US20160011392A1 - Armored fiber optic assemblies and methods of forming fiber optic assemblies - Google Patents
Armored fiber optic assemblies and methods of forming fiber optic assemblies Download PDFInfo
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- US20160011392A1 US20160011392A1 US14/863,639 US201514863639A US2016011392A1 US 20160011392 A1 US20160011392 A1 US 20160011392A1 US 201514863639 A US201514863639 A US 201514863639A US 2016011392 A1 US2016011392 A1 US 2016011392A1
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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
- G02B6/4479—Manufacturing methods of optical cables
- G02B6/4486—Protective covering
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4429—Means specially adapted for strengthening or protecting the cables
- G02B6/443—Protective covering
Definitions
- the present disclosure relates generally to optical fiber assemblies, and in particular relates to armored fiber optic assemblies having dielectric armor.
- Fiber optic cables and assemblies should preserve optical performance when deployed in the intended environment while also satisfying any other requirements for the environment.
- Indoor cables for riser and/or plenum spaces may require certain flame-retardant ratings as well as mechanical requirements.
- Mechanical characteristics such as crush performance, permissible bend radii, and temperature performance in part determine how installation and use of the cable in the installation space affect optical performance of the cable.
- an armored fiber optic assembly comprises a fiber optic assembly having at least one optical fiber and a dielectric armor surrounding the fiber optic assembly.
- the dielectric armor comprises an inner dielectric layer surrounding the fiber optic assembly, and an outer dielectric layer wound around the inner layer and bonded thereto.
- an armored fiber optic assembly comprises a fiber optic assembly having at least one optical fiber and a dielectric armor surrounding the fiber optic assembly.
- the dielectric armor comprises an inner dielectric layer spirally wound around the fiber optic assembly, wherein the outer layer has the shape of a strip; and an outer dielectric layer surrounding the inner layer and bonded thereto, wherein the outer layer has an armor profile.
- a method of forming an armored fiber optic assembly comprises providing a fiber optic assembly comprising at least one optical fiber, extruding an inner layer of a dielectric armor around the fiber optic assembly, wherein extruding the inner layer comprises diverting a flow of an inner extrusion material with a first profiling feature to form a spiral strip, and extruding an outer layer of the dielectric armor around the inner layer from an outer extrusion material that is less rigid than the inner extrusion material, wherein the outer layer becomes at least partially bonded to the inner layer.
- a method of forming an armored fiber optic assembly comprises providing a fiber optic assembly comprising at least one optical fiber, extruding a first layer of a dielectric armor around the fiber optic assembly, wherein extruding the first layer comprises diverting a flow of a first extrusion material with a first profiling feature rotating in a first direction, and extruding a second layer of a dielectric armor around the fiber optic assembly, wherein extruding the second layer comprises diverting a flow of an second extrusion material with a second profiling feature rotating in a second direction.
- FIG. 1 is a perspective view of a first example embodiment of an armored fiber optic assembly having a dielectric armor.
- FIG. 2 is a schematic cross-sectional view of an explanatory extrusion system for making armored fiber optic assemblies.
- FIG. 3 is a perspective view of a second example embodiment of an armored fiber optic assembly.
- FIG. 4 is a schematic cross-sectional view of an explanatory extrusion system for making armored fiber optic assemblies.
- FIG. 5 is a perspective view of a third example embodiment of an armored fiber optic assembly.
- FIG. 6 is a perspective view of a portion of an extrusion die that can be used to form the fiber optic assembly of FIG. 5 .
- FIG. 7 is a perspective view of a fourth example embodiment of an armored fiber optic assembly.
- FIG. 1 is a perspective cut-away view of an armored fiber optic assembly 120 including a core fiber optic assembly 30 disposed within a dielectric armor 150 .
- the dielectric armor 150 is non-conductive and has an outer surface 152 that includes an armor profile 154 generally formed in a spiral along a longitudinal axis.
- armor profile means that the outer surface has an undulating surface along its length that looks similar to conventional metal armors (i.e., a undulating shape along the length of the armor).
- the dielectric armor 150 is advantageous in that it both provides crush resistance and recovers to assume its original shape when subjected to crush loads.
- the dielectric armor 150 may also meet flame and/or smoke ratings, and does not require electrical grounding.
- the dielectric armor 150 includes an inner layer 162 and an outer layer 164 disposed on the outer surface of the inner layer 162 .
- the inner layer 162 can have the shape of a spiral “strip” that winds around the core fiber optic assembly 30 .
- the outer layer 164 can be a continuous cover or coating over the exterior of the inner layer 162 .
- the inner layer 162 can be more rigid than the outer layer 164 . Accordingly, the Shore D hardness of the inner layer 162 can be more than the Shore D hardness of the outer jacket layer 164 .
- An inner surface 166 of the inner layer 162 may also have an armor profile.
- the outer layer 164 has a “continuous annular cross-section”.
- continuous annular cross-section means there are no spiral grooves, openings, or slits that cut entirely through the layer 164 .
- the exemplary inner layer 162 has the form of a strip wound around the core fiber optic assembly 30 .
- the outer layer 164 can be extruded directly onto the inner layer 162 so that the two layers are bonded or adhered together.
- the inner layer 162 may be constructed of a relatively rigid polymer, while the outer layer 164 can be relatively less rigid. The relatively rigid inner layer 162 accordingly provides tensile strength, resistance to crush, and other robust properties.
- the armored fiber optic assembly 120 can be relatively flexible and easy to bend.
- the thickness, width, and composition of the “strip” that forms the inner layer 162 can be selected to provide desirable mechanical properties.
- the outer layer 164 completely covers the inner layer 162 .
- the fiber optic assembly 30 is housed within and protected by the dielectric armor 150 .
- the fiber optic assembly 30 is a fiber optic cable having an extruded polymer cable jacket 90 and a plurality of tight-buffered optical fibers 94 extending longitudinally through the assembly 120 within the cable jacket 90 .
- Strength elements (not shown), such as aramid fibers, may also extend longitudinally through the cable jacket 90 .
- the cable jacket 90 can be omitted.
- the armor 150 can be formed by coextrusion methods.
- the extrudate materials for the respective layers enter the extrusion tooling together, and may become strongly bonded together as the two extrudate materials solidify.
- the armor 150 can be essentially a unitary one-piece armor of two strongly bonded polymer materials, with a cross-section of the armor shown in U.S. application Ser. No. 12/748,925, filed Mar. 29, 2010 and published as U.S. 2010/0260459, and may have the same or similar values for pitch, band thickness and other dimensions.
- FIG. 2 is a close-up, partial cross-sectional schematic view of an explanatory crosshead 204 used to armor fiber optic assemblies, as viewed in the Y-Z plane, that can be used to form the inner spiral layer 162 of the assembly shown in FIG. 1 .
- the crosshead 204 includes a tip 248 having a central channel 250 with an output end 252 and in which is arranged a profile tube 260 having an outer surface 261 , an inner surface 262 that defines a tube interior 263 , a proximal (output) end 264 , and a distal end 265 .
- a profiling feature 270 is located on outer surface 261 at output end 252 .
- the profiling feature 270 is a protrusion such as a nub or a bump.
- the profile tube interior 263 is sized to accommodate the fiber optic assembly 30 as it advances axially through the interior 263 .
- the profile tube distal end 265 is centrally engaged by a gear 274 that, in turn, is driven by a motor (not shown) in a manner such that the profile tube 260 rotates within channel 250 .
- the crosshead 204 further includes a die 278 arranged relative to the tip 248 to form a cone-like material channel 280 that generally surrounds the central channel 250 and that has an output end 282 in the same plane as channel output end 252 .
- the material channel 280 is connected to the extruder interior 201 so as to receive extrusion material 232 therefrom and through which flows the extrusion material during the extrusion process to form the inner spiral layer 162 .
- a profile tube output end 265 extends beyond the channel output end 252 such that the profiling feature 270 thereon resides adjacent material channel output end 282 .
- the profile tube 260 and the tip 248 are integrated to form a unitary, one-piece tool.
- extrusion material flows through the material channel 280 and out of the material channel output end 282 .
- the fiber optic assembly 30 is fed through the profile tube interior 263 and out of profile tube output end 864 (and thus through the tip 248 and the die 278 ).
- the profile tube 260 is rotated via the gear 274 so that profiling feature 270 redirects (i.e., shapes) the flow of the extrusion material as it flows about fiber the optic assembly 30 .
- the circular motion of the profiling feature 270 diverts the flow of extrusion material.
- the combined motion of the profiling feature 270 and the linear motion of fiber optic assembly 30 forms the spiral strip 162 .
- the speed at which profile tube 260 rotates relative to the motion of fiber optic assembly 30 (which may also be rotating) dictates the pitch of the spiral strip 162 .
- the axial position of the profiling feature 270 in relation to the material channel output end 282 can be varied as the feature rotates in order to, for example, form varying gaps between adjacent portions of the spiral strip 162 .
- a second, conventional extrusion head (not shown) can be arranged downstream and adjacent to the assembly shown in FIG. 2 .
- the second extrusion head can apply a continuous outer jacket layer of non-conductive polymer material over the spiral strip inner layer 162 .
- FIG. 3 is a perspective cut-away view of an armored fiber optic assembly 320 including a core fiber optic assembly 30 disposed within a dielectric armor 350 .
- the dielectric armor 350 is non-conductive and has an outer surface 352 that includes an armor profile 354 generally formed in a spiral along a longitudinal axis.
- the dielectric armor 350 is advantageous in that it both provides crush resistance and recovers to assume its original shape when subjected to crush loads.
- the dielectric armor 350 may also meet flame and/or smoke ratings, and does not require electrical grounding.
- the dielectric armor 350 includes an inner layer 362 and an outer layer 364 disposed on the outer surface of the inner layer 362 .
- the outer layer 364 can have the shape of a spiral “strip” that winds around the exterior of the inner layer 362 .
- the inner layer 362 can be less rigid than the outer, spiral layer 364 .
- the Shore D hardness of the inner layer 362 can be less than the Shore D hardness of the outer jacket layer 364 .
- An inner surface 366 of the inner layer 362 may also have an armor profile.
- the inner layer 362 has a continuous annular cross-section.
- the exemplary outer layer 364 has the form of a strip wound around the inner layer 362 so that portions of the inner layer 362 are visible.
- the outer layer 364 can be extruded directly onto the inner layer 362 so that the two layers are bonded or adhered together.
- the outer layer 364 may be constructed of a relatively rigid polymer, while the inner layer 362 can be relatively less rigid.
- the relatively rigid outer layer 364 accordingly provides tensile strength, resistance to crush, and other robust properties.
- the armored fiber optic assembly 320 can be relatively flexible and easy to bend.
- the thickness, width, and composition of the “strip” that forms the outer layer 364 can be selected to provide desirable mechanical properties.
- the outer layer 364 covers at least one quarter of the surface area of the inner layer 362 .
- the fiber optic assembly 330 is housed within and protected by the dielectric armor 350 .
- the fiber optic assembly 330 can be similar to the core assembly 30 shown in FIG. 1 , and may be separated from the core assembly 330 by a free space or separation distance.
- the outer layer 364 could cover the entirety of the inner layer 362 .
- the inner layer 362 can have the form of a spiral strip wound around the fiber optic assembly, with the outer layer 364 filling in gaps in the wound strip, as well as covering the exterior of the inner layer 364 .
- the outer layer 364 can be less rigid than the inner layer 362 so that the resultant armored assembly has desirable bend properties.
- the armor 350 can be interlocked spirals wound in the same direction.
- the armor 350 comprised of the two interlocked spirals, would have a continuous annular cross section.
- the interlocked spirals can have a continuous annular cross section with an armor profile.
- the armor 350 can be formed by coextrusion methods. For example, the extrudate materials for the respective layers enter the extrusion tooling together, and may become strongly bonded together as the two extrudate materials solidify.
- the armor 350 can be essentially a unitary one-piece armor of two strongly bonded polymer materials, with a cross-section of the armor shown in U.S. application Ser. No. 12/748,925, filed Mar. 29, 2010, and may have the same or similar values for pitch, band thickness and other dimensions.
- FIG. 4 is a perspective view of an explanatory extrusion apparatus 400 , that can be used to form the inner and outer armor layers.
- the extrusion apparatus 400 includes a first extrusion head 404 and a second extrusion head 406 that can be arranged end-to-end with the first head 404 .
- the first extrusion head 404 includes a profiling feature 470 that can rotate in order to form varying gaps in a flow of extrudate to form a spiral strip. In such an application, the first extrusion head 404 would typically form the inner armor layer. Therefore, in the arrangement of FIG. 4 , the fiber optic assembly shown in FIG.
- the illustrated second extrusion head 406 does not include a profiling feature and can be conventional in form and operation.
- the extrusion apparatus 400 can be modified to form the fiber optic assembly 320 as shown in FIG. 3 .
- both the first extrusion head 404 and the second extrusion head 406 would be equipped with profiling features.
- the first extrusion head 404 would form the inner layer 362 with a continuous armor profile.
- the second extrusion head 406 would form the outer, spiral strip layer 364 over the continuous inner layer 362 by interrupting the flow of extrudate to form a spiral strip over the inner layer.
- the extrusion apparatus 400 is shown as two separate heads 404 , 406 , it could be combined as a single, “coextrusion” head that is capable of forming two or more dielectric layers.
- FIG. 5 is a perspective cut-away view of an armored fiber optic assembly 520 including a core fiber optic assembly 30 disposed within a dielectric armor 550 .
- the dielectric armor includes a tubular portion 552 and a pair of rod-like elongated rails 554 extending along each side of the armor 550 .
- the tubular portion 552 has an outer surface 562 having an armor profile 564 generally formed in a spiral along a longitudinal axis.
- An inner surface 566 of the armor 550 may also have an armor profile.
- the armor 550 has a continuous annular cross-section.
- the tubular portion 552 is illustrated as comprising a single layer of dielectric material.
- the tubular portion 552 can be similar in cross-section to the armor shown in U.S. application Ser. No. 12/748,925, filed Mar. 29, 2010, and may have the same or similar values for pitch, band thickness and other dimensions.
- the inclusion of the rails 554 provides increased tensile strength, allowing reduced thickness of the tubular portion 552 .
- the rails 554 are shown as having rectangular sections on the sides of the rails distal to the armor center. Other cross-sections, however, such as curved, oval, arcuate, etc. may also be used for the elongate rails 554 .
- FIG. 6 is a close-up, partial cross-sectional schematic view of an explanatory profiling die 602 .
- the die 602 can be used in place of the die 278 ( FIG. 2 ), for example, to form the elongate rails 554 of the armored fiber optic assembly 520 .
- the channels 608 on either side of the die 602 allow additional extrudate to flow on the sides of the armor to form the elongate rails.
- the rails need not be continuous, and can be interrupted so that a series of rails are attached to the tubular portion. All or some rails could alternatively be located on the inside of the tubular portion 552 .
- FIG. 7 is a perspective cut-away view of an armored fiber optic assembly 720 including a core fiber optic assembly 30 disposed within a dielectric armor 750 .
- the dielectric armor includes a first spiral portion 752 and a second spiral portion 754 that are wound in opposite directions and that intersect one another.
- the spiral portions 752 , 754 have the form of spirally round flat strips of generally rectangular cross section.
- the counterwound spiral form of the armor 750 provides flexibility to the armor that also prevents the spiral portions 752 , 754 from collapsing onto the core assembly 30 .
- the armor 750 need not be secured to the core assembly 30 and may be separated from the core assembly 30 by a free space or separation distance.
- the armor 750 includes generally diamond shaped, curved openings 760 through which the core assembly is visible.
- This armor 750 can be formed by two counterrotating profiling projections.
- both extrusion crossheads 404 , 406 could be provided with profiling features arranged to form spiral strips that rotate in opposite directions and overlap.
- the openings 760 can be formed in the armor by intermittently blocking the flow of extrudate.
- the core fiber optic assemblies 30 , 330 discussed in the context of the above-described embodiments may be a stranded tube cable, monotube cable, micromodule cable, slotted core cable, loose fibers, tube assemblies, or the like.
- fiber optic assemblies according to the present embodiments can include any suitable components such as water-blocking or water-swelling components, flame-retardant components such as tapes, coatings, or other suitable components.
- the fiber optic assembly 30 may have any suitable fiber count such as 6, 12 or 24-fiber MIC® cables available from Corning Cable Systems of Hickory, N.C.
- the core assemblies shown in the present embodiments can be separated from the interior surface of the armor by a median separation in the range of about 0.1-1.5 millimeters. Alternatively, the armor can be relatively tightly conforming to the surface of the core assembly.
- the embodiments discussed above may describe specific materials for assembly components to meet desired mechanical and burn characteristics.
- the armored fiber optic assemblies may be flame-retardant and may have a desired flame-retardant rating depending on the intended space, such as plenum-rated, riser-rated, general-purpose, low-smoke zero-halogen (LSZH), or the like.
- LSZH low-smoke zero-halogen
- Suitable polymer materials for the armors may be selected from one or more of the following materials to meet the desired rating: polyvinyl chloride (PVC), polyvinylidene fluoride (PVDF), flame-retardant polyethylene (FRPE), chlorinated polyvinyl chloride (CPVC), polytetraflourethylene (PTFE), polyether-ether keytone (PEEK), Fiber-Reinforced Polymer (FRP), low-smoke zero-halogen (LSZH), polybutylene terephthalate (PBT), polycarbonate (PC), polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PETE), and acrylonitrile-butadiene-styrene (ABS).
- PVC polyvinyl chloride
- PVDF polyvinylidene fluoride
- FRPE flame-retardant polyethylene
- CPVC chlorinated polyvinyl chloride
- CPVC chlorinated polyvinyl chloride
- PVCs available from Teknor Apex under the tradenames FG RE 8015A, 8015B and 8015D may also be used.
- the terms “polymer” and “polymeric” indicate materials comprised primarily of polymers, but allow for the inclusion of non-polymer additives and other materials, such as fire-retardant compounds, etc., and the inclusion of multiple polymers in a blend.
- the term “polymer” is intended to encompass copolymers, for example.
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Abstract
Cables have dielectric armors with armor profiles that provide additional crush and impact resistance for the optical fibers and/or fiber optic assembly therein, while retaining flexibility to aid during installation. The armored cables recover substantially from deformation caused by crush loads.
Description
- This application is a divisional of U.S. application Ser. No. 13/089,296, filed Apr. 18, 2011, and claims the benefit of U.S. Prov. App. No. 61/327,335, filed Apr. 23, 2010, the entire contents of which are hereby incorporated by reference.
- This application is related to U.S. application Ser. No. 12/261,645, filed Oct. 30, 2008, now U.S. Pat. No. 7,702,203, U.S. Prov. App. 61/174,059, filed Apr. 30, 2009, and U.S. application Ser. No. 12/748,925, filed Mar. 29, 2010 and published as U.S. 2010/0260459.
- The present disclosure relates generally to optical fiber assemblies, and in particular relates to armored fiber optic assemblies having dielectric armor.
- Fiber optic cables and assemblies should preserve optical performance when deployed in the intended environment while also satisfying any other requirements for the environment. Indoor cables for riser and/or plenum spaces, for example, may require certain flame-retardant ratings as well as mechanical requirements. Mechanical characteristics such as crush performance, permissible bend radii, and temperature performance in part determine how installation and use of the cable in the installation space affect optical performance of the cable.
- According to a first embodiment, an armored fiber optic assembly comprises a fiber optic assembly having at least one optical fiber and a dielectric armor surrounding the fiber optic assembly. The dielectric armor comprises an inner dielectric layer surrounding the fiber optic assembly, and an outer dielectric layer wound around the inner layer and bonded thereto.
- According to a second embodiment, an armored fiber optic assembly comprises a fiber optic assembly having at least one optical fiber and a dielectric armor surrounding the fiber optic assembly. The dielectric armor comprises an inner dielectric layer spirally wound around the fiber optic assembly, wherein the outer layer has the shape of a strip; and an outer dielectric layer surrounding the inner layer and bonded thereto, wherein the outer layer has an armor profile.
- According to a third embodiment, a method of forming an armored fiber optic assembly comprises providing a fiber optic assembly comprising at least one optical fiber, extruding an inner layer of a dielectric armor around the fiber optic assembly, wherein extruding the inner layer comprises diverting a flow of an inner extrusion material with a first profiling feature to form a spiral strip, and extruding an outer layer of the dielectric armor around the inner layer from an outer extrusion material that is less rigid than the inner extrusion material, wherein the outer layer becomes at least partially bonded to the inner layer.
- According to a fourth embodiment, a method of forming an armored fiber optic assembly comprises providing a fiber optic assembly comprising at least one optical fiber, extruding a first layer of a dielectric armor around the fiber optic assembly, wherein extruding the first layer comprises diverting a flow of a first extrusion material with a first profiling feature rotating in a first direction, and extruding a second layer of a dielectric armor around the fiber optic assembly, wherein extruding the second layer comprises diverting a flow of an second extrusion material with a second profiling feature rotating in a second direction.
- The accompanying drawings are included to provide further understanding of the invention. The drawings illustrate the various example embodiments of the invention and, together with the description, serve to explain the principals and operations of the invention.
-
FIG. 1 is a perspective view of a first example embodiment of an armored fiber optic assembly having a dielectric armor. -
FIG. 2 is a schematic cross-sectional view of an explanatory extrusion system for making armored fiber optic assemblies. -
FIG. 3 is a perspective view of a second example embodiment of an armored fiber optic assembly. -
FIG. 4 is a schematic cross-sectional view of an explanatory extrusion system for making armored fiber optic assemblies. -
FIG. 5 is a perspective view of a third example embodiment of an armored fiber optic assembly. -
FIG. 6 is a perspective view of a portion of an extrusion die that can be used to form the fiber optic assembly ofFIG. 5 . -
FIG. 7 is a perspective view of a fourth example embodiment of an armored fiber optic assembly. - Reference is now made in detail to exemplary embodiments of the invention, examples of which are illustrated in the accompanying drawings. Whenever possible, identical or similar reference numerals are used throughout the drawings to refer to identical or similar parts.
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FIG. 1 is a perspective cut-away view of an armored fiberoptic assembly 120 including a core fiberoptic assembly 30 disposed within adielectric armor 150. Thedielectric armor 150 is non-conductive and has anouter surface 152 that includes anarmor profile 154 generally formed in a spiral along a longitudinal axis. As used herein, “armor profile” means that the outer surface has an undulating surface along its length that looks similar to conventional metal armors (i.e., a undulating shape along the length of the armor). Thedielectric armor 150 is advantageous in that it both provides crush resistance and recovers to assume its original shape when subjected to crush loads. Thedielectric armor 150 may also meet flame and/or smoke ratings, and does not require electrical grounding. - The
dielectric armor 150 includes aninner layer 162 and anouter layer 164 disposed on the outer surface of theinner layer 162. According to one aspect of the present embodiment, theinner layer 162 can have the shape of a spiral “strip” that winds around the core fiberoptic assembly 30. Theouter layer 164 can be a continuous cover or coating over the exterior of theinner layer 162. Theinner layer 162 can be more rigid than theouter layer 164. Accordingly, the Shore D hardness of theinner layer 162 can be more than the Shore D hardness of theouter jacket layer 164. An inner surface 166 of theinner layer 162 may also have an armor profile. - In the illustrated embodiment, the
outer layer 164 has a “continuous annular cross-section”. As used herein, “continuous annular cross-section” means there are no spiral grooves, openings, or slits that cut entirely through thelayer 164. The exemplaryinner layer 162 has the form of a strip wound around the core fiberoptic assembly 30. Theouter layer 164 can be extruded directly onto theinner layer 162 so that the two layers are bonded or adhered together. Theinner layer 162 may be constructed of a relatively rigid polymer, while theouter layer 164 can be relatively less rigid. The relatively rigidinner layer 162 accordingly provides tensile strength, resistance to crush, and other robust properties. However, because theinner layer 162 has the shape of a spiral strip, and because theouter layer 164 can be relatively less rigid, the armored fiberoptic assembly 120 can be relatively flexible and easy to bend. The thickness, width, and composition of the “strip” that forms theinner layer 162 can be selected to provide desirable mechanical properties. In general, theouter layer 164 completely covers theinner layer 162. The fiberoptic assembly 30 is housed within and protected by thedielectric armor 150. - In the illustrated embodiment, the fiber
optic assembly 30 is a fiber optic cable having an extrudedpolymer cable jacket 90 and a plurality of tight-bufferedoptical fibers 94 extending longitudinally through theassembly 120 within thecable jacket 90. Strength elements (not shown), such as aramid fibers, may also extend longitudinally through thecable jacket 90. In one embodiment, thecable jacket 90 can be omitted. Thearmor 150 need not be secured to thecore assembly 30 and may be separated from thecore assembly 30 by a free space or separation distance. An average or median separation ΔR can therefore be calculated as ΔR=RI−RC, where RI is the average inside radius of the armor, and RC is the average outside radius of the core assembly. - The
armor 150 can be formed by coextrusion methods. For example, the extrudate materials for the respective layers enter the extrusion tooling together, and may become strongly bonded together as the two extrudate materials solidify. Thearmor 150 can be essentially a unitary one-piece armor of two strongly bonded polymer materials, with a cross-section of the armor shown in U.S. application Ser. No. 12/748,925, filed Mar. 29, 2010 and published as U.S. 2010/0260459, and may have the same or similar values for pitch, band thickness and other dimensions.FIG. 2 is a close-up, partial cross-sectional schematic view of anexplanatory crosshead 204 used to armor fiber optic assemblies, as viewed in the Y-Z plane, that can be used to form theinner spiral layer 162 of the assembly shown inFIG. 1 . Thecrosshead 204 includes atip 248 having acentral channel 250 with anoutput end 252 and in which is arranged aprofile tube 260 having anouter surface 261, aninner surface 262 that defines atube interior 263, a proximal (output)end 264, and adistal end 265. Aprofiling feature 270 is located onouter surface 261 atoutput end 252. In an example embodiment, theprofiling feature 270 is a protrusion such as a nub or a bump. Theprofile tube interior 263 is sized to accommodate thefiber optic assembly 30 as it advances axially through theinterior 263. The profile tubedistal end 265 is centrally engaged by agear 274 that, in turn, is driven by a motor (not shown) in a manner such that theprofile tube 260 rotates withinchannel 250. - The
crosshead 204 further includes a die 278 arranged relative to thetip 248 to form a cone-like material channel 280 that generally surrounds thecentral channel 250 and that has anoutput end 282 in the same plane aschannel output end 252. Thematerial channel 280 is connected to the extruder interior 201 so as to receive extrusion material 232 therefrom and through which flows the extrusion material during the extrusion process to form theinner spiral layer 162. In the example embodiment of thecrosshead 204 ofFIG. 2 , a profiletube output end 265 extends beyond thechannel output end 252 such that theprofiling feature 270 thereon resides adjacent materialchannel output end 282. In an example embodiment, theprofile tube 260 and thetip 248 are integrated to form a unitary, one-piece tool. - In forming armored fiber optic assemblies, extrusion material (not shown) flows through the
material channel 280 and out of the materialchannel output end 282. At the same time, thefiber optic assembly 30 is fed through theprofile tube interior 263 and out of profile tube output end 864 (and thus through thetip 248 and the die 278). In the meantime, theprofile tube 260 is rotated via thegear 274 so that profilingfeature 270 redirects (i.e., shapes) the flow of the extrusion material as it flows about fiber theoptic assembly 30. As thefiber optic assembly 30 moves through the profiletube output end 264, the circular motion of theprofiling feature 270 diverts the flow of extrusion material. The combined motion of theprofiling feature 270 and the linear motion offiber optic assembly 30 forms thespiral strip 162. The speed at whichprofile tube 260 rotates relative to the motion of fiber optic assembly 30 (which may also be rotating) dictates the pitch of thespiral strip 162. The axial position of theprofiling feature 270 in relation to the materialchannel output end 282 can be varied as the feature rotates in order to, for example, form varying gaps between adjacent portions of thespiral strip 162. - To form the
outer layer 164, a second, conventional extrusion head (not shown) can be arranged downstream and adjacent to the assembly shown inFIG. 2 . The second extrusion head can apply a continuous outer jacket layer of non-conductive polymer material over the spiral stripinner layer 162. -
FIG. 3 is a perspective cut-away view of an armoredfiber optic assembly 320 including a corefiber optic assembly 30 disposed within adielectric armor 350. Thedielectric armor 350 is non-conductive and has anouter surface 352 that includes anarmor profile 354 generally formed in a spiral along a longitudinal axis. Thedielectric armor 350 is advantageous in that it both provides crush resistance and recovers to assume its original shape when subjected to crush loads. Thedielectric armor 350 may also meet flame and/or smoke ratings, and does not require electrical grounding. - The
dielectric armor 350 includes aninner layer 362 and anouter layer 364 disposed on the outer surface of theinner layer 362. According to one aspect of the present embodiment, theouter layer 364 can have the shape of a spiral “strip” that winds around the exterior of theinner layer 362. Theinner layer 362 can be less rigid than the outer,spiral layer 364. Accordingly, the Shore D hardness of theinner layer 362 can be less than the Shore D hardness of theouter jacket layer 364. Aninner surface 366 of theinner layer 362 may also have an armor profile. - In the illustrated embodiment, the
inner layer 362 has a continuous annular cross-section. The exemplaryouter layer 364 has the form of a strip wound around theinner layer 362 so that portions of theinner layer 362 are visible. Theouter layer 364 can be extruded directly onto theinner layer 362 so that the two layers are bonded or adhered together. Theouter layer 364 may be constructed of a relatively rigid polymer, while theinner layer 362 can be relatively less rigid. The relatively rigidouter layer 364 accordingly provides tensile strength, resistance to crush, and other robust properties. However, because theouter layer 364 has the shape of a spiral strip, and because theinner layer 362 can be relatively less rigid, the armoredfiber optic assembly 320 can be relatively flexible and easy to bend. The thickness, width, and composition of the “strip” that forms theouter layer 364 can be selected to provide desirable mechanical properties. In general, theouter layer 364 covers at least one quarter of the surface area of theinner layer 362. Thefiber optic assembly 330 is housed within and protected by thedielectric armor 350. - In the illustrated embodiment, the
fiber optic assembly 330 can be similar to thecore assembly 30 shown inFIG. 1 , and may be separated from thecore assembly 330 by a free space or separation distance. An average or median separation ΔR can therefore be calculated as ΔR=RI−RC, where RI is the average inside radius of the armor, and RC is the average outside radius of the core assembly. - As an alternative to the
outer layer 364 only covering certain portions of theinner layer 362, the outer layer could cover the entirety of theinner layer 362. Further, theinner layer 362 can have the form of a spiral strip wound around the fiber optic assembly, with theouter layer 364 filling in gaps in the wound strip, as well as covering the exterior of theinner layer 364. Theouter layer 364 can be less rigid than theinner layer 362 so that the resultant armored assembly has desirable bend properties. - As another alternative, to two
layers armor 350, comprised of the two interlocked spirals, would have a continuous annular cross section. The interlocked spirals can have a continuous annular cross section with an armor profile. Thearmor 350 can be formed by coextrusion methods. For example, the extrudate materials for the respective layers enter the extrusion tooling together, and may become strongly bonded together as the two extrudate materials solidify. Thearmor 350 can be essentially a unitary one-piece armor of two strongly bonded polymer materials, with a cross-section of the armor shown in U.S. application Ser. No. 12/748,925, filed Mar. 29, 2010, and may have the same or similar values for pitch, band thickness and other dimensions. -
FIG. 4 is a perspective view of an explanatory extrusion apparatus 400, that can be used to form the inner and outer armor layers. The extrusion apparatus 400 includes afirst extrusion head 404 and asecond extrusion head 406 that can be arranged end-to-end with thefirst head 404. In the exemplary embodiment, thefirst extrusion head 404 includes aprofiling feature 470 that can rotate in order to form varying gaps in a flow of extrudate to form a spiral strip. In such an application, thefirst extrusion head 404 would typically form the inner armor layer. Therefore, in the arrangement ofFIG. 4 , the fiber optic assembly shown inFIG. 1 could be produced by the apparatus 400 by extruding the inner,spiral strip layer 162 formed by theextrusion head 404, and the outercontinuous layer 164 formed over theinner layer 162 by thesecond extrusion head 406. The illustratedsecond extrusion head 406 does not include a profiling feature and can be conventional in form and operation. - The extrusion apparatus 400 can be modified to form the
fiber optic assembly 320 as shown inFIG. 3 . In this application, both thefirst extrusion head 404 and thesecond extrusion head 406 would be equipped with profiling features. Thefirst extrusion head 404 would form theinner layer 362 with a continuous armor profile. Thesecond extrusion head 406 would form the outer,spiral strip layer 364 over the continuousinner layer 362 by interrupting the flow of extrudate to form a spiral strip over the inner layer. While the extrusion apparatus 400 is shown as twoseparate heads -
FIG. 5 is a perspective cut-away view of an armoredfiber optic assembly 520 including a corefiber optic assembly 30 disposed within adielectric armor 550. The dielectric armor includes atubular portion 552 and a pair of rod-likeelongated rails 554 extending along each side of thearmor 550. Thetubular portion 552 has anouter surface 562 having anarmor profile 564 generally formed in a spiral along a longitudinal axis. Aninner surface 566 of thearmor 550 may also have an armor profile. In the illustrated embodiment, thearmor 550 has a continuous annular cross-section. - The
tubular portion 552 is illustrated as comprising a single layer of dielectric material. Thetubular portion 552 can be similar in cross-section to the armor shown in U.S. application Ser. No. 12/748,925, filed Mar. 29, 2010, and may have the same or similar values for pitch, band thickness and other dimensions. The inclusion of therails 554, however, provides increased tensile strength, allowing reduced thickness of thetubular portion 552. Therails 554 are shown as having rectangular sections on the sides of the rails distal to the armor center. Other cross-sections, however, such as curved, oval, arcuate, etc. may also be used for the elongate rails 554. Thearmor 550 need not be secured to thecore assembly 30 and may be separated from thecore assembly 30 by a free space or median separation distance. Therails 554 and thetubular portion 552 can be extruded from a common extrudate material in the same crosshead and can form a uniform, continuous piece.FIG. 6 is a close-up, partial cross-sectional schematic view of an explanatory profiling die 602. The die 602 can be used in place of the die 278 (FIG. 2 ), for example, to form theelongate rails 554 of the armoredfiber optic assembly 520. Thechannels 608 on either side of thedie 602 allow additional extrudate to flow on the sides of the armor to form the elongate rails. The rails need not be continuous, and can be interrupted so that a series of rails are attached to the tubular portion. All or some rails could alternatively be located on the inside of thetubular portion 552. -
FIG. 7 is a perspective cut-away view of an armoredfiber optic assembly 720 including a corefiber optic assembly 30 disposed within adielectric armor 750. The dielectric armor includes afirst spiral portion 752 and asecond spiral portion 754 that are wound in opposite directions and that intersect one another. Thespiral portions armor 750 provides flexibility to the armor that also prevents thespiral portions core assembly 30. Thearmor 750 need not be secured to thecore assembly 30 and may be separated from thecore assembly 30 by a free space or separation distance. Thearmor 750 includes generally diamond shaped,curved openings 760 through which the core assembly is visible. Thisarmor 750 can be formed by two counterrotating profiling projections. For example, in the configuration shown inFIG. 4 , bothextrusion crossheads openings 760 can be formed in the armor by intermittently blocking the flow of extrudate. - By way of example, the core
fiber optic assemblies fiber optic assembly 30 may have any suitable fiber count such as 6, 12 or 24-fiber MIC® cables available from Corning Cable Systems of Hickory, N.C. The core assemblies shown in the present embodiments can be separated from the interior surface of the armor by a median separation in the range of about 0.1-1.5 millimeters. Alternatively, the armor can be relatively tightly conforming to the surface of the core assembly. - The embodiments discussed above may describe specific materials for assembly components to meet desired mechanical and burn characteristics. In general, if intended for indoor use, the armored fiber optic assemblies may be flame-retardant and may have a desired flame-retardant rating depending on the intended space, such as plenum-rated, riser-rated, general-purpose, low-smoke zero-halogen (LSZH), or the like. Suitable polymer materials for the armors may be selected from one or more of the following materials to meet the desired rating: polyvinyl chloride (PVC), polyvinylidene fluoride (PVDF), flame-retardant polyethylene (FRPE), chlorinated polyvinyl chloride (CPVC), polytetraflourethylene (PTFE), polyether-ether keytone (PEEK), Fiber-Reinforced Polymer (FRP), low-smoke zero-halogen (LSZH), polybutylene terephthalate (PBT), polycarbonate (PC), polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PETE), and acrylonitrile-butadiene-styrene (ABS). PVCs available from Teknor Apex under the tradenames FG RE 8015A, 8015B and 8015D may also be used. In this specification, the terms “polymer” and “polymeric” indicate materials comprised primarily of polymers, but allow for the inclusion of non-polymer additives and other materials, such as fire-retardant compounds, etc., and the inclusion of multiple polymers in a blend. The term “polymer” is intended to encompass copolymers, for example.
- It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit and scope of the invention.
Claims (13)
1. A method of forming an armored fiber optic assembly, comprising:
providing a fiber optic assembly comprising at least one optical fiber;
extruding an inner layer of a dielectric armor around the fiber optic assembly, wherein extruding the inner layer comprises diverting a flow of an inner extrusion material with a first profiling feature to form a spiral strip; and
extruding an outer layer of the dielectric armor around the inner layer from an outer extrusion material that is less rigid than the inner extrusion material, wherein the outer layer becomes at least partially bonded to the inner layer.
2. The method of claim 1 , wherein diverting the flow of extrusion material using the first profiling feature includes relative rotational motion between the profiling feature and the fiber optic assembly and wherein diverting the flow of the inner extrusion material occurs as the fiber optic assembly passes through an extrusion crosshead.
3. The method of claim 2 , the profiling feature being a rotating element at an extrusion crosshead.
4. The method of claim 2 , the inner layer being a polyvinyl chloride (PVC) and the outer layer being a PVC.
5. The method of claim 2 , wherein the outer layer has a continuous annular cross-section.
6. The method of claim 5 , wherein the armor profile is formed to undulate along a length of the fiber optic assembly.
7. The method of claim 5 , wherein the armor profile is formed with a band thickness and a web thickness, the band thickness being between 0.5 millimeters and five millimeters.
8. The method of claim 7 , wherein the web thickness is greater than or equal to 0.1 times the band thickness, and wherein the armor profile has a pitch between 5 millimeters and 30 millimeters.
9. The method of claim 2 , wherein the profiling feature is turned by a motor.
10. The method of claim 2 , wherein the fiber optic assembly comprises a cable jacket and a plurality of optical fibers.
11. A method of forming an armored fiber optic assembly, comprising:
providing a fiber optic assembly comprising at least one optical fiber;
extruding a first layer of a dielectric armor around the fiber optic assembly, wherein extruding the first layer comprises diverting a flow of a first extrusion material with a first profiling feature rotating in a first direction; and
extruding a second layer of a dielectric armor around the fiber optic assembly, wherein extruding the second layer comprises diverting a flow of an second extrusion material with a second profiling feature rotating in a second direction, wherein
wherein the first layer becomes bonded to the second layer.
12. The method of claim 11 , wherein diverting the flow of extrusion material using the first profiling feature includes relative rotational motion between the profiling feature and the fiber optic assembly, and wherein diverting the flow of extrusion material using the second profiling feature includes relative rotational motion between the profiling feature and the fiber optic assembly.
13. The method of claim 12 , wherein the first direction is opposite to the second direction.
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US14/863,639 US20160011392A1 (en) | 2010-04-23 | 2015-09-24 | Armored fiber optic assemblies and methods of forming fiber optic assemblies |
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US32733510P | 2010-04-23 | 2010-04-23 | |
US13/089,296 US9170390B2 (en) | 2010-04-23 | 2011-04-18 | Armored fiber optic assemblies and methods of forming fiber optic assemblies |
US14/863,639 US20160011392A1 (en) | 2010-04-23 | 2015-09-24 | Armored fiber optic assemblies and methods of forming fiber optic assemblies |
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US9170390B2 (en) | 2015-10-27 |
US20110262087A1 (en) | 2011-10-27 |
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