx +C2 gx 。
the invention has at least the following beneficial effects:
(1) The loose tube 8 is made of Fiber Reinforced Polymer (FRP) material, so that the loose tube has the characteristics of light weight, stretch resistance, corrosion resistance, strong rigidity, strong lateral pressure resistance and the like, the service life of the optical cable is prolonged, frequent replacement of the optical cable is avoided, and time resources are saved.
(2) The water-blocking yarn is placed in the gap position to prevent water from entering the optical cable, so that the purpose of preventing the optical cable from being corroded by water is achieved, and the cylindrical component containing the fiber reinforced composite material can effectively prevent rodents from biting, so that the optical cable has good ratproof performance; in addition, the loose tube is made of the fiber reinforced composite material, so that the optical cable does not need Kevlar or glass yarn reinforcing materials, the manufacturing process is simplified, and resources are saved. Compared with the traditional optical cable filled with factice for water prevention, the optical cable provided by the embodiment of the invention is more environment-friendly, saves the manufacturing time and improves the efficiency of manufacturing the optical cable.
(3) Compared with the optical cable of the first embodiment of the invention, the central beam tube type optical cable only comprises the first cylindrical component and does not comprise the second cylindrical component, so that the optical cable is suitable for a communication line with small transmission optical signals, is more environment-friendly, improves the manufacturing efficiency, increases the communication capacity and improves the time efficiency.
(4) Through obtaining first area list and second area list, and then obtain the first yarn quantity list that blocks water of key, consequently, can adjust the quantity that blocks water yarn locating place and drum part through the result, the flexibility that blocks water yarn locating place has been improved, and can avoid setting up too little and can't reach the effect of blocking water owing to the yarn that blocks water, also can avoid setting up the extrusion that the optic fibre that places inside the optical cable produced that leads to too much owing to the yarn that blocks water, through the method, make the user save the time of simulation experiment, thereby efficiency has been improved.
(5) Through according to appointed drum information, acquire third area list and fourth area list, and then acquire the yarn quantity list that blocks water of target second, consequently, when first yarn quantity that blocks water is not enough to play the effect of blocking water, can be through the mode that adds the yarn that blocks water of second in the drum part, need not to change the inner structure of optical cable, improved efficiency, saved the time resource.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a layer-stranded optical cable having a loose tube unit according to an embodiment of the present invention;
FIG. 2 is a schematic structural view of a central tube optical cable having a loose tube unit according to another embodiment of the present invention;
FIG. 3 is a schematic diagram showing the loose tube configuration of FIGS. 1 and 2;
fig. 4 is a schematic flow chart of acquiring the amount of the first water-blocking yarns to be placed on the optical cable with the loose tube unit according to the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Furthermore, in the description of the present invention, the terms "mounted", "attached", "surrounding" and "connected" are to be construed broadly unless otherwise expressly limited. For example, the connection can be fixed, detachable or integrated; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. To those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in conjunction with specific situations.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in other sequences than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or server that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
As shown in fig. 1, an embodiment of the present invention provides an optical cable having a loose tube, the optical cable including: a plurality of cylinder parts 1, a plurality of first water-blocking yarns 3, an outer protective sleeve 4, a support 5 and a water-blocking tape 7.
Specifically, in the embodiment of the present invention, the optical cable is constructed in a layer-stranding manner.
In the present embodiment, the cylindrical member 1 includes: a plurality of first cylinder members 102 and a plurality of second cylinder members 104, said first cylinder members 102 comprising: the optical fiber water blocking device comprises a loose tube 8, a plurality of optical fibers 2 and a plurality of second water blocking yarns 6, wherein the loose tube 8 is arranged on the periphery of the optical fibers 2, the loose tube 8 surrounds the optical fibers 2, the optical fibers 2 are arranged in the center of the first cylindrical part 102, and the second water blocking yarns 6 are arranged on the edge of the first cylindrical part 102.
Specifically, the loose tube 8 is made of a non-metallic material.
Preferably, the loose tube 8 is made of Fiber Reinforced Polymer (FRP) material, so that the loose tube has the characteristics of light weight, stretch resistance, corrosion resistance, strong rigidity, strong lateral pressure resistance and the like, the service life of the optical cable is prolonged, frequent replacement of the optical cable is avoided, and time resources are saved.
Further, in the embodiment of the present invention, a serial number or a different color may be printed on the surface of the loose tube 8 for distinguishing each other.
Further, as shown in fig. 3, in the embodiment of the present invention, the loose tube 8 has a huff structure and the size of the loose tube 8 can be changed as needed, it can be understood that the size of the loose tube can be designed according to the number of the optical fibers 2 in the first cylinder member 102, and thus, flexibility is provided.
Further, the maximum number of the cylinder members 1 is M, M = [4-12], and is uniformly arranged around the support 5.
Further, the number of the first cylinder members 102 ranges from 1 to M, and it is understood that the number of the first cylinder members is not less than 1.
Preferably, in an embodiment of the present invention, M =6.
In the embodiment of the present invention, the cylindrical member 1 is disposed around the support 5, the water blocking tape 7 is disposed on the periphery of the cylindrical member 1, the water blocking tape 7 surrounds the cylindrical member 1, the outer protective cover 4 is disposed on the periphery of the water blocking tape 7, the outer protective cover 4 surrounds the water blocking tape 7, and the first water blocking yarn 3 is disposed at an idle position between the cylindrical member 1 and the support 5 and an idle position between the cylindrical member 1 and the water blocking tape 7.
Specifically, in the embodiment of the present invention, a flame retardant composite material is used as a manufacturing material of the outer protective sheath 4, so that the optical cable has a flame retardant effect, so as to prevent the optical cable from being damaged due to an excessive temperature.
In the method, the water-blocking yarns are placed in the gap positions to prevent water from entering the optical cable, so that the purpose of preventing the optical cable from being corroded by water is achieved, and the cylindrical component containing the fiber reinforced composite material can effectively prevent rodents from biting the cylindrical component, so that the optical cable has good ratproof performance; in addition, the loose tube is made of the fiber reinforced composite material, so that the optical cable does not need Kevlar or glass yarn reinforcing materials, the manufacturing process is simplified, and resources are saved. Compared with the traditional optical cable filled with factice for water prevention, the optical cable provided by the embodiment of the invention is more environment-friendly, saves the manufacturing time and improves the efficiency of manufacturing the optical cable.
In another embodiment of the present invention, as shown in fig. 2, there is provided an optical cable having a loose tube, the optical cable including: a first cylindrical member 102 and an outer protective sheath 4; the first cylinder member 102 includes: the optical fiber water blocking device comprises a loose tube 8, a plurality of optical fibers 2 and a plurality of second water blocking yarns 6, wherein the loose tube 8 is arranged on the periphery of the optical fibers 2, the loose tube 8 surrounds the optical fibers 2, the optical fibers 2 are arranged in the center of the first cylindrical part 102, and the second water blocking yarns 6 are arranged on the edge of the first cylindrical part 102.
Compared with the optical cable of the first embodiment of the invention, the central beam tube type optical cable only comprises the first cylindrical component and does not comprise the second cylindrical component, so that the optical cable is suitable for a communication line with small transmission optical signals, is more environment-friendly, improves the manufacturing efficiency, increases the communication capacity and improves the time efficiency.
As shown in fig. 4, the number of the first water-blocking yarns that can be placed in the optical cable is obtained by the following steps:
s100, obtaining a first water blocking yarn information list A = { A = } 1 ，……，A x ，……，A q }，A x =（A 0 x ，SA 0 x ，MA 0 x ），A 0 x Is the x-th first water-blocking yarn ID, SA 0 x The quantity of the xth first water-blocking yarn placed in the cable and capable of achieving the target water-blocking effect, MA 0 x The x-th first water blocking yarn is the largest cross-sectional area after water absorption and expansion, the value of x is 1 to q, and q is the number of the first water blocking yarns.
Specifically, the first water blocking yarn ID is a unique identification of the first water blocking yarn, and the first water blocking yarn ID may be a model of the first water blocking yarn.
Further, those skilled in the art know that the number of the first water blocking yarns which are placed in the optical cable and can achieve the target water blocking effect is obtained through simulation experiments, and is not described herein again.
Further, those skilled in the art know that the maximum cross-sectional area of the first water-blocking yarn after water absorption and expansion is obtained through simulation experiments, and will not be described herein again.
S200 acquiring target cylindrical component information list B = { B = { (B) } 1 ，……，B g ，……，B z }，B g For the g-th target cylinder component information, the value of g is 1 to z, and z is the number of the target cylinder component information, wherein the target cylinder component information includes: target cylinder component and the number of target cylinder components placed in the cable, k g Is B g A corresponding number placed in the cable.
Specifically, in the embodiment of the present invention, k g Is 4 or 6 or 8 or 10 or 12.
Preferably, k is g =6, when the drum part sets up to 6, make the inside overall arrangement of optical cable more pleasing to the eye.
S300, according to the B, a first area list S1= (S1) is obtained 1 ，……，S1 g ，……，S1 z ），S1 g Is the g-th first area, which is the area between the cylinder member and the support member, wherein S1 g The following conditions are met:
wherein R is 1 Is the radius value of the support, R g Is the value of the radius of the g-th target cylinder part.
In particular, one skilled in the art can obtain R by measurement 1 。
Further, one skilled in the art can obtain R from the measurement g 。
Further, R 1 ≠……≠R g ≠……R z It can be understood that when the number of the cylinder parts changes, the radius of the cylinder parts also changes, so that the cylinder parts uniformly surround the support, and the cylinder parts and the support are close to each other, thereby avoiding the reduction of the function of transmitting optical signals caused by the extrusion to the inside of the optical cable caused by loose arrangement.
S400, according to B, acquiring a second area list S2= { S2= { (S2) } 1 ，……，S2 g ，……，S2 z }，S2 g Is the g-th second area which is the area between the cylindrical member and the water blocking tape, wherein S2 g The following conditions are met:
s500, obtaining a target first water blocking yarn quantity list C1= { C1 } according to the S1 and the A 1 ，……，C1 g ，……，C1 z }，C1 g ={C1 g1 ，……，C1 gx ，……，C1 gq }，C1 gx To use A x Under the condition of (1), S1 g Number of corresponding target first water-blocking yarns, wherein C1 gx The following conditions are met:
C1 gx =⌊S1 g /MA 0 x ⌋。
s600, obtaining a first appointed water blocking yarn quantity list C2= { C2 } according to S2 and A 1 ，……，C2 g ，……，C2 z }，C2 g ={C2 g1 ，……，C2 gx ，……C2 gq }，C2 gx To use A x Under the condition of (1), S2 g Correspondingly appointing the number of the first water blocking yarns, wherein, C2 gx The following conditions are met:
C2 gx =⌊S2 g /MA 0 x ⌋。
s700, obtaining a key first water blocking yarn number list C3= { C3 } according to C1 and C2 1 ，……，C3 g ，……，C3 z }，C3 g ={C3 g1 ，……，C3 gx ，……，C3 gq }，C3 gx To use A x Under the conditions of (1), S1 g And S2 g Number of corresponding critical first water-blocking yarns, wherein C3 gx The following conditions are met:
C3 gx =C1 gx +C2 gx 。
above-mentioned, S500-S700 is through obtaining first area list and second area list, and then obtains the first yarn quantity list that blocks water of key list, consequently, can adjust the quantity of yarn locating place and drum part that blocks water through the result, improved the flexibility of yarn locating place that blocks water, and can avoid setting up too little and can not reach the effect of blocking water owing to the yarn that blocks water, also can avoid setting up the extrusion that the optic fibre that leads to inside the placing of optical cable produces owing to the yarn that blocks water excessively, through the method, make the user save the time of simulation experiment, thereby efficiency has been improved.
In the present embodiment, if C3 gx Less than SA 0 x The following steps are executed:
s10, obtaining a second water blocking yarn information list E = { E = (E) 1 ，……，E i ，……，E m }，E i =（E 0 i ，SE 0 i ，ME 0 i ），E 0 i Is the ith second water-blocking yarn ID, SE 0 i ME for the amount of the ith second water-blocking yarn placed in the first cylindrical member and capable of achieving the target water-blocking effect 0 i The value of i is 1 to m, and m is the number of the second water-blocking yarns;
specifically, the second water blocking yarn ID is a unique identification of the second water blocking yarn.
Further, m = q, it can be understood that a x =E i 。
S20, obtain the first cylinder part information list D = { D = 1 ，……，D g ，……，D z }，D g Specifying first cylinder part information for the g-th cylinder part, wherein specifying the first cylinder part information includes: specifying a first cylindrical member and specifying the number of fibres in the first cylindrical member, t g Is D g The number of optical fibers placed therein;
s30, acquiring a third area list S3= { S3= according to D 1 ，……，S3 g ，……，S3 z }，S3 g Is the g-th third area, wherein, S3 g The following conditions are met:
S3 g =t g *π*r g 2 ；
wherein r is g Is D g A corresponding fiber radius;
s40, acquiring a fourth area list S4= { S4 according to D and S3 1 ，……，S4 g ，……，S4 z }，S4 g Is the g-th fourth area, wherein, S4 g The following conditions are met:
S4 g =πR 2 g -S3 g ；
s50 according to D and S 4 Obtaining the second water resistance of the target yarn number list F = { F 1 ，……，F g ，……，F z }，F g ={F g1 ，……，F gi ，……，F gm }，F gi To use E i Under the condition of (1), S4 g Corresponding target second resistanceNumber of water yarns, wherein F gi The following conditions are met:
F gi =⌊S4 g /ME 0 i ⌋。
as described above, in S10-S50, the third area list and the fourth area list are obtained according to the information of the designated first cylinder, and the target second water-blocking yarn number list is further obtained, so that when the first water-blocking yarn number is not enough to perform a water-blocking function, the internal structure of the optical cable does not need to be changed by adding the second water-blocking yarn in the first cylinder component, thereby improving the efficiency and saving the time resource.
The present specification provides method steps as described in the examples or flowcharts, but may include more or fewer steps based on routine or non-inventive labor. The order of steps recited in the embodiments is merely one manner of performing the steps in a multitude of orders and does not represent the only order of execution. In practice, the system or server product may be implemented in a sequential or parallel manner (e.g., parallel processor or multi-threaded environment) according to the embodiments or methods shown in the figures.
Although some specific embodiments of the present invention have been described in detail by way of illustration, it should be understood by those skilled in the art that the above illustration is only for the purpose of illustration and is not intended to limit the scope of the invention. It will also be appreciated by those skilled in the art that various modifications may be made to the embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (6)
1. A fiber optic cable having a loose tube optical unit, comprising: the waterproof structure comprises a plurality of cylindrical components (1), a plurality of first waterproof yarns (3), an outer protective sleeve (4), a support (5) and a waterproof belt (7); the cylindrical member (1) comprises: a plurality of first cylinder members (102) and a plurality of second cylinder members (104), said first cylinder members (102) comprising: the optical fiber water-blocking device comprises a loose tube (8), a plurality of optical fibers (2) and a plurality of second water-blocking yarns (6), wherein the loose tube (8) is arranged at the periphery of the optical fibers (2) and the loose tube (8) surrounds the optical fibers (2), the optical fibers (2) are arranged at the central position of a first cylindrical component (102), the second water-blocking yarns (6) are arranged at the edge position of the first cylindrical component (102), the cylindrical component (1) is arranged around a support (5), the water-blocking tape (7) is arranged at the periphery of the cylindrical component (1) and the water-blocking tape (7) surrounds the cylindrical component (1), the outer protective sleeve (4) is arranged at the periphery of the water-blocking tape (7) and the outer protective sleeve (4) surrounds the water-blocking tape (7), and the first water-blocking yarns (3) are arranged at an idle position between the cylindrical component (1) and the support (5) and an idle position between the cylindrical component (1) and the water-blocking tape (7); the number of the first water blocking yarns (3) which can be placed in the optical cable is obtained through the following steps:
s100, obtaining a first water blocking yarn information list A = { A = } 1 ，……，A x ，……，A q }，A x =（A 0 x ，SA 0 x ，MA 0 x ），A 0 x Is the x-th first water-blocking yarn ID, SA 0 x The quantity of the xth first water-blocking yarn placed in the cable and capable of achieving the target water-blocking effect, MA 0 x The x-th first water-blocking yarn is the maximum cross-sectional area after water absorption and expansion, the value of x is 1 to q, and q is the number of the first water-blocking yarns;
s200, acquiring target cylindrical component information list B = { B = 1 ，……，B g ，……，B z }，B g For the g-th target cylinder component information, the value of g is 1 to z, and z is the number of target cylinder component information, wherein the target cylinder component information includes: target cylinder component and the number of target cylinder components placed in the cable, k g Is B g A corresponding number placed in the cable;
s300, according to the B, a first area list S1= (S1) is obtained 1 ，……，S1 g ，……，S1 z ），S1 g Is the g-th first area which is a cylindrical partAnd the area between the support member, wherein, S1 g The following conditions are met:
wherein R is 1 Is the radius value of the support, R g Is the value of the radius of the g-th target cylinder component;
s400, according to B, acquiring a second area list S2= { S2= { (S2) } 1 ，……，S2 g ，……，S2 z }，S2 g Is the g-th second area which is the area between the cylindrical component and the water-blocking tape, wherein S2 g The following conditions are met:
s500, obtaining a target first water blocking yarn number list C1= { C1 ] according to S1 and A 1 ，……，C1 g ，……，C1 z }，C1 g ={C1 g1 ，……，C1 gx ，……，C1 gq }，C1 gx To use A x Under the condition of (1), S1 g Number of corresponding target first water-blocking yarns, wherein C1 gx The following conditions are met:
C1 gx =⌊S1 g /MA 0 x ⌋；
s600, obtaining a first specified water blocking yarn number list C2= { C2 ] according to S2 and A 1 ，……，C2 g ，……，C2 z }，C2 g ={C2 g1 ，……，C2 gx ，……C2 gq }，C2 gx To use A x Under the condition of (1), S2 g Correspondingly appointing the number of the first water-blocking yarns, wherein, C2 gx The following conditions are met:
C2 gx =⌊S2 g /MA 0 x ⌋；
s700, obtaining a key first water blocking yarn number list C3= { C3 } according to C1 and C2 1 ，……，C3 g ，……，C3 z }，C3 g ={C3 g1 ，……，C3 gx ，……，C3 gq }，C3 gx To use A x Under the condition of (1), S1 g And S2 g Number of corresponding critical first water-blocking yarns, wherein C3 gx The following conditions are met:
C3 gx =C1 gx +C2 gx ；
if C3 gx Is less than SA 0 x The following steps are executed:
s10, obtaining a second water blocking yarn information list E = { E = (E) 1 ，……，E i ，……，E m }，E i =（E 0 i ，SE 0 i ，ME 0 i ），E 0 i For the ith second water-blocking yarn ID, SE 0 i For the number of i-th second water-blocking yarns placed in the first cylindrical part and able to reach the target water-blocking effect, ME 0 i The maximum cross-sectional area of the ith second water-blocking yarn after water absorption and expansion is 1 to m, and m is the number of the second water-blocking yarns;
s20, acquiring the specified first cylindrical part information list D = { D = { D = 1 ，……，D g ，……，D z }，D g Specifying first cylinder part information for the g-th cylinder part, wherein specifying the first cylinder part information includes: specifying a first cylindrical member and specifying the number of fibres in the first cylindrical member, t g Is D g The number of optical fibers placed therein;
s30, acquiring a third area list S3= { S3= according to D 1 ，……，S3 g ，……，S3 z }，S3 g Is the g-th third area, wherein, S3 g The following conditions are met:
S3 g =t g *π*r g 2 ；
wherein r is g Is D g A corresponding fiber radius;
s40, acquiring a fourth area list S4= { S4 } according to D and S3 1 ，……，S4 g ，……，S4 z }，S4 g Is the g th toFour areas, wherein, S4 g The following conditions are met:
S4 g =πR 2 g -S3 g ；
s50 according to D and S 4 Obtaining the second water-blocking of the target yarn number list F = { F = 1 ，……，F g ，……，F z }，F g ={F g1 ，……，F gi ，……，F gm }，F gi To use E i Under the condition of (1), S4 g Number of corresponding target second water-blocking yarns, wherein F gi The following conditions are met:
F gi =⌊S4 g /ME 0 i ⌋。
2. the fiber optic cable with loose tube optical unit of claim 1, wherein k is g Is 4 or 6 or 8 or 10 or 12.
3. Optical cable with loose tube optical unit according to claim 2, characterized in that k is g =6。
4. The fiber optic cable with a loose tube optical unit of claim 1, wherein m = q.
5. Optical cable with loose tube light unit according to claim 1, characterized in that the loose tube (8) is made of fiber reinforced composite material.
6. Optical cable with loose tube light unit according to claim 5, characterized in that the loose tube (8) is of a Haff-type construction.
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