JPS582804A - Submarine optical fiber cable transmission line - Google Patents

Abstract

PURPOSE:To eliminate the breaking of wire, to reduce optical loss, and to prevent the generation of strain during use, by installing an optical fiber assembly in a pressure-tight layer loosely, uniting the optical fiber assembly with a center support, and drawing and hooking the center support to a housing. CONSTITUTION:A pressure-light pipe 12 is made of a steel plate, and an abutting surface 13 is welded. The external circumference of the pipe 12 is surrounded with plural tensile strength wires 14, and an external sheath 15 is provided around them. In the pressure-tight pipe 12, an optical assembly 11 is installed with a space 18. The optical fiber assembly 11 consists of a center support 21 of a piano wire, a buffer layer 22 of polystyrene, an optical fiber core 23, a buffer layer 24, and a pressure winding 25. Pressure-tight pipes 12a and 12b of optical cables 32 and 33 are inserted into a connection part housing 31, and while cores 23a and 23b are connected together as shown by 39, center supports 21a and 21b are welded together and fixed by anchor clamping tools 41a and 41b.

Description

[Detailed Description of the Invention] This invention provides a light source that can be placed on the ocean floor, IIl bottom, river bottom, etc.
It is used for transmission of GT, and optical fiber cables are connected through connections such as mid-sound and cable connection re.
A book about the optical fiber cable transmission line for J11 Kaimaro.

Conventionally, the 7-Aipa cable for O-Umihawk had the configuration shown in Figures 1 to 3. That is, as shown in FIG.
The joint of the pipe 12, that is, the both side edges of the copper plate O
5Im mating surfaces 13a are mutually S*. the pipe 1
2C) K11 f number tensile strength line 14 to surround this on the outside
is arranged, and the tensile strength wire 146 is further covered with an outer sheath 1s of polyethylene, for example. The tensile strength wire 14 is, for example, a steel wire. The pipe 12 is made of aluminum and has 4 round pipes. In that case, the center mating surface 13 is welded to I", so the butt 9 is simply defined as -.

Alternatively, as shown in No. 2!1IK, there is also a structure in which the optical fiber collection body 11 is surrounded by three aluminum pieces 16 extending in the longitudinal direction of the optical fiber assembly 11.
! , as shown in the KfllNI diagram, the light 7 Aiper aggregate 11
There are also tensile strength 1114 straight lines on the outside.

As shown in Figure 1, the pipe 12 in Figure 1, the aluminum 9mm piece 16 in Figure 2, and the tensile strength 1114 in Figure 3 are rounded pressure-resistant layers that can withstand the large water pressure that the Hikari Tsuaipa cable receives when placed on the seabed. It was composed. Trenched optical fiber assembly 111
1.It is housed in a pressure-resistant layer, making it a great help when laying submarine optical cables or repairing SWC cables.
However, the submarine optical cable is also piped along this undulation, and the optical fiber assembly 11 in this rounded cable may shift, causing large distortion to the optical fiber. Therefore, there is no such deviation, and the elongation characteristics of the optical fiber assembly 11 and the tensile strength 6114 of the surrounding area are equal, for example, in each part of the seabed, only the optical fiber assembly 11 is strongly compressed, and the opposite In order to prevent only the optical fiber assembly 11 from being strongly stretched in the mountains of the seabed, conventionally, an interlayer adhesion force was established between the optical fiber assembly 11 and the pressure-resistant layer. Due to the mutual friction 11 of the Seki, the Wei is also 1%/% so that Kll is 9.

However, in order to determine an appropriate interlayer adhesion force, a high level of manufacturing technology is required, and the dimensional accuracy of each member of the stack is also required to be very high. The method of setting the writing force between the pressure-resistant layer and the optical 7-eyeper aggregate is to reduce the diameter by cutting it with a die. If the outer diameter of the optical fiber assembly before being reduced is dl, and the outer diameter after being reduced is da, then
The reduction rate R is expressed by the following formula: % Considering the elastic range of the optical fiber assembly, this reduction rate R can only be tolerated by 1 to 11 degrees at most. For example, if the outside @ d * of the optical fiber assembly is 4■ and Rwmo is 01, the reduction amount (da-da) is 40s- according to equation (1), and each member has the exact *n dimensional accuracy and Manufacturing precision is required. In reality, in a factory that sets the interlayer adhesion force, there are problems with manufacturing accuracy while maintaining the accuracy of component dimensions.
Lateral pressure and minute loops act on the optical fiber 7, increasing transmission loss and causing aggregation in the voltage-resistant layer or disconnection. In addition, the interlayer adhesion force set at the time of manufacturing decreases over time due to the creep phenomenon of the plastic material, which is the constituent material on which the optical fiber assembly grows, and the long-term Ka optical 7 eyelid assembly is p, and there is a risk that large distortions will occur in the optical 7-eyeper.

The purpose of W140 from ζO is to provide optical fiber O to the manufacturer 11.
There is no WS line, there is little increase in light loss, and it can be used for 11 m.
To provide a transmission line for an optical 7-eye cable for submarine use, which has small elongation strain on the optical 7-eye cable and does not cause elongation strain over time on the seabed surface.

According to ζO emission wJ4, the light 7 Aiper aggregate is spatially 1 in the pressure-resistant layer! It is stored with kVP and >>, and the light running 7 Aipa prefecture combination is integrated with the center support placed in the center of it, eliminating the off-in between them, and the center support is connected to the light cape # connection part, etc. Body, trench relay - Intermediate series IIO pressure capacity S This figure shows the floor space for the optical fiber cable S in the example of the optical fiber cable S for use in the optical 7 Aipah cable @transmission path Oml vagina example. Pressure resistant pipe 1
For example, the same INK steel pipe as in the case of FIG.
The point that the optical fiber assembly 11 is housed inside is the same as in the conventional case. Durable pub 1! It is also possible to use the breakdown voltage layer shown in FIGS. 1 to 3 as L.

In this invention, light? The adhesion force between the six layers is not constant between the AIP aggregate 11 and the pressure-resistant "Eve 12", and a space 18 is provided between them. 21 is placed,
Circumference i of the central support 21! l-A plurality of optical fiber cores (six in the figure) are arranged via a polyethylene O buffer layer 22 as required. The optical fiber core 23 is generally an optical fiber coated with a synthetic resin. Surrounding the outside of these optical fiber cores 280 is, for example, a polypropylene SO buffer layer 24, and further a presser wrapper 28 of, for example, a polyester film is wound thereon. As will be described later, the center 23 and the center support 21 are prevented from sliding against each other.

Figure 6 of cylinder is based on the optical fiber cable shown in No. 411.
1 shows a submarine optical fiber cable transmission line of the present invention connected to a pull-up network. The connecting part 31 is made of, for example, a cylindrical O-iron-beryllium copper, and optical cables 82, 330 are formed at both ends of the connecting part 31 and are to be connected through round holes.
The pressure-resistant pipes 12 and 12b at one end of each are inserted. Optical couple 32.330 each end Iku O tensile strength line 14m, 14b
are provided on the outer periphery of both ends of the reel body 3X, respectively.
&, 141eK, which is determined, for example, by adhesion cm.

The inside of the 11 body 31 is divided into three by the partitions 11″s s and s sa in the arrangement direction of the cables 82.38, and the partition wall 3
Cable 3 through small holes 17 and 38 which can be drilled into S, 36! $33 each party 7 AIPA core line 28 &
,! 8b are inserted one by one into the central dowel of the receptacle 31, and these inserted optical fiber cores llI231.1
1bO corresponding tortoise wire optical fiber, KIK connection shown as 113. Cape 88 spirits 58804)
The center supports 21m and 21b are also inserted through the bulkheads 35.36 and are connected to each other by the flllm or sleeve cover.
At +41m and 41b, it was bitten and fixed to the bulkhead. In order to make the center 1142 watertight with respect to both sides 01, the small holes 87, 88 and the central support insertion hole are sealed with rubber, epoxy resin, etc., for example.

Hikari 7 Aipa collective! ! and the space 18 between the pressure-resistant pipe 12
The larger the thickness, the easier it is to manufacture, but if the thickness is 0, the pressure resistance will be weak, the trench cable will not be thick, and the material cost will be high. Therefore, the space 18 is selected as follows, for example. Ru. That is, the outer diameter of the optical fiber assembly 110 is dl±Δds,"
When the inner diameter of the pressure-resistant pipe 12 is d, the space 3 is
is made small in the range that satisfies .

In this way, the submarine optical fiber cape invented by HiO
□ In the transmission line, the line light 7 eyeper assembly 11 is connected to the pressure-resistant pipe 12.
Since the empty IMj 18 is stored inside the cable, there is no risk of lateral pressure being applied to the optical 7 eyelid assembly 11 during the installation of the pressure-resistant pipe, during the O-cable conversion process, or at the end of actual use. Even if - is round and p occurs, the optical fiber assembly 11 is smaller than the case where there is no 18 between 9
This is achieved by keeping the lateral pressure on the body to a minimum. Therefore, it becomes easier to prevent an increase in manufacturing loss and breakage of the optical fiber core 2sO in the manufacturing process 11 after the pressure-resistant pipe forming process.

In addition, since there is a space 18 between the pressure-resistant pipe 1 and the optical fiber 7-aipa assembly 11 and t)M, there is a space 18 in which the optical fiber core is thicker than the optical fiber core. Therefore, it is possible to prepare a long O submarine optical cable O, and it is also possible to create a cable connection part casing 04 that does not have a relay function.

By injecting a fluid or #i powder into the space 18 according to the required conditions, there is also the advantage that the pressure resistance of the pressure-resistant pipe can be increased. Figure 6 shows a mourning dovecote with sherry in space 18 and a pressure-resistant pipe xx
The horizontal axis shows the number of times the oI1m load is removed, the vertical axis shows the buckling load, -[431 shows the case when sherry is added, and the song 1i44 shows the case when nothing is added. As shown in Fig. 6, even if the number of bends is increased by enclosing a cylindrical pipe and increasing the number of bends, the pressure-resistant pipe 1
It can be seen that the pressure resistance of No. 2 has increased. The fluid sealed in the space 18 includes the optical power collector 11 and the pressure-resistant pipe 12.
It is preferable to use a powder that has low frictional resistance and does not increase the friction between the material and the powder, and for example, calcium sulfate powder can be used as the powder.

A space 1 is provided between the optical fiber assembly 11 and the pressure-resistant pipe 12.
There is a possibility that a large 11-surface elongation will occur in the light 7 eye pa due to the weight of the rounded light 7 eye pa aggregate 110 in which the light 7 eye pa aggregate 11O exists. Therefore, in order to suppress the elongation of the optical fiber assembly 11 due to its own weight, in the invention of H, the optical fiber core wire 23 is used as a resistance support! The optical fiber assembly 11 is placed on the circumference of the optical fiber assembly 11 and held at the center by a presser tape 26 through a buffer layer 24 to prevent the optical fiber assembly 11 from slipping within the pressure-resistant pipe 12 due to its own weight. The elongation behavior with the support body 21 is integrated. Furthermore, the center support 21 is connected to the optical cable connection part and the middle m1l.
Take it to lIO box 31. With this configuration, when the national body 31 is lifted up from the seabed to repair a transmission line failure, only the outer portion of the optical cable is stretched, and the optical fiber assembly 11 is assembled together with the central support 21 without being pulled into the pressure-resistant pipe 12. The body 11 is pulled up. By pressing the optical fiber assembly 11 into the center support 21, the elongation qI# of the optical fiber assembly 11 can be strongly separated from the elongation 4I of the pressure-resistant pipe 12, and the optical fiber assembly 11 The pressure-resistant pipe 120 absorbs the elongation strain due to the weight of the AIPA assembly 11.
The elongation characteristics can be suppressed to the same level as the tensile strength wires 14 arranged around the circumference 15.

The unit length 110 of the light 7 eyeper aggregate 11 is 11, the weight is 11, the length is t, the diameter is m, and the pressure winding tape 2 is attached to the center support 210.
5, the optical fiber assembly 11 is crimped to the center support 210 and the circumference 11. The O force per unit area is P1 light 7. If the 0 JIII coefficient between the eye fiber assembly 11 and the center support 21 is expressed as □, the light In order to suppress the slip of the fiber assembly 11 with the center support 21 due to its own weight, the following relationship O is required.

#t≦wtμP (2)
The relationship of equation (2) in the case of A -0,9■ is shown in FIG.

In FIG. 7, the horizontal axis shows the friction coefficient 1, and the vertical axis shows the pressing force P. For example, j""l0XIO-"I[77m (in case of D,
P voice about 3. S Adhesion may be obtained by adhering to the support 21 with an adhesive.

As mentioned above (D The relationship between the elongation strain and the elongation strain is shown in FIG.
The buffer layer 24 is made of polypropylene, and the water depth is 40 mm.
This is a case where the strain caused by the elongation of the optical fiber 1 aggregate that occurs when a submarine cable is lowered to the seabed at 00s is measured.

Therefore, if the straightness 11A of the p center support 21 is set to 0.7 or more, the elongation strain of the optical fiber assembly 1iO can be suppressed to 0.5- or less, and the breakage due to the elongation of the optical fiber assembly 1i can be suppressed. I see that you can suppress it.

According to the structure shown in fA5111, the pressure-resistant pipe 12 is
If there is a hole in the cable, the water run in the cable can be set in a single length section of the cable (as set in the National Athletic Meet 13, 5 inches at 9 intervals, ssK).

As described above, a space 18 is provided between the optical fiber assembly 11, the pressure-resistant pipe 12, and the six levers, and the center support 21 and the optical fiber assembly 1 are
If the central support body 21 is fixed to the optical cable connecting portion or the national body 13 of the repeater, the following effects can be obtained.

U) It is possible to prevent breakage of the optical fiber and increase in optical loss in the pressure-resistant pipe shaping work 11.

(2) It becomes possible to manufacture long cables.

(To)) When laying and pulling cables, there is no risk of the Hikari 7 Aipah assembly being caught locally in the pressure-resistant pipe, thus preventing strength deterioration during local breakage of the Hikari 7 Aipah core wire.
Since it is possible to prevent stretching distortion due to the own weight of the Hikari 7 Eyepa assembly within the pressure-resistant pipe, long-term stability can be ensured.

(4) Even during on-board repair of the submarine Optical 7-IPA cable transmission line, the central support 21 is held in place at the repeater and connection parts, so the pressure-resistant pipe of the Optical 7-IPA assembly 11 is prevented due to the extension of the outer part of the cable. 12 can be prevented and repair can be carried out on board.

(5) It is possible to prevent the optical 7-eyeper assembly from being crushed due to damage during cable installation.

(6) In order to provide watertightness 1142 with a bulkhead at the connecting part in the repeater, the water running inside the cable can be determined by the cable length Kf.

1) Pressure resistant pipe 1 by enclosing powder in the fluid in the space 18 between the pressure resistant pipe 12 and the light 7 eyeper assembly 11
It can be solved by increasing the pressure resistance of 2. Enclosing powder in the fluid can prevent water running inside the cable.

[Brief Description of the Drawings] Figures 1 and 1 are cross-sectional views showing the relationship between the optical 7-eyeper aggregate, pressure-resistant layer, and tensile strength wire of a conventional submarine optical cable, and Figure 4 is a submarine cable according to the present invention. Cross-sectional view showing an embodiment of the cable part O of the optical fiber cable transmission line for use, jI5
The figure is a cross-sectional view showing an embodiment of the cable connection part of the submarine optical 7-aipa cable transmission line according to the present invention, Figure 6 is a diagram showing the relationship between the number of bends of the pressure-resistant pipe and the buckling load, and Figure 7 is the center Diagram showing an example of the relationship between the crimp turn necessary to support the weight of the Hikari 7 Eyepa assembly on the support and the coefficient of friction μ.
FIG. 8 is a diagram showing an example of the relationship between the center support 0III@ and the elongation strain of the optical 7-eyeper aggregate. 11: Optical fiber assembly, 12,126. IT. : Pressure resistant pipe, 14, t4a*14b: Tensile strength line, 1
5: Outer cover, 18: Space, 21.21m, 21b: Center support, 22: Buffer layer, 28.28m, 28b: Hikari 7 AIPA core wire, 24: Buffer layer, 25: Presser roll, 31: National polity ,
ax, as: optical fiber coupe sr,! 14m, 314
b, 41m, 41b: Pull up^as, ms: Bulkhead, 3
9: Fiber connection part. Patent applicant Takuo Kusano, agent of Nippon Telegraph and Telephone Company 1 Figure 3 b 74 Figure 7 Figure 8. . -3 Thick 8 Figure △ (mm)

Claims (1)

[Claims] An offshore optical fiber cable transmission line (11 optical 7-eyeper aggregates are housed in a pressure-resistant layer, a gap between the pressure-resistant layer and the optical fiber collector is provided, The structure has an integral flower structure with sufficient adhesion between the center support placed at the center and the optical fiber core placed around the circumference 8 of the center support to prevent any contact between the optical fiber core and the center support. and the central support fiber connection portion 4L<
This is a repeater national structure (a submarine optical 7-eye transmission line with leakage).