HK1048160B - Coated optical fiber - Google Patents
Coated optical fiber Download PDFInfo
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- HK1048160B HK1048160B HK03100159.4A HK03100159A HK1048160B HK 1048160 B HK1048160 B HK 1048160B HK 03100159 A HK03100159 A HK 03100159A HK 1048160 B HK1048160 B HK 1048160B
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Description
Technical Field
The present invention relates to a coated optical fiber, an optical fiber ribbon, and an optical fiber unit.
Background
An optical fiber is obtained by drawing an optical fiber preform having a core and a clad. To protect and reinforce the fiber and to make it flexible, and for some other purpose, a coating is formed around the outside of the glass optical fiber immediately after drawing. It is known to form at least two layers of coating, namely: a relatively soft (low young's modulus) primary coating that contacts the periphery of the glass optical fiber and has a buffer effect; and a hard (high young's modulus) secondary coating layer formed on the outermost side and having a protective effect.
For example, in Japanese patent laid-open No. Hei 9-5587, a coated optical fiber is proposed in which by setting a drawing force (a force necessary to draw a glass optical fiber from a coated optical fiber fixed at its periphery) to 90g/mm to 180g/mm, this force acts as an adhesive force between the glass optical fiber and a primary coating material forming a primary coating, thereby obtaining a sufficient adhesive force between the glass optical fiber and the primary coating material, and even if the glass optical fiber and the primary coating material are immersed in water for a long time, no partial peeling occurs between them.
However, when the drawing force corresponding to the adhesion between the glass optical fiber and the primary coating material is set to 90g/mm to 180g/mm as described in the above patent, during or after the production of the coated optical fiber: stripping sometimes occurs at the interface between the glass of the coated optical fiber and the coating material, for example during drawing to twisting into a cable or during winding onto another reel. It is believed that: minute foreign materials such as broken pieces of the optical fiber adhering to the drum on which the coated optical fiber is conveyed undergo large local deformation due to static electricity or the like, so that peeling occurs at the interface between the glass optical fiber and the primary coating.
The present invention aims to provide a coated optical fiber which can be prevented from being peeled off during the process from drawing to twisting into an optical cable.
A ribbon-like (ribbon-like) optical cable, called an "optical fiber ribbon", is formed by laying a plurality of coated optical fibers in parallel in a plane and forming an integral sheath around the coated optical fibers to coat the coated optical fibers in the sheath. When connecting optical fiber ribbons, it is necessary to collectively remove the primary coating formed around the outside of the glass optical fibers and the integral jacket. This operation is called "collective stripping of the coating". In this case, it is undesirable that a coating such as a primary coating, a secondary coating, or other coating remains on the surface of the glass optical fiber.
It is another object of the present invention to provide a coated optical fiber in which it has improved peel resistance during drawing and rewinding, and the collective peeling ability of the coating is not reduced when this coated optical fiber is used as a component of an optical fiber ribbon.
It is still another object of the present invention to provide a coated optical fiber which is assembled into an optical fiber unit of a certain type or inserted into a loose tube and undergoes peeling of a single coated fiber when connection is made, in which a peeling prevention property is increased and peeling of a single coated fiber is easy,
it is still another object of the present invention to provide an optical fiber ribbon in which the peel-off prevention property is increased and the coating layer is easily peeled off collectively; or to provide an optical fiber unit in which the peel resistance is increased and the peeling of the individual coated fibers is facilitated.
Disclosure of Invention
To achieve the above object, the present invention relates to:
(1) a coated optical fiber having at least one coating layer formed around an outer portion of a glass optical fiber, wherein a storage modulus E' at 25 ℃ and 110Hz of a primary coating layer in contact with the glass optical fiber is 0.01kg/mm2-2.0kg/mm2In the above range, the adhesion between the glass optical fiber and the primary coating is in the range of 10g/cm to 200g/cm, and the primary coating is made of an ultraviolet curable resin.
(2) The coated optical fiber according to the above (1), wherein the storage modulus E' is 0.01kg/mm2-0.5kg/mm2And the adhesion is in the range of 10g/cm to 100 g/cm.
(3) The coated optical fiber according to the above (1), wherein the storage modulus E' is 0.01kg/mm2-2.0kg/mm2And the adhesion force is in the range of 100g/cm to 200 g/cm.
(4) An optical fiber ribbon, wherein a plurality of coated optical fibers according to (1) or (2) are arranged in parallel and collectively coated with an integral resin sheath.
(5) An optical fiber unit in which a plurality of coated optical fibers according to (1) or (3) are arranged and collectively coated with an integral resin sheath.
Drawings
Fig. 1 shows the relationship between peel, storage modulus E' and adhesion (between glass and primary coating) of the primary coating, and illustrates the collective peel capability of the ribbon coating.
FIG. 2 is a schematic cross-sectional view showing an embodiment of a coated optical fiber according to the present invention.
Fig. 3 is a schematic cross-sectional view showing a structure of an optical fiber ribbon using the coated optical fiber of the present invention shown in fig. 1.
Fig. 4 shows the relationship between peel, storage modulus E' and adhesion (between glass and primary coating) of the primary coating, and shows the peel ability of the coating.
Fig. 5 is a schematic cross-sectional view showing an embodiment of an optical fiber unit using the coated optical fiber of the present invention shown in fig. 1.
Detailed Description
Regarding peeling, the present inventors found that the storage modulus E' of the primary coating and the adhesion between the glass optical fiber and the primary coating are related to the frequency of occurrence of peeling, and thus achieved the present invention.
Fig. 2 is a schematic cross-sectional view of an embodiment of the present invention. A primary coating layer 2 having a storage modulus E' of 0.01kg/mm at 25 ℃ and 110Hz is formed around the outer portion of a glass optical fiber 1 having at least a core and a cladding2-0.5kg/mm2The adhesion between the primary coating 2 and the glass optical fiber 1 is 10g/cm to 100g/cm, and the secondary coating 3 is formed around the outside of the primary coating 2, thereby constituting the coated optical fiber 4.
In the invention, based on out-of-phase sinusoidal stress S ═ S0exp[i(ωt+δ)]The storage modulus E' is obtained by calculation according to the following formula (1) when the sinusoidal strain r is r ═ r0exp (i ω t) acts as a mechanical vibration on one end of the sample, and an out-of-phase sinusoidal stress S is detected on the other end.
E*＝S/r
＝S0 exp[i(ωt+δ)]/r0 exp(iωt)
(1)
＝S0/r0·cos δ+iS0/r0·sinδ
＝E’+i·E”
Here, E*Representing complex viscoelasticity, E 'representing storage modulus, E' representing lost complex viscoelasticity, S representing stress, S0Representing the magnitude of the stress, r representing the strain, r0Denotes the magnitude of the strain, ω denotes the angular velocity, t denotes time, and δ denotes the phase shift angle.
In equation (1), δ is a function of ω. In the quasi-static state, i.e. when ω is 0, δ is 0, E ═ 0, and the storage modulus E' corresponds to the so-called young modulus.
The following explains why the storage modulus E' of the primary coating resin is used as an index in the present invention.
In the drawing of an optical fiber, a coated optical fiber is wound on a reel by a drum. When static electricity or the like causes an external material to adhere to a portion of the drum from which the optical fiber is conveyed, peeling sometimes occurs at the interface between the glass and the primary coating. Since the coated optical fiber is produced at a high speed, the drum is also rotated at a high speed, and strain is rapidly applied to the coating, i.e., at a high strain rate.
In the present case, the Young's modulus of a coating is measured on the basis of a "stress acting at a low strain rate of about 1mm/min to extend the coating by 2.5%". The young's modulus obtained from the gradient of the straight line connecting the stress corresponding to strain 0 and the stress corresponding to strain 2.5% is referred to as "2.5% secant young's modulus". From the measurement point of view, this young's modulus is used instead of the young's modulus at the initial strain of 0. However, the present inventors thought and made studies, and considered that it is appropriate to use the storage modulus E ' as an index, which is a real part of the elastic modulus in the high strain rate region, since the resin used for the primary coating layer and the like exhibits viscoelastic characteristics, contrary to using the young's modulus measured at a low strain rate such as the 2.5% secant young ' modulus in the art.
As a result, the present inventors have found that there is a relationship between the storage modulus E' at 25 ℃ and 110Hz and the peeling frequency, and this relationship can be used as an index of the elastic modulus in the high strain rate region.
In the present invention, the adhesion is expressed as: the force required to separate the primary coating 50mm from the glass sheet in the 180 direction at a draw rate of 200mm/min after the primary coating is formed on the surface of the glass sheet. A more accurate definition thereof will be provided in the following examples.
Fig. 1 is a graph showing the storage modulus E' (25 c and 110Hz) of the primary coating of the optical fiber ribbon of the present invention and the proper range of adhesion between the glass optical fiber and the primary coating, based on the results of the examples of the present invention described below. As shown in FIG. 1, the storage modulus E' at 25 ℃ and 110Hz of the primary coating was 0.01kg/mm2-0.5kg/mm2In the range of 10g/cm to 100g/cm, peeling does not occur at the interface between the glass optical fiber and the primary coating, and productivity and reliability of the coated optical fiber are improved.
When the storage modulus E' of the primary coating is less than 0.01kg/mm2When used, the primary coating is susceptible to internal cracking (cavitation) during processing. Since holes increase the transport loss, for example, in a low-temperature environment of-40 ℃, the formation of holes must be prevented.
In contrast, when the storage modulus E' in the coated optical fiber of the optical fiber ribbon exceeds 0.5kg/mm2When the coating is applied to the glass optical fiber, peeling is likely to occur at the interface between the glass optical fiber and the primary coating. It is hypothesized that when the modulus of elasticity at high strain rates is too high, the interface between the glass fiber and the primary coatingA large strain is generated, and at this time, the coated optical fiber is deformed, which may cause peeling. Particularly preferred storage moduli E' at 25 ℃ and 110Hz are those of 0.02kg/mm2-0.3kg/mm2Within the range.
Peeling at the interface can be prevented by increasing the adhesion between the glass optical fiber and the primary coating. However, when the adhesion is too large, the coating is difficult to peel off collectively when the optical fiber ribbon is attached to other glass optical fibers. Therefore, the adhesion is preferably 100g/cm or less. In contrast, when the adhesion is less than 10g/cm, peeling may occur at the interface between the glass optical fiber and the primary coating. Particularly preferably, the adhesion is in the range of 15g/cm to 75 g/cm.
Of course, not all of the fibers are ribbonized, and the fibers may be assembled into a compact unit or inserted into a loose tube. In these cases, only stripping of individual coated fibers need be considered. In this case, the storage modulus E' and the adhesion between the glass optical fiber and the primary coating can be made larger than in the above-described coated optical fiber for a fiber ribbon, which can increase the peel resistance.
Fig. 4 shows, based on the results of the embodiment of the present invention described below, a region in which the storage modulus E' of the primary coating of the coated optical fiber and the adhesion between the glass optical fiber and the primary coating are both correct, and it is possible to peel off the individual coated fibers without considering the collective peeling of the coatings.
As shown in FIG. 4, the storage modulus E' was at 0.01kg/mm even at 25 ℃ and 110Hz of the primary coating2-2.0kg/mm2In the range of 100g/cm to 200g/cm, the interface between the glass and the primary coating layer is not peeled off, and therefore, the productivity and reliability of the coated optical fiber are improved.
Storage modulus E' at 25 ℃ and 110Hz of less than 0.01kg/mm2When the primary coating layer is treated, internal cracking (cavitation) may occur, and the transport loss tends to increase at low temperatures. When the storage modulus E' exceeds 2.0kgmm2In this case, peeling may occur at the interface between the glass optical fiber and the primary coating.
As shown in FIG. 1, although an adhesion of 10g/cm at the minimum between the glass optical fiber and the primary coating is satisfactory, in the case where only the peeling ability to peel off a single coated fiber is considered, since the peeling resistance is increased, the adhesion is preferably 100g/cm or more. When the adhesion force exceeds 200g/cm, it is difficult to peel off the single coated fiber in the case of connecting the optical fiber to another optical fiber.
In the present invention, the composition, structure and production method of the glass optical fiber itself are not particularly limited and may be the same as those known in the art.
In the present invention, it is only necessary that the coating material of the primary coating layer satisfies the storage modulus E' and the adhesion of the present invention. Although the coating material is, for example: methacrylic resins such as urethane methacrylic resins, polybutadiene methacrylic resins, polyether methacrylic resins, polyester methacrylic resins or epoxy methacrylic resins; an unsaturated polyester; a cationically polymerized epoxy resin; a propylene-based compound resin; or an ultraviolet curable resin including the above resin mixture, but the coating material is not limited thereto. These resins may be composite resins containing various ingredients, and, for example, various reaction monomers, polymerization initiators, and various additives such as chain transfer agents, antioxidants, light stabilizers, plasticizers, silane coupling agents, polymerization inhibitors, photosensitizers, and lubricant additives may be added thereto, if necessary. In the present invention, the resin and the composite resin are generally collectively referred to as "resin".
For the primary coating of the present invention, it is necessary to select a material whose storage modulus E' and adhesion to the glass optical fiber are both within the ranges specified above in the present invention.
The storage modulus E' of the primary coating can be adjusted by the polyether molecular weight in the oligomer constituting the resin backbone and the kind of reactive diluent monomer, wherein the resin is used as the coating material. That is, the storage modulus E' can be increased by, for example, decreasing the molecular weight of the polyether, increasing the mixing amount of the multifunctional monomer, or selecting a high hardness monomer.
Also, the storage modulus E' can be increased by making the composite contain a large number of portions of high-hardness benzene rings and the like.
The adhesion between the glass optical fiber and the primary coating can be adjusted by changing the content of the adhesive monomer in the coating material used as the primary coating and the addition ratio (including 0) of the silane coupling agent. The adhesive monomers are, for example, isophorol acrylate, acrylamide, N-vinylpyrrolidone or acryloylmorpholine.
Although the secondary coating layer and the subsequent coating layer formed around the outside of the primary coating layer are not particularly limited in the present invention, it is preferable that these coating layers have a Young's modulus higher than that of the primary coating layer and function as a protective layer, and that these coating layers have a Young's modulus of, for example, 50kg/mm2-150kg/mm2. Although resins similar to the primary coating layers can be used as the material of these coating layers, colored optical fibers can be formed by, for example, adding a colorant to the outermost layer.
There is no limitation on the method of forming the coating layer such as the primary coating layer and the secondary coating layer immediately after drawing the optical fiber, and this method may be the same as the method known in the art. For example, in the case of an energy curing resin that is hardened, for example, with heat or light, a coating layer is formed by curing a coating material with radiation of corresponding energy. The use of the ultraviolet curable resin has an advantage of shorter curing time.
In the present invention, in the case where the coated optical fiber is further provided with an integral sheath so as to form an optical fiber ribbon, the peeling on the production line is reduced, and the collective peeling property of the coating of the product of the present invention is improved as compared with the conventional product.
Fig. 3 is a schematic cross-sectional view showing an embodiment of an optical fiber ribbon 8, in which the optical fiber ribbon 8 is formed by arranging a plurality of colored fibers 6 in parallel and collectively coating the colored fibers 6 with an integral sheath 7, and in each colored fiber 6, a colored layer 5 is formed around the outside of the coated optical fiber 4 shown in fig. 2.
In general, for example, it is similar to the primary coating and the secondary coating, and its Young's modulus is, for example, about 50kg/mm2-150kg/mm2The ultraviolet curable resin of (1) is used as an integral sheath material of the optical fiber ribbon. The sheath is formed by known methods.
Fig. 5 shows a specific example of the structure of the optical fiber unit 11, in which the optical fiber unit 11 is formed by bundling a plurality of colored fibers 6, the colored layer 5 is formed around the outside of each coated optical fiber 4, each coated optical fiber 4 surrounds the central tension member 12, and the colored fibers 6 are collectively coated with the integral sheaths 9 and 10. Various other configurations are known in addition to those shown above. The material of the integral jacket may be a resin similar to the optical fiber ribbon described above. The sheath is formed by a known method.
Examples
Although the embodiments of the present invention are described in detail below, the present invention is not limited thereto.
(examples 1 to 4, comparative examples 1 to 4 and comparative examples 1 'to 4')
When producing a two-layer coated optical fiber in which a primary coating layer is formed around the outside of a silica glass optical fiber having an outer diameter of 125 μm to obtain an outer diameter of 200 μm, and a secondary coating layer is formed around the primary coating layer to obtain an outer diameter of 240 μm, a relatively soft photo-hardenable urethane acrylic resin is used as a material of the primary coating layer, and a relatively hard photo-hardenable urethane acrylic resin is used as the secondary coating layer.
In order to adjust the adhesion, resins containing polar monomers (such as acrylamide, N-vinylpyrrolidone or acryloylmorpholine) or silane coupling agents in various proportions are prepared as primary coating materials.
First, a test was performed to measure the storage modulus E' of the primary coating material and its adhesion to glass, which is the same material as the glass optical fiber.
Regarding the measurement of the storage modulus E', each of the primary coating materials was formed into a sheet shape and conducted at 1000mJ/cm in a nitrogen atmosphere with a mercury lamp (metal chloride lamp M015-L312 manufactured by Eye Graphics)2Ultraviolet light irradiation [ the amount of ultraviolet light was measured by using UV-M10 (spectral photosensitivity UV-35) manufactured by Ohku Seisakusho]Thus, a sheet having a thickness of 200 μm was obtained. A specimen 4mm wide, 20mm long and 200 μm thick was cut out from this piece, and the storage modulus E' of the specimen was measured at a frequency of 110Hz with a vibration displacement of 0.016mm using Rheo-Vibron (manufactured by Orientic Corporation) as an elastometer.
Adhesion was measured in the following order:
(1) a quartz glass plate (200 mm. times.150 m) was immersed in sulfuric acid for 5 minutes or more to clean the surface.
(2) The resin liquid for forming the primary coating was applied to the cleaned quartz glass plate, and the coating was carried out by using the same mercury lamp as described above at 100mJ/cm2Is irradiated with ultraviolet light, thereby being cured. Thus, a test piece was obtained in which the cured resin layer was 200 μm thick, 50mm wide and 170mm long.
(3) The obtained sample was placed in an atmosphere of 50% RH at 25 ℃ for up to one week.
(4) Then, the resin layer of each sample was peeled off by 50mm from the quartz glass plate at a pulling rate of 200mm/min in a 180 ° direction. The maximum force (g/cm, per unit width) required in this case is defined as the adhesion between the glass optical fiber and the primary coating resin, and is considered as the adhesion between the glass optical fiber and the primary coating, wherein the glass optical fiber is made of the same material.
A primary coating was formed around the outside of a silica glass optical fiber having an outer diameter of 125 μm to obtain an outer diameter of 200 μm, and a secondary coating was formed around the primary coating to obtain an outer diameter of 240 μm. The primary coating layers were formed to have various combinations of adhesion to glass optical fibers and storage modulus E ' as shown in table 1, table 1 is based on the results of the above tests, and in order to cure the primary coating layers and the secondary coating layers, coated optical fibers were produced at a drawing speed of 200m/min using a UV furnace F-10 manufactured by Fusion UV Systems, inc. (examples 1-4, comparative examples 1-4, and comparative examples 1 ' -4 ').
Test and evaluation of the Presence or absence of peeling and occurrence of voids (internal cracking of coating)
After production, the coated optical fiber was unwound from the reel and immersed in a matching oil whose refractive index was adjusted to be the same as that of the coating (observation of the interface between the glass optical fiber and the coating was impossible if not immersed in the matching oil), and observed from the side of the coated optical fiber at a magnification of 50X with an optical microscope. It is acceptable to specify a case in which neither cavitation nor peeling occurs.
Evaluation of the collective Peel Property of the coating
A fiber tape was produced from the obtained coated optical fiber, and the coating of the fiber tape was collectively peeled off by a hand and heat remover JR-4A (trade name, manufactured by sumitomo electric appliances industries, ltd.). It is acceptable to specify that the coating can be removed from the surface of the glass optical fiber at a heating temperature of 90 ℃. When the adhesion at the interface between the glass optical fiber and the coating is too large, the coating cannot be peeled off from the glass optical fiber.
The above results are shown in table 1 and fig. 1.
TABLE 1
| Test specimen | E′(kg/mm2) | Adhesion (g/cm) | Side observation results | Collective strippability of optical fiber ribbons | |
| Peeling off | Cavities of the wafer | ||||
| EXAMPLE 1 COMPARATIVE EXAMPLE 1' | 0.0110.0110.008 | 11711 | Whether or not there is | Whether or not there is | ○○○ |
| Example 2 comparative example 2' | 0.40.40.55 | 15825 | Without or without the presence of | Nothing or nothing | ○○○ |
| Example 3 comparative example 3' | 0.010.0080.011 | 10085110 | Nothing or nothing | Whether or not there is | ○○× |
| EXAMPLE 4 COMPARATIVE EXAMPLE 4' | 0.50.610.46 | 9380108 | Whether or not there is | Nothing or nothing | ○○× |
In FIG. 1, the horizontal axis represents the storage modulus E' (kg/mm)2) The vertical axis represents adhesion (g/cm) between glass and primary coating, ". o" indicates correct adhesion (no peeling, no voids, and good coating collective peeling ability) in the examples of the invention, ". x" indicates peeling, "+" indicates voids, and "□" indicates failure of the fiber coated collective peeling. In the drawing, the diagonally shaded area indicates the region where both the storage modulus E' and the adhesion force are correct. The figures show that when both the storage modulus E' and the adhesion are within the range of the present invention, no peeling and cavitation occur, and the collective peeling ability of the coating is high.
(examples 5 to 9 and comparative examples 5 to 6)
Coated optical fibers were produced in a similar manner to example 1 described above, wherein the storage modulus E' and the adhesion between the glass and the primary coating were different as shown in table 2 (examples 5 to 9 and comparative examples 5 to 6). The obtained coated optical fiber was subjected to stripping and cavitation tests in a similar manner to example 1, and further, the coating stripping ability thereof was evaluated as follows. The measurement and evaluation results are shown in table 2 and fig. 4.
Evaluation of coating peeling ability:
the coating of the coated optical fiber was stripped off with a coating stripper "No-Nick NN 203" (trade name, manufactured by Clauss Inc.). It is difficult to specify the stripping of individual coated fibers in the case where the coating cannot be stripped from the glass optical fiber, such cases being marked with an "x" in table II. In table II, ". smallcircle" means that peeling of individual covered fibers is easy.
Watch (A)2
| Test specimen | E′(kg/mm2) | Adhesion (g/cm) | Side observation results | Collective strippability of optical fiber ribbon coatings | |
| Peeling off | Cavities of the wafer | ||||
| Example 5 example 6 example 7 example 8 example 9 | 2.01.80.50.030.02 | 150110190100140 | None, none | None, none | ○○○○○ |
| Comparative example 5 comparative example 6 | 5.00.2 | 120215 | Presence or absence of | None is none at all | ○× |
In fig. 4, sitting horizontallyThe axis represents the storage modulus E' (kg/mm)2) The vertical axis represents the adhesion (g/cm) between the glass and the primary coating, ". smallcircle" indicates correct adhesion (no peeling, no voids, and good coating peeling ability) in the example of the present invention, ". xx" indicates that peeling occurred, and "□" indicates that peeling failure of the individual coated fibers of the coated optical fiber occurred. In the drawing, the diagonally shaded area indicates the region where both the storage modulus E' and the adhesion force are correct. The figures show that when both the storage modulus E' and the adhesion are within the range of the present invention, no peeling and cavitation occur and the peeling ability of the coating is high.
Industrial applicability of the invention
As described above, according to the present invention, the peel resistance of the coated optical fiber is increased, the problem of peeling during the drawing and winding processes can be solved, and the occurrence of voids in the coating layer is prevented. Thereby improving the productivity and quality of the coated optical fiber.
In the optical fiber ribbon using the coated optical fiber of the present invention, the collective stripping ability of the coating is improved, and the working efficiency is improved when, for example, other optical fibers are connected.
Since the optical fiber unit using the coated optical fiber of the present invention has high peel resistance and allows easy peeling of a single coated fiber, the working efficiency is improved when, for example, another optical fiber is connected.
Claims (5)
1. A coated optical fiber having at least one coating layer formed around an outer portion of a glass optical fiber, wherein a storage modulus E' at 25 ℃ and 110Hz of a primary coating layer in contact with the glass optical fiber is 0.01kg/mm2-2.0kg/mm2In the above range, the adhesion between the glass optical fiber and the primary coating is in the range of 10g/cm to 200g/cm, and the primary coating is made of an ultraviolet curable resin.
2. The coated optical fiber according to claim 1, wherein the storage modulus E'At 0.01kg/mm2-0.5kg/mm2And the above adhesion is in the range of 10g/cm to 100 g/cm.
3. The coated optical fiber according to claim 1, wherein the storage modulus E' is 0.01kg/mm2-2.0kg/mm2And the above adhesion force is in the range of 100g/cm to 200 g/cm.
4. An optical fiber ribbon, wherein a plurality of coated optical fibers as claimed in claim 1 or 2 are arranged in parallel and collectively coated with an integral resin sheath.
5. An optical fiber unit in which a plurality of coated optical fibers as claimed in claim 1 or 3 are arranged and collectively coated with an integral resin sheath.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31513199 | 1999-11-05 | ||
| JP11/315131 | 1999-11-05 | ||
| PCT/JP2000/007756 WO2001035143A1 (en) | 1999-11-05 | 2000-11-02 | Coated optical fiber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| HK1048160A1 HK1048160A1 (en) | 2003-03-21 |
| HK1048160B true HK1048160B (en) | 2004-12-31 |
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