WO2005109063A1 - 光ファイバユニット、光ケーブル及び光ファイバの取り出し方法 - Google Patents
光ファイバユニット、光ケーブル及び光ファイバの取り出し方法 Download PDFInfo
- Publication number
- WO2005109063A1 WO2005109063A1 PCT/JP2005/008829 JP2005008829W WO2005109063A1 WO 2005109063 A1 WO2005109063 A1 WO 2005109063A1 JP 2005008829 W JP2005008829 W JP 2005008829W WO 2005109063 A1 WO2005109063 A1 WO 2005109063A1
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- WO
- WIPO (PCT)
- Prior art keywords
- optical fiber
- optical
- fiber unit
- coating resin
- unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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Classifications
-
- 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
- G02B6/4431—Protective covering with provision in the protective covering, e.g. weak line, for gaining access to one or more fibres, e.g. for branching or tapping
Definitions
- the present invention relates to an optical fiber unit incorporating an optical fiber, an optical cable, and a method for extracting an optical fiber from the optical fiber unit.
- an optical fiber is branched from an imaginary optical cable, and the optical fiber is drawn into a building on the subscriber side and wired.
- the tear string 2 is built in together with the optical fiber 1, and by pulling the tear string 2 to the side, 3 is torn and the optical fiber 1 can be pulled out from the jacket 3.
- An optical fiber unit 4 is known (for example, see Patent Document 1).
- an optical fiber unit 7 in which optical fibers 5 are joined together with a joining material 6 made of resin without being covered with a jacket is also known. (See, for example, Patent Document 2).
- Patent Document 1 Japanese published patent: JP-A-2003-4998
- Patent Literature 2 Japanese Patent Application Laid-Open No. Hei 9-197702
- the optical fiber unit 4 can tear off the fiber 3 relatively easily at the terminal by the tear string 2 and take out the optical fiber 1, but cannot take out the tear string 2 at the middle part. However, the optical fiber 1 cannot be separated.
- An object of the present invention is to provide an optical fiber unit, an optical cable, and a method for extracting an optical fiber that can easily extract and separate an optical fiber at a predetermined place when necessary. . Disclosure of the invention>
- An optical fiber unit according to the present invention is an optical fiber unit in which a plurality of optical fibers are coated with a coating resin, wherein the optical fiber unit is bent when the optical fiber unit is bent in an arbitrary direction. At least one or more optical fibers are present inside the neutral line of the bent portion, and the coating resin can be broken by deformation of the optical fiber existing inside the neutral line.
- the optical fiber unit of the present invention is an optical fiber unit in which a plurality of optical fibers are coated with a coating resin, wherein the coating resin has a Young's modulus of E (MPa), and the thickness of the coating resin is When t (mm), EX is less than 50 (MPa ⁇ mm).
- the optical fibers are provided without being twisted.
- the coating resin is made of an ultraviolet curable resin.
- the coating resin preferably has a Young's modulus of 50 OMPa or less.
- a lubricating layer may be provided between the optical fiber and the coating resin.
- the coating is broken by bending with a diameter of less than 30 mm, so that the optical fiber inside can be taken out.
- the optical fiber must have a mode field diameter of 10.0 ⁇ m or less as defined by Peterman I (Peteraiann-1) at a wavelength of 1.55 ⁇ . Is preferred.
- the coating is broken by bending with a diameter of less than 15 mm, so that the optical fiber inside can be taken out.
- the optical fiber has a mode field diameter defined by Petermann-1 at a wavelength of 1.55 m of 8.0 / im or less. preferable.
- An optical cable according to the present invention includes the optical fiber unit having the above structure.
- the method for taking out an optical fiber of the present invention is a method for taking out an optical fiber from an optical fiber unit in which a plurality of optical fibers are coated with a coating resin, wherein the optical fiber unit is bent.
- the optical fiber present in the bent neutral line, Uchikutsu J, is deformed to cut the coating resin and take out the optical fiber.
- FIG. 1 is a sectional view of the optical fiber unit according to the first embodiment.
- FIG. 2 is a side sectional view showing the optical fiber unit in a bent state.
- FIG. 3 is a cross-sectional view showing a neutral line generated when the optical fiber unit is bent.
- FIG. 4 is a side sectional view showing a state where the optical fiber is drawn out of the broken coating resin.
- FIG. 5 is a sectional view showing a modified example of the optical fiber unit according to the first embodiment.
- FIG. 6 is a cross-sectional view showing a neutral line generated when the optical fiber suite is bent.
- FIG. 7 is a cross-sectional view showing a modified example of the optical fiber unit according to the first embodiment.
- FIG. 8 is a cross-sectional view showing a neutral line generated when the optical fiber unit is bent.
- FIG. 9 is a sectional view showing a modified example of the optical fiber unit according to the first embodiment.
- FIG. 10 is a cross-sectional view showing a modified example of the optical fiber unit according to the first embodiment.
- FIG. 11 is a cross-sectional view showing a modification of the optical fiber unit according to the first embodiment.
- FIG. 12 is a cross-sectional view of the optical fiber unit according to the second embodiment.
- FIG. 13 is a side cross-sectional view of an optical fiber cutout for explaining a strain generated when the optical fiber is bent.
- FIG. 14 is a graph illustrating a strain generated when the optical fiber unit is bent.
- FIG. 15 is a sectional view showing a modified example of the optical fiber unit according to the second embodiment.
- FIG. 16 is a cross-sectional view showing a modification of the optical fiber unit I according to the second embodiment.
- FIG. 17 is a cross-sectional view showing an optical cable including the optical fiber unit according to the third embodiment.
- FIG. 18 is a cross-sectional view showing an optical cable including an optical fiber according to the third embodiment.
- FIG. 19 is a cross-sectional view showing an optical cable including the optical fiber according to the third embodiment.
- FIG. 20 is a cross-sectional view showing an optical cable including the optical fiber unit 1 according to the third embodiment.
- FIG. 21 is a cross-sectional view illustrating the structure of the optical fiber unit according to the first embodiment.
- FIG. 22 is a cross-sectional view illustrating the structure of the optical fiber unit according to the second embodiment.
- FIG. 23 is a cross-sectional view illustrating the structure of the optical fiber unit according to the third embodiment.
- FIG. 24 is a cross-sectional view illustrating the structure of an optical cable including the optical fiber unit according to the fourth embodiment.
- FIG. 25 is a cross-sectional view illustrating the structure of the optical fiber unit of Comparative Example 1.
- FIG. 26 is a cross-sectional view showing the structure of the optical fiber cut of Comparative Example 1.
- Figure 27 is a Darraf diagram showing the separation bending diameter with respect to the product of the Young's modulus of the covering tree month and the covering thickness.
- FIG. 28 is a cross-sectional view showing the structure of a conventional optical fiber cutout.
- FIG. 29 is a cross-sectional view showing the structure of a conventional optical fiber cutout.
- 11A, 11B, 11C, 11D, 11E, 11F are optical fiber units
- 12 is an optical fiber
- 13 is a coating resin
- 21A, 21B, 21 C is an optical fiber unit
- 22 is a lubrication layer
- 31 A, 31 B, 31 C, and 31 D are optical cables
- X is a neutral wire.
- FIG. 1 is a sectional view of the optical fiber unit according to the first embodiment
- FIG. 2 is a side sectional view showing the optical fiber unit in a bent state
- FIG. 3 is a neutral line generated when the optical fiber unit is bent.
- FIG. 4 is a side sectional view showing a state in which the optical fiber is drawn out of the broken coating resin.
- this optical fiber unit 11 A is composed of a plurality of optical fibers 12 in which a glass fiber composed of a core and a clad is coated with an ultraviolet curable resin by a coating resin 13 composed of an ultraviolet curable resin.
- the structure is covered.
- E Young's modulus
- t thickness
- the coating resin 13 has a Young's modulus E of 50 OMPa or less.
- the optical fiber unit 11A is disposed straight in the longitudinal direction without being twisted by the optical fiber 12 force.
- the optical fiber 12 constituting the optical fiber unit 11A is, for example, a general-purpose type having a diameter of 0.25 mm, 0.4 mm, 0.5 mm, etc.
- the optical fiber unit 11A having the above structure when it is bent in an arbitrary direction, it is the center line of the bend and at least one wire is inside the neutral # spring X where tension and compression strain do not occur.
- the structure has the optical fiber 12 described above.
- a compressive strain acts on the optical fiber 12 existing inside the neutral line X generated when the optical fiber is bent in an arbitrary direction. This causes the optical fiber 12 to meander inside the coating resin 13, but presses the coating resin 13 from the inside because it is held by the coating resin 13, as shown in FIG. Then, the coating resin 13 is broken. Therefore, the optical fiber 12 can be easily pulled out from the broken portion of the coating resin 13 and separated.
- this optical fiber unit 11A is an optical fiber having a mode diameter of 10.0 ⁇ m or less according to the definition of Petermann-I at a wavelength of 1.55 / zm.
- the coating resin 13 is broken by bending with a diameter of less than 30 mm, and the optical fiber 12 inside can be taken out.
- the optical fiber unit 12A can be extremely easily formed at a predetermined place when necessary, by simply bending the optical fiber unit 11A. Can be taken out and separated, and the workability of single-fiber separation of the optical fiber 12 can be greatly improved.
- the optical fiber 12 is disposed in a straight without being twisted, a large compressive strain is generated in the optical fiber 12 located inside the neutral line X when the optical fiber 11A is bent. As a result, the single-core separability can be further improved. Moreover, since an ultraviolet-curable resin that is easy to mold is used as the coating resin 13, the productivity of the optical fiber unit 11A can be improved, which is advantageous for mass production.
- the Young's modulus of the coating resin 13 is set to 500 MPa or less, the breakability of the coating resin 13 can be enhanced, and the single-fiber separation of the optical fiber 12 can be further improved.
- the number of the optical fibers 12 constituting the optical fiber unit, the arrangement of the optical fibers 12, the arrangement, the shape of the coating resin 13 and the like are not limited to the above examples. Hereinafter, modified examples of the optical fiber unit will be described.
- the optical fiber unit 1 IB shown in FIG. 5 is obtained by arranging a plurality of optical fibers 12 around a central optical fiber 12, and in the case of this optical fiber unit 11 B, as shown in FIG. However, when the optical fiber is bent in an arbitrary direction, at least one or more optical fibers 12 are present inside a neutral line which is the center of the bending.
- the optical fiber unit 11C shown in FIG. 7 is obtained by disposing an array of a plurality of optical fibers 12 in two tiers by shifting by about the radius of the optical fiber 12 as shown in FIG.
- the bending direction is determined by the arrangement of the optical fibers 12.
- one or more optical fibers 12 exist inside the neutral line X when bent in the bending direction determined by the arrangement of the optical fibers 12. .
- compressive strain acts on the optical fiber 12 existing inside the neutral line X, and this optical fiber 12 Presses the coating resin 13 from the inside force and breaks the coating resin 13.
- the optical fiber 12 can be easily pulled out from the broken portion of the coating resin 13 and separated.
- the cross-sectional shape of the outer periphery is not necessarily limited to a smooth shape such as a circle or an ellipse, but may be a light in which a coating resin 13 is disposed on the outer periphery, as in an optical fiber unit 11D shown in FIG.
- a cross-sectional shape having a plurality of concave portions 13a may be provided.
- the diameter of the optical fiber 12 to be disposed may be different, and a large-diameter optical fiber 12 is disposed at the center as in the optical fiber cutout 11E shown in FIG.
- a plurality of small-diameter optical fibers 12 may be provided around the large-diameter optical fiber 12.
- optical fibers 12 do not necessarily have to be in contact with each other, and the optical fibers 12 may be disposed at an interval as in the optical fiber unit 11F shown in FIG. . (Second embodiment)
- FIG. 12 is a cross-sectional view of the optical fiber unit according to the second embodiment
- FIG. 13 is a side cross-sectional view of the optical fiber unit illustrating a strain generated when the optical fiber unit is bent
- FIG. 14 is a cross-sectional view of the optical fiber unit. It is a graph explaining the distortion which arises when bending.
- a lubricant layer 22 filled with a lubricant is provided between the optical fiber 12 and the coating resin 13.
- the lubricant constituting the lubricating layer 22 for example, silicon oil / ray, paraffin oil, or the like can be used.
- the optical fiber unit 21 A when the optical fiber 12 is bent in an arbitrary direction, the optical fiber 12 slides with respect to the coating resin 13, so that the stretching and compression distortions generated in the optical fiber 12 occur over a wide range. .
- the optical fiber unit 11 A without the lubricating layer 22 (see FIG. 13 (a)
- the optical fiber unit 21 A provided with a lubricating layer 22 although locally stretched and generates compressive strain, has an optical fiber as shown in Fig. 14 (b).
- the movement of 1 2 while sliding in the coating resin 13 causes the optical fiber 12 to be stretched and compressed in the bent portion over a wide range, as shown in Fig. 14 (b). The value decreases.
- the optical fiber unit 21A when the optical fiber 12 is used for a long time without being separated into a single core and used or wound around a pobin, etc., the optical fiber is bent at the bent portion.
- the movement of 12 in the coating resin 13 in the longitudinal direction reduces the strain generated in the optical fiber 12 and prevents the coating resin 13 from being broken unnecessarily.
- the optical fiber unit 21 A When the optical fiber 12 is separated by the optical fiber unit 21 A, the optical fiber unit 21 A is bent quickly. In this way, before the optical fiber 12 gradually moves to a portion other than the bent portion, a relatively high strain is generated in the bent portion, and the coating resin 13 is pressed from the inside by the optical fiber 12, Covered tree 13 is broken. Thus, the optical fiber 12 can be easily pulled out from the broken portion of the coating resin 13 and separated.
- the optical fiber unit 21A similarly to the first embodiment, the optical fiber unit 11A is easily bent at a predetermined place when necessary.
- the optical fiber 12 can be very easily taken out and separated by only this, and the single fiber separation workability of the optical fiber 12 can be greatly improved.
- the bending of the coating resin 13 can be suppressed by bending slowly, so that the optical fiber 12 can be used for a long time without being separated from a single fiber, or It is effective when wound around bobbins and stored.
- optical fibers 12 do not necessarily have to be in contact with each other, and as shown in an optical fiber unit 21B shown in FIG.
- a lubricating layer 22 may be provided around the optical fiber 12.
- the optical fiber 12 is covered with a cylindrical coating resin 13 and a lubricating layer 22 is provided in a gap between the optical fiber 12 and the inside of the coating resin 13.
- a structure in which each optical fiber 12 can move within the cross section may be adopted. Also in this case, it is necessary to adopt a structure in which the optical fiber 12 always exists inside the neutral line when the optical fiber unit 21C is bent.
- FIGS. 17 to 20 are cross-sectional views each showing an optical cable including an optical fiber unit.
- the optical capnette 31A shown in FIG. 17 has a tension member 32 at the center, a plurality of optical fiber units 11A are arranged around the tension member 32, and the outer periphery is further covered with «33. Things.
- the optical cable 31B shown in FIG. 18 is obtained by covering a plurality of optical cables 1 and 11A with 33, and the optical cable 31C shown in FIG. A spacer 35 having a tension member 32 at the center is provided.
- the optical fiber unit 11A is housed in a groove 34 of the spacer 35, and the outer periphery thereof is covered with 3. It is a thing.
- the respective optical fiber units 11A are twisted in a spiral shape that alternately reverses, and in the optical cable 31C, the spiral portions in which the groove portions 34 alternately reverse. It is formed in a shape.
- a tension member 36 is disposed along a pair of optical fiber units 11A, and these optical fiber units 1, 11A and the tension member 36 are covered by a jacket 3.
- the notches 38 are formed on the front and back surfaces between the optical fiber units 11A.
- the optical fiber unit 11A which is extremely easy to separate the single fiber, is provided. By pulling out the optical fiber unit 11A at a predetermined place and bending the drawn optical fiber unit 11A, the optical fiber 12 can be taken out and separated very easily, and the optical fiber 12 The workability of single core separation can be greatly improved.
- the optical cables 31B and 31C use the optical fiber unit 11A which is collectively covered with the coating resin 13, the plurality of bundled optical fibers in which the optical fiber 12 is bound with a thread or the like are used.
- the bundled optical fibers do not become entangled with each other as in the case of the provided optical cable, and the handleability can be improved.
- the coating resin 13 can be marked, and the optical fiber unit 12A can be easily identified.
- the groove 34 of the spacer 35 is used.
- the jacket 37 can be easily torn at the notch 38, and the separation operation can be further facilitated.
- optical fiber units of Examples 1 to 3 corresponding to the present embodiment and the optical fiber of Example 4 were evaluated for single-core separability, and the optical fiber units of Comparative Examples 1 and 2, which did not correspond to the present embodiment.
- the single fiber separation of the optical fiber in the pit was evaluated.
- the structures and evaluation results of Examples 1 to 4 and Comparative Examples 1 and 2 are shown below.
- Optical fiber used ⁇ 0.25 mm general-purpose SM fiber core
- Optical fiber cross-section array 5 arrays around one center (see Fig. 21)
- Optical fiber cross-section array 6 arrays around one center (see Fig. 22)
- Optical fiber longitudinal direction array straight (no twist)
- Single core separability Single core separable at unit bending diameter ⁇ 25 mm
- Optical fiber used ⁇ 0.25 mm general-purpose SM fiber core
- Optical fiber cross-section array 4 arrays (see Fig. 23)
- Optical fiber unit used The optical fiber unit of Example 1 is used. Cable cross section: 9 wires are arranged around 3 wires on the center side (see Fig. 24). (In addition, an aramide fiber is placed around the optical fiber cut as a tension member.)
- Single core separability Single core separable with a bending diameter of ⁇ 5 Omm, just like unit unit
- Optical fiber used ⁇ 0.25 mm general-purpose SM fiber core
- Optical fiber cross-section array 6 arrays around one center (see Fig. 25)
- Single core separation is not possible even when the unit is bent to a diameter of ⁇ 10 mm or less.
- Optical fiber used ⁇ 0.25 mm general-purpose SM fiber core
- Optical fiber cross-section array 4 arrays (see Fig. 26)
- Single core separability Single core is easily separated, and there is difficulty in handling as a unit. Unable to withstand external forces caused by changing unit or cable.
- the Young's modulus E of the coating resin is preferably not more than 50 OMPa.
- the thickness t of the coating resin can be reduced by reducing the thickness t. It has been found that the heart can be separated.
- an optical fiber can be taken out and isolate
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
- Light Guides In General And Applications Therefor (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004141644A JP2005321734A (ja) | 2004-05-11 | 2004-05-11 | 光ファイバユニット、光ケーブル及び光ファイバの取り出し方法 |
| JP2004-141644 | 2004-05-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2005109063A1 true WO2005109063A1 (ja) | 2005-11-17 |
Family
ID=35320351
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2005/008829 Ceased WO2005109063A1 (ja) | 2004-05-11 | 2005-05-10 | 光ファイバユニット、光ケーブル及び光ファイバの取り出し方法 |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2005321734A (ja) |
| TW (1) | TW200540484A (ja) |
| WO (1) | WO2005109063A1 (ja) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4957502B2 (ja) * | 2007-10-16 | 2012-06-20 | 住友電気工業株式会社 | 光ケーブル |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01209412A (ja) * | 1988-02-17 | 1989-08-23 | Sumitomo Electric Ind Ltd | 分離型光フアイバユニツト |
| JPH0247606A (ja) * | 1988-06-30 | 1990-02-16 | American Teleph & Telegr Co <Att> | 伝送媒体の接着アレイ |
| JPH04161910A (ja) * | 1990-10-25 | 1992-06-05 | Fujikura Ltd | 多心光ファイバテープ心線 |
| JPH10160987A (ja) * | 1996-12-02 | 1998-06-19 | Sumitomo Electric Ind Ltd | 光ファイバユニットおよび光ケーブル |
-
2004
- 2004-05-11 JP JP2004141644A patent/JP2005321734A/ja active Pending
-
2005
- 2005-05-10 WO PCT/JP2005/008829 patent/WO2005109063A1/ja not_active Ceased
- 2005-05-11 TW TW094115292A patent/TW200540484A/zh unknown
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01209412A (ja) * | 1988-02-17 | 1989-08-23 | Sumitomo Electric Ind Ltd | 分離型光フアイバユニツト |
| JPH0247606A (ja) * | 1988-06-30 | 1990-02-16 | American Teleph & Telegr Co <Att> | 伝送媒体の接着アレイ |
| JPH04161910A (ja) * | 1990-10-25 | 1992-06-05 | Fujikura Ltd | 多心光ファイバテープ心線 |
| JPH10160987A (ja) * | 1996-12-02 | 1998-06-19 | Sumitomo Electric Ind Ltd | 光ファイバユニットおよび光ケーブル |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2005321734A (ja) | 2005-11-17 |
| TW200540484A (en) | 2005-12-16 |
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