US20200264393A1 - Optical Fiber Coating - Google Patents
Optical Fiber Coating Download PDFInfo
- Publication number
- US20200264393A1 US20200264393A1 US16/275,421 US201916275421A US2020264393A1 US 20200264393 A1 US20200264393 A1 US 20200264393A1 US 201916275421 A US201916275421 A US 201916275421A US 2020264393 A1 US2020264393 A1 US 2020264393A1
- Authority
- US
- United States
- Prior art keywords
- fiber
- coating layer
- gaps
- cladding layer
- optical fiber
- 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.)
- Granted
Links
- 239000013307 optical fiber Substances 0.000 title claims abstract description 21
- 239000011248 coating agent Substances 0.000 title description 14
- 238000000576 coating method Methods 0.000 title description 14
- 239000000835 fiber Substances 0.000 claims abstract description 68
- 239000010410 layer Substances 0.000 claims abstract description 37
- 239000011247 coating layer Substances 0.000 claims abstract description 35
- 238000005253 cladding Methods 0.000 claims abstract description 26
- 230000003287 optical effect Effects 0.000 claims description 4
- 238000000034 method Methods 0.000 claims 6
- 230000004927 fusion Effects 0.000 abstract description 5
- 229920000642 polymer Polymers 0.000 description 6
- 239000011521 glass Substances 0.000 description 4
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 239000004760 aramid Substances 0.000 description 1
- 229920003235 aromatic polyamide Polymers 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000007526 fusion splicing Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000011253 protective coating Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000012815 thermoplastic material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
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
- G02B6/24—Coupling light guides
- G02B6/245—Removing protective coverings of light guides before coupling
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/00663—Production of light guides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/00865—Applying coatings; tinting; colouring
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
- C03C25/10—Coating
- C03C25/104—Coating to obtain optical fibres
- C03C25/106—Single coatings
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
- C03C25/10—Coating
- C03C25/24—Coatings containing organic materials
- C03C25/26—Macromolecular compounds or prepolymers
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4479—Manufacturing methods of optical cables
- G02B6/4486—Protective covering
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/00865—Applying coatings; tinting; colouring
- B29D11/00875—Applying coatings; tinting; colouring on light guides
-
- 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 generally to the manufacture of optical fibers, and particularly to fibers on which a polymer or other protective coating is applied.
- Optical fibers are typically provided with a polymer coating that is applied to have a uniform fixed outer diameter over the length of the fiber.
- the coating protects the fibers from mechanical and chemical damage when they are deployed on site.
- the use of a completely bare (i.e., uncoated) fiber in the field is not deemed acceptable. Notwithstanding, the fiber coating can act as an impediment when the underlying bare fiber must be exposed, for example, for fusion splicing to another fiber or for termination in an optical connector.
- a typical 125 ⁇ m diameter glass fiber is usually produced with a coating having an outer diameter of either 200 ⁇ m or 250 ⁇ m. It is therefore necessary to strip away a length of the coating at one end of the fiber in order to perform a fusion splice. Installers presently use a mechanical or thermal stripper tool to perform this step, which often needs to be repeated several times since the tool removes the coating only roughly after a first pass. A special cleansing wipe must then be used to remove the remnant coating completely before the end of the fiber can be cleaved and inserted into a fusion splice machine for splicing to a similarly prepared fiber.
- Fiber recoating is also used to protect sections of optical fibers along which Fiber Bragg Gratings have been inscribed in the fiber cores. and to protect the end of a fiber from which the coating was stripped when producing a fiber laser. See U.S. Pat. Appl'n Pub. No. 2017/0168239 (Jun. 15, 2017), all relevant portions of which are incorporated by reference.
- the coating at the end of an optical fiber must also be cleanly removed in order to terminate the fiber in an optical connector. Because the fiber end must be inserted through a passage in a connector ferrule, wherein the diameter of the passage is typically only 125-126 ⁇ m, any remnant coating can prevent the fiber from being properly inserted over the length of the ferrule passage.
- a length of optical fiber includes a core, a cladding layer surrounding the core, and a coating layer applied over the cladding layer along the length of fiber for protecting the fiber.
- the coating layer is applied so that gaps of a certain width are defined intermittently in the coating layer over the length of fiber, and the gaps in the coating layer have a depth that is set to expose the cladding layer sufficiently within the gaps so that the exposed cladding layer and the surrounded core can be fusion spliced or terminated with minimal if any stripping of any remnant coating on the cladding layer within the gaps.
- FIG. 1 is a cross section of a single-mode glass optical fiber in which the present invention can be embodied
- FIG. 2 shows an example of a typical thermal stripping tool for removing a coating and any surrounding buffer layer or jacketing at an end of the optical fiber
- FIG. 3 is axial cross section of an optical fiber in which the present invention is embodied.
- FIG. 1 is a cross section of a single-mode glass optical fiber 10 in which the present invention can be embodied.
- the fiber 10 contains a central glass core 12 having a nominal diameter of 9 ⁇ m, and a surrounding glass cladding layer 14 having a nominal outside diameter (O.D.) of 125 ⁇ m.
- the fiber 10 is ordinarily provided with a protective polymer coating layer 16 having a nominal O.D. of up to 250 ⁇ m which is typically fixed over the length of the fiber 10 .
- a protective polymer coating layer 16 having a nominal O.D. of up to 250 ⁇ m which is typically fixed over the length of the fiber 10 .
- the invention can be embodied in multi-mode fibers, as well as in fibers having cores and cladding layers of various dimensions.
- thermoplastic material may be extruded directly over the coating layer 16 up to an O.D. of, e.g., 900 ⁇ m to produce a buffer layer.
- a PVC jacket may then be extruded over the buffer layer together with strength members like aramid yarn to form a fiber optic cable.
- the coated fiber 10 may be contained loosely inside a sturdy flexible tube together with strength members and a water blocking gel for outdoor applications.
- FIG. 2 shows an example of a typical thermal stripper tool 20 used by installers to remove the coating layer 16 together with a surrounding buffer layer at an end of the fiber 10 , so that the exposed cladding layer 14 together with the fiber core 12 can be fused to a similarly prepared second fiber, or terminated in an optical connector.
- Thermal stripper tools are commercially available from, e.g., OFS Fitel, LLC, cat. #1026A which features heated stripping blades to cut through the coating layer 16 and other layers that may surround the coating layer 16 of the fiber 10 .
- FIG. 3 shows an axial cross section of an optical fiber 10 ′ according to the invention.
- the coating layer 16 is applied during manufacture so that relatively short gaps 30 are defined intermittently in the coating layer 16 and in any buffer layer over the length of the fiber 10 ′.
- the remaining sections of the fiber 10 ′ retain the coating layer 16 and any surrounding layers for protection.
- the width W of each gap 30 may be one-inch, and the centers of the gaps 30 may be spaced apart by a distance S of five inches. In such a case, the coating coverage on the fiber 10 ′ is still 80 percent.
- the gap width W and spacing S may also be optimized for a given application of the fiber 10 ′.
- the width W and the spacing S of the gaps 30 should be set so that at least 50 percent of the total length of the fiber 10 ′ is protected by the coating layer 16 .
- an installer simply strips away not more than, e.g., five inches of any jacket, tube, or buffer layer from an end of the fiber 10 ′, so that at least one of the gaps 30 in the coating layer 16 is exposed along the length of the fiber 10 ′.
- the installer then cuts away the fiber 10 ′ up to a leading point P of the first exposed gap 30 , leaving a clean length W of the cladding layer 14 and the surrounded core 12 ready to fusion splice, and then to sleeve or recoat.
- no thermal or mechanical stripping tool is required.
- the installer proceeds as above and inserts the clean length W of the cladding layer 14 and core 12 into the connector ferrule without needing to strip the coating layer 16 away from the cladding layer 14 .
- the depth D of the gaps 30 may be set so that a minimal but finite amount of the coating layer 16 will remain on the cladding layer 14 of the fiber 10 ′ within each gap 30 .
- This embodiment would still make it easier to strip away the coating layer 16 within such gaps, as well as to route the fiber 10 ′ about tight bend radii and otherwise use the regions of the gaps 30 along the fiber 10 ′ to advantage.
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Ophthalmology & Optometry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Mechanical Coupling Of Light Guides (AREA)
Abstract
A length of optical fiber has a core, a cladding layer surrounding the core and a coating layer applied over the cladding layer along the fiber for protecting the fiber. The coating layer is applied so that gaps of a certain width are defined intermittently in the coating layer over the length of fiber. The gaps in the coating layer have a depth D that is set to expose the cladding layer enough within the gaps so that the exposed cladding layer and the surrounded core can be fusion spliced or terminated with minimal if any required stripping of the coating layer off of the cladding layer.
Description
- The present invention relates generally to the manufacture of optical fibers, and particularly to fibers on which a polymer or other protective coating is applied.
- Optical fibers are typically provided with a polymer coating that is applied to have a uniform fixed outer diameter over the length of the fiber. The coating protects the fibers from mechanical and chemical damage when they are deployed on site. The use of a completely bare (i.e., uncoated) fiber in the field is not deemed acceptable. Notwithstanding, the fiber coating can act as an impediment when the underlying bare fiber must be exposed, for example, for fusion splicing to another fiber or for termination in an optical connector.
- For example, a typical 125 μm diameter glass fiber is usually produced with a coating having an outer diameter of either 200 μm or 250 μm. It is therefore necessary to strip away a length of the coating at one end of the fiber in order to perform a fusion splice. Installers presently use a mechanical or thermal stripper tool to perform this step, which often needs to be repeated several times since the tool removes the coating only roughly after a first pass. A special cleansing wipe must then be used to remove the remnant coating completely before the end of the fiber can be cleaved and inserted into a fusion splice machine for splicing to a similarly prepared fiber. Once the fibers are fused to one another, the fused ends are typically sleeved or recoated with a suitable polymer for protection. Fiber recoating is also used to protect sections of optical fibers along which Fiber Bragg Gratings have been inscribed in the fiber cores. and to protect the end of a fiber from which the coating was stripped when producing a fiber laser. See U.S. Pat. Appl'n Pub. No. 2017/0168239 (Jun. 15, 2017), all relevant portions of which are incorporated by reference.
- The coating at the end of an optical fiber must also be cleanly removed in order to terminate the fiber in an optical connector. Because the fiber end must be inserted through a passage in a connector ferrule, wherein the diameter of the passage is typically only 125-126 μm, any remnant coating can prevent the fiber from being properly inserted over the length of the ferrule passage.
- According to the invention, a length of optical fiber includes a core, a cladding layer surrounding the core, and a coating layer applied over the cladding layer along the length of fiber for protecting the fiber. The coating layer is applied so that gaps of a certain width are defined intermittently in the coating layer over the length of fiber, and the gaps in the coating layer have a depth that is set to expose the cladding layer sufficiently within the gaps so that the exposed cladding layer and the surrounded core can be fusion spliced or terminated with minimal if any stripping of any remnant coating on the cladding layer within the gaps.
- For a better understanding of the invention, reference is made to the following description taken in conjunction with the accompanying drawing and the appended claims.
- In the drawing;
-
FIG. 1 is a cross section of a single-mode glass optical fiber in which the present invention can be embodied; -
FIG. 2 shows an example of a typical thermal stripping tool for removing a coating and any surrounding buffer layer or jacketing at an end of the optical fiber; and -
FIG. 3 is axial cross section of an optical fiber in which the present invention is embodied. -
FIG. 1 is a cross section of a single-mode glassoptical fiber 10 in which the present invention can be embodied. Thefiber 10 contains acentral glass core 12 having a nominal diameter of 9 μm, and a surroundingglass cladding layer 14 having a nominal outside diameter (O.D.) of 125 μm. As mentioned earlier, thefiber 10 is ordinarily provided with a protectivepolymer coating layer 16 having a nominal O.D. of up to 250 μm which is typically fixed over the length of thefiber 10. It will be understood from the present disclosure, however, that the invention can be embodied in multi-mode fibers, as well as in fibers having cores and cladding layers of various dimensions. - In addition to the
polymer coating layer 16, and as is generally known in the art, a thermoplastic material may be extruded directly over thecoating layer 16 up to an O.D. of, e.g., 900 μm to produce a buffer layer. A PVC jacket may then be extruded over the buffer layer together with strength members like aramid yarn to form a fiber optic cable. Also, instead of a buffer layer, the coatedfiber 10 may be contained loosely inside a sturdy flexible tube together with strength members and a water blocking gel for outdoor applications. -
FIG. 2 shows an example of a typicalthermal stripper tool 20 used by installers to remove thecoating layer 16 together with a surrounding buffer layer at an end of thefiber 10, so that the exposedcladding layer 14 together with thefiber core 12 can be fused to a similarly prepared second fiber, or terminated in an optical connector. Thermal stripper tools are commercially available from, e.g., OFS Fitel, LLC, cat. #1026A which features heated stripping blades to cut through thecoating layer 16 and other layers that may surround thecoating layer 16 of thefiber 10. Instructions accompanying the mentioned tool call for stripping about 7/16 to one-half inch (11 to 13 mm) of thecoating layer 16 from an end of the fiber, and wiping the exposedcladding layer 14 from the edge of thecoating layer 16 left on the unstripped fiber, toward the end of the fiber with isopropyl alcohol. Mechanical tools are also commercially available for stripping unbuffered polymer-coated fibers, e.g., item #106826886 from OFS Fitel, LLC. -
FIG. 3 shows an axial cross section of anoptical fiber 10′ according to the invention. In thefiber 10′, thecoating layer 16 is applied during manufacture so that relativelyshort gaps 30 are defined intermittently in thecoating layer 16 and in any buffer layer over the length of thefiber 10′. The remaining sections of thefiber 10′ retain thecoating layer 16 and any surrounding layers for protection. For example, the width W of eachgap 30 may be one-inch, and the centers of thegaps 30 may be spaced apart by a distance S of five inches. In such a case, the coating coverage on thefiber 10′ is still 80 percent. The gap width W and spacing S may also be optimized for a given application of thefiber 10′. Preferably, the width W and the spacing S of thegaps 30 should be set so that at least 50 percent of the total length of thefiber 10′ is protected by thecoating layer 16. - It will also be appreciated that if one or more of the
fibers 10′ are deployed in current fiber configurations, whether outside jacketed or loose tube, thefiber 10′ will be fully protected by the surrounding jacket or tube. Moreover, mechanically enhanced optical fibers are now available that can tolerate stronger pull tension and which are more durable than conventional fiber. - To splice the intermittently coated
fiber 10′, an installer simply strips away not more than, e.g., five inches of any jacket, tube, or buffer layer from an end of thefiber 10′, so that at least one of thegaps 30 in thecoating layer 16 is exposed along the length of thefiber 10′. The installer then cuts away thefiber 10′ up to a leading point P of the first exposedgap 30, leaving a clean length W of thecladding layer 14 and the surroundedcore 12 ready to fusion splice, and then to sleeve or recoat. Significantly, no thermal or mechanical stripping tool is required. Similarly, for terminating thefiber 10′ in a connector, the installer proceeds as above and inserts the clean length W of thecladding layer 14 andcore 12 into the connector ferrule without needing to strip thecoating layer 16 away from thecladding layer 14. - Also, according to the invention, the depth D of the
gaps 30 may be set so that a minimal but finite amount of thecoating layer 16 will remain on thecladding layer 14 of thefiber 10′ within eachgap 30. This embodiment would still make it easier to strip away thecoating layer 16 within such gaps, as well as to route thefiber 10′ about tight bend radii and otherwise use the regions of thegaps 30 along thefiber 10′ to advantage. - While the foregoing represents preferred embodiments of the present invention, it will be understood by persons skilled in the art that various changes, modifications, and additions can be made without departing from the spirit and scope of the invention within the bounds of the following claims.
Claims (7)
1-8. (canceled)
9. A method of splicing an optical fiber, comprising:
producing an optical fiber having:
a core;
a cladding layer surrounding the core, wherein the cladding layer has a first outer diameter (O.D.); and
a coating layer surrounding the cladding layer along the length of the fiber for protecting the fiber, wherein the coating layer has a second O.D. greater than the first O.D. of the cladding layer;
applying the coating layer so that gaps of a certain width W are defined intermittently in the coating layer over the length of the fiber, wherein the gaps in the coating layer have a depth D determined to expose the cladding layer and the surrounded core of the fiber substantially over the width of the gaps; and
splicing the cladding layer and the core of the fiber as exposed over the width of a given one of the gaps with another optical fiber, or terminating the cladding layer and the core of the fiber as exposed over the width of a given one of the gaps in an optical connector.
10. A method of splicing an optical fiber according to claim 9 , including determining the width W of each gap and a distance S by which the gaps are spaced apart from one another, so that at least 50 percent of the length of the produced fiber is protected by the coating layer.
11. A method of splicing an optical fiber according to claim 10 , wherein the width W of each gap is determined to be about one inch, and the distance S is determined to be about five inches.
12. A method of splicing an optical fiber according to claim 9 , including applying a buffer layer over the coating layer of the produced fiber, and forming the gaps through the buffer layer.
13. A method of splicing an optical fiber according to claim 9 , including providing a loose tube over the coating layer of the produced fiber, and forming the gaps through the loose tube.
14. A method of splicing an optical fiber according to claim 9 , including determining the depth D of the gaps in the coating layer of the produced fiber so that only a sufficient amount of the coating layer remains on the cladding layer within each gap to facilitate routing the fiber about tight bend radii.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US16/275,421 US10739543B1 (en) | 2019-02-14 | 2019-02-14 | Optical fiber coating |
EP20156435.8A EP3696584B1 (en) | 2019-02-14 | 2020-02-10 | Method of producing optical fiber with coating having gaps |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US16/275,421 US10739543B1 (en) | 2019-02-14 | 2019-02-14 | Optical fiber coating |
Publications (2)
Publication Number | Publication Date |
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US10739543B1 US10739543B1 (en) | 2020-08-11 |
US20200264393A1 true US20200264393A1 (en) | 2020-08-20 |
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Family Applications (1)
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US16/275,421 Active US10739543B1 (en) | 2019-02-14 | 2019-02-14 | Optical fiber coating |
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US (1) | US10739543B1 (en) |
EP (1) | EP3696584B1 (en) |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4851165A (en) * | 1987-09-02 | 1989-07-25 | American Telephone And Telegraph Company At&T Bell Laboratories | Methods of and apparatus for coating optical fiber |
JPH03186806A (en) * | 1989-12-15 | 1991-08-14 | Sumitomo Electric Ind Ltd | Method for removing coating of optical fiber |
GB2418717B (en) * | 2004-09-29 | 2009-08-12 | Miniflex Ltd | Linear member |
US10161810B2 (en) * | 2013-06-10 | 2018-12-25 | Mitsubishi Electric Corporation | Honeycomb sandwich structure and method of manufacturing honeycomb sandwich structure |
US10234631B2 (en) | 2015-12-14 | 2019-03-19 | Ofs Fitel, Llc | Preventing delamination of a coating on an optical fiber when stripping the fiber |
US10989888B2 (en) * | 2016-02-02 | 2021-04-27 | Ofs Fitel, Llc | Flexible ribbon structure and method for making |
JP6564418B2 (en) * | 2017-04-20 | 2019-08-21 | ファナック株式会社 | Optical power monitor device and laser device |
-
2019
- 2019-02-14 US US16/275,421 patent/US10739543B1/en active Active
-
2020
- 2020-02-10 EP EP20156435.8A patent/EP3696584B1/en active Active
Also Published As
Publication number | Publication date |
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EP3696584B1 (en) | 2023-08-30 |
EP3696584A1 (en) | 2020-08-19 |
US10739543B1 (en) | 2020-08-11 |
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