DESC:TECHNICAL FIELD

[0001] The present disclosure relates to the field of optical fiber cable. More particularly, the present disclosure relates to an optical fiber cable assembly for direct buried application. The present application is based on and claims priority from Indian Application Number 201721000660 filed on 6th January 2017, the disclosure of which is hereby incorporated by reference herein.

BACKGROUND

[0002] Optical fiber cables have secured an important position in building network of modern communication systems across the world. One such type of optical fiber cable is micro optical fiber cable. The micro optical fiber cable is used in micro duct applications and is installed in micro ducts. Typically, the micro optical fiber cable includes sheathing layer and ripcords. Mostly, the sheathing is made of a polymeric material. Typically, the ripcords are positioned inside the sheathing for facilitating access to the core of the micro optical fiber cable. Traditionally, the micro optical fiber cable is laid inside the micro ducts by broadly performing two steps. The two steps involve burying the micro duct inside the ground followed by blowing the cable into the micro duct using a blowing machine. Typically, the micro optical fiber cables are blown into the micro duct while simultaneously pushing it into the micro duct. The micro optical fiber cables are blown into the micro duct by injecting a high volume of compressed air into the duct which flows inside the micro duct at high speed. The high pressure air propels the micro optical fiber cable further inside the micro duct.

[0003] The currently available micro optical fiber cable has certain limitations. The existing micro optical fiber cable is installed by performing two different steps. This increases the overall installation time and the cost of installation. There is a need for eliminating the blowing cable step in order to reduce cost and overall time of installation. In addition, the materials used for the sheathing do not provide sufficient mechanical strength. Also, the friction between the duct and these micro optical fiber cables inside the duct is high.

[0004] In light of the foregoing discussion, there exists a need for an optical fiber cable assembly which overcomes the above cited drawbacks of conventionally known optical fiber cables.

OBJECT OF THE DISCLOSURE

[0005] A primary object of the disclosure is to provide a cable assembly having an optical fiber cable enclosed by a duct.

[0006] Another object of the present disclosure is to reduce time of installation of the optical fiber cable.

[0007] Yet another object of the present disclosure is to enhance future capacity of optical fibers in the optical fiber cable by de-blowing the existing duct and re-blowing the optical fiber cable with a higher fiber count.

[0008] Yet another object of the present disclosure is to reduce cost of installation of the optical fiber cable.

[0009] Yet another object of the present disclosure is to reduce friction between the cable and the duct.

[0010] Yet another object of the present disclosure is to allow easy mid span of the pre-assembled duct.

SUMMARY

[0011] In an aspect, the present disclosure provides a pre-ducted optical fiber cable assembly. The pre-ducted optical fiber cable assembly includes at least one optical fiber cable. The at least one optical fiber cable is positioned substantially along a longitudinal axis of the pre-ducted optical fiber cable assembly. In addition, the at least one optical fiber cable includes at least one buffer tube. The at least one buffer tube encloses at least one optical fiber. Also, the at least one optical fiber cable includes a cable jacket. The cable jacket is a dual layer jacket. The cable jacket includes a third layer. The third layer surrounds a second layer. The third layer is made of polyethylene. In addition, the cable jacket includes a fourth layer. The fourth layer surrounds the third layer. The fourth layer is made of polyamide. The fourth layer is bonded with the third layer. The cable jacket is made of polyethylene and polyamide for termite protection and rodent protection. Further, the pre-ducted optical fiber cable assembly includes a duct. The duct encloses the at least one optical fiber cable. The duct is made of high density polyethylene. A first surface of the duct is coated with a low friction silicon coating. The low friction silicon coating is provided for reducing friction between the duct and the at least one optical fiber cable. The duct has a fill factor in a range of about 23.20% to 46.86% without the low friction silicon coating. Furthermore, the pre-ducted optical fiber cable assembly includes two ripcords positioned in a free space between the duct and the at least one optical fiber cable.

[0012] In an embodiment of the present disclosure, the pre-ducted optical fiber cable assembly further includes a central strength member. The central strength member lies substantially along a longitudinal axis of the optical fiber cable. The central strength member is made of flexible fiber reinforced plastic. The central strength member has a diameter in a range of about 1.5 millimeters – 2.0 millimeters. The central strength member is coated with a layer of polyethylene.

[0013] In an embodiment of the present disclosure, the pre-ducted optical fiber cable assembly further includes a plurality of buffer tubes stranded around a central strength member. The plurality of buffer tubes lie substantially along the longitudinal axis of the optical fiber cable. Each of the plurality of buffer tubes is made of a thermoplastic material.

[0014] In an embodiment of the present disclosure, the pre-ducted optical fiber cable assembly further includes filler. The filler lies substantially along the longitudinal axis of the at least one optical fiber cable. The filler has a diameter in a range of about 1.5 millimeters – 2.0 millimeters.

[0015] In an embodiment of the present disclosure, the pre-ducted optical fiber cable assembly further includes a first layer. The first layer surrounds the at least one buffer tube and a filler. The first layer is water blocking tape layer. The first layer has a thickness in a range of about 0.2 millimeter – 0.4 millimeter.

[0016] In an embodiment of the present disclosure, the pre-ducted optical fiber cable assembly further includes a second layer. The second layer surrounds a first layer. The second layer is an armoring layer. The armoring layer is made of electrolytic chrome-coated steel tape. The second layer has a thickness in a range of about 0.125 millimeter – 0.155 millimeter

[0017] In an embodiment of the present disclosure, the cable jacket surrounds a second layer.

[0018] In an embodiment of the present disclosure, the ripcords are positioned 180 degrees apart from each other and each of the two ripcords is made of polyester based twisted yarns.

[0019] In an embodiment of the present disclosure, the pre-ducted optical fiber cable assembly further includes a plurality of dielectric strength members embedded in the duct. The plurality of dielectric strength members extend along a length of the duct and parallel to the longitudinal axis of the optical fiber cable assembly. The plurality of dielectric strength members are positioned approximately 180 degrees apart and diagonally opposite from each other. The plurality of dielectric strength members is made of a material selected from a group. The group consists of steel and fiber reinforced plastic. The plurality of dielectric strength members has a diameter in a range of about 1 millimeter - 2 millimeters.

[0020] In an embodiment of the present disclosure, the at least one buffer tube has a thickness in a range of about 0.15 millimeter – 0.4 millimeters.

[0021] In an embodiment of the present disclosure, the at least one buffer tube has a first diameter in a range of about 1.3 millimeters – 1.6 millimeters.

[0022] In an embodiment of the present disclosure, the at least one buffer tube has a second diameter in a range of about 1.5 millimeters – 2.0 millimeters.

[0023] In an embodiment of the present disclosure, the pre-ducted optical fiber cable assembly further includes a gel filled inside the at least one buffer tube. The gel is a thixotropic gel and prevents ingression of water inside the at least one buffer tube.

[0024] In an embodiment of the present disclosure, each of the at least one optical fiber has a diameter in a range of about 200±10 microns.

[0025] In an embodiment of the present disclosure, each of the at least one optical fiber has a diameter in a range of about 250±10 microns.

[0026] In an embodiment of the present disclosure, the third layer has a thickness in a range of about 1.0 millimeter - 1.6 millimeters.

[0027] In an embodiment of the present disclosure, the fourth layer has a thickness in a range of about 0.3 millimeter - 0.5 millimeter.

[0028] In an embodiment of the present disclosure, the low friction silicon coating has a thickness in a range of about 0.2 millimeter - 0.4 millimeter.

[0029] In an embodiment of the present disclosure, the duct has a diameter in a range of about 20 millimeters - 40 millimeters.

[0030] In an embodiment of the present disclosure, the duct has a thickness in a range of about 2 millimeters - 4 millimeters.

[0031] In an embodiment of the present disclosure, the at least one optical fiber cable has a diameter in a range of about 11.5 millimeters ± 0.5 millimeter.

[0032] In an embodiment of the present disclosure, the at least one optical fiber cable has weight in a range of about 100 Kg/Km ± 5 percent.

[0033] In an embodiment of the present disclosure, the at least one optical fiber cable has a maximum tensile strength of 2670 Newton.

[0034] In an embodiment of the present disclosure, the at least one optical fiber cable has a minimum bend radius of 20D.

[0035] In an embodiment of the present disclosure, the at least one optical fiber cable has a crush resistance of 2000N/100*100 mm.

[0036] In an embodiment of the present disclosure, the at least one optical fiber cable has a cable length in a range of about 2 Km ± 5 percent.

[0037] In an embodiment of the present disclosure, the at least one optical fiber cable has torsion of ± 180 degrees.

[0038] In an embodiment of the present disclosure, the pre-ducted optical fiber cable assembly has a diameter in a range of about 25.3 millimeters ± 0.5 millimeter.

[0039] In an embodiment of the present disclosure, the pre-ducted optical fiber cable assembly has weight in a range of about 310 Kg/Km ± 5 percent.

[0040] In an embodiment of the present disclosure, the pre-ducted optical fiber cable assembly has a maximum tensile strength of 4000 Newton.

[0041] In an embodiment of the present disclosure, the pre-ducted optical fiber cable assembly has a minimum bend radius of 20D.

[0042] In an embodiment of the present disclosure, the pre-ducted optical fiber cable assembly has a crush resistance of 5000N/100*100 mm.

[0043] In an embodiment of the present disclosure, the pre-ducted optical fiber cable assembly has torsion of ± 180 degrees.

[0044] In an embodiment of the present disclosure, each pre-ducted optical fiber cable assembly of a plurality of pre-ducted optical fiber cable assemblies defined along a longitudinal axis is grouped with a planar cross section. The grouped optical fiber cable assemblies are enclosed longitudinally by a fifth layer along a length of the grouped optical fiber cable assemblies.

STATEMENT OF THE DISCLOSURE

[0045] The present disclosure relates to a pre-ducted optical fiber cable assembly. The pre-ducted optical fiber cable assembly includes at least one optical fiber cable. The at least one optical fiber cable is positioned substantially along a longitudinal axis of the pre-ducted optical fiber cable assembly. In addition, the at least one optical fiber cable includes at least one buffer tube. The at least one buffer tube encloses at least one optical fiber. Also, the at least one optical fiber cable includes a cable jacket. The cable jacket is a dual layer jacket. The cable jacket includes a third layer. The third layer surrounds a second layer. The third layer is made of polyethylene. In addition, the cable jacket includes a fourth layer. The fourth layer surrounds the third layer. The fourth layer is made of polyamide. The fourth layer is bonded with the third layer. The cable jacket is made of polyethylene and polyamide for termite protection and rodent protection. Further, the pre-ducted optical fiber cable assembly includes a duct. The duct encloses the at least one optical fiber cable. The duct is made of high density polyethylene. A first surface of the duct is coated with a low friction silicon coating. The low friction silicon coating is provided for reducing friction between the duct and the at least one optical fiber cable. The duct has a fill factor in a range of about 23.20% to 46.86% without the low friction silicon coating. Furthermore, the pre-ducted optical fiber cable assembly includes two ripcords positioned in a free space between the duct and the at least one optical fiber cable.

BRIEF DESCRIPTION OF FIGURES

[0046] Having thus described the disclosure in general terms, reference will now be made to the accompanying figures, wherein:

[0047] FIG. 1A illustrates a cross sectional view of an optical fiber cable assembly, in accordance with an embodiment of the present disclosure;

[0048] FIG. 1B illustrates a cross sectional view of another optical fiber cable assembly, in accordance with another embodiment of the present disclosure;

[0049] FIG. 1C illustrates a cross-sectional view of yet another optical fiber cable assembly, in accordance with yet another embodiment of the present disclosure; and

[0050] FIG. 2 illustrates a cross-sectional view of an arrangement of grouped optical fiber cable assemblies, in accordance with yet another embodiment of the present disclosure.

[0051] It should be noted that the accompanying figures are intended to present illustrations of exemplary embodiments of the present disclosure. These figures are not intended to limit the scope of the present disclosure. It should also be noted that accompanying figures are not necessarily drawn to scale.

DETAILED DESCRIPTION

[0052] Reference will now be made in detail to selected embodiments of the present disclosure in conjunction with accompanying figures. The embodiments described herein are not intended to limit the scope of the disclosure, and the present disclosure should not be construed as limited to the embodiments described. This disclosure may be embodied in different forms without departing from the scope and spirit of the disclosure. It should be understood that the accompanying figures are intended and provided to illustrate embodiments of the disclosure described below and are not necessarily drawn to scale. In the drawings, like numbers refer to like elements throughout, and thicknesses and dimensions of some components may be exaggerated for providing better clarity and ease of understanding.

[0053] It should be noted that the terms "first", "second", and the like, herein do not denote any order, ranking, quantity, or importance, but rather are used to distinguish one element from another. Further, the terms "a" and "an" herein do not denote a limitation of quantity, but rather denote the presence of at least one of the referenced item.

[0054] FIG. 1A illustrates a cross sectional view of a pre-ducted optical fiber cable assembly 100, in accordance with an embodiment of the present disclosure. The pre-ducted optical fiber cable assembly 100 is used for underground application. The pre-ducted optical fiber cable assembly 100 can be installed directly underground. Moreover, the pre-ducted optical fiber cable assembly 100 is used for direct buried applications. The pre-ducted optical fiber cable assembly 100 can be directly buried inside the ground. The pre-ducted optical fiber cable assembly 100 includes at least one optical fiber cable and a duct 104. The at least one optical fiber cable includes an optical fiber cable 102. The duct 104 encloses the optical fiber cable 102. The duct 104 is a pre-installed duct. The duct 104 allows direct installation of the optical fiber cable 102 without the need of blowing the optical fiber cable 102. In an embodiment of the present disclosure, pre-ducted optical fiber cable assembly 100 has a packing factor in a range of about 0.006 – 0.011. The packing factor of the pre-ducted optical fiber cable assembly 100 corresponds to ratio of sum of areas of optical fibers inside the optical fiber cable 102 to inner cross sectional area of the duct 104.

[0055] The optical fiber cable 102 and the duct 104 are substantially positioned along a longitudinal axis 146 of the pre-ducted optical fiber cable assembly 100. Also, the optical fiber cable 102 and the duct 104 are separated by free space 150. The optical fiber cable 102 is loosely placed inside the duct 104. The duct 104 does not stick with the optical fiber cable 102. In addition, the non-sticking of the duct 104 is due to the material from which outer jacket of the optical fiber cable 102 is made. The duct 104 is characterized by a thickness. In an embodiment of the present disclosure, the thickness of the duct 104 is in a range of 2-4 millimeters. In another embodiment of the present disclosure, the thickness of the duct 104 may vary.

[0056] Furthermore, the duct 104 is characterized by a diameter. In an embodiment of the present disclosure, the diameter of the duct 104 is in a range of 20-40 millimeters. In another embodiment of the present disclosure, the diameter of the duct 104 may vary. In an embodiment of the present disclosure, the diameter of the duct 104 may increase based on a number of optical fiber cables inside the duct 104 (as shown in FIG. 1B and FIG. 1C). The duct 104 is made of high density polyethylene. In addition, the duct 104 is black in color and ultraviolet proof. The duct 104 has a fill factor in a range of about 23.20% to 46.86% without the low friction silicon coating 124. The fill factor of the duct 104 without the low friction silicon coating 124 corresponds to a ratio of a cross section area of the optical fiber cable 102 and an inner cross-sectional area of the duct 104 excluding the low friction silicon coating 124. In an embodiment of the present disclosure, the duct 104 has a fill factor in a range of about 23.63% to 47.99% with the low friction silicon coating 124. The fill factor of the duct 104 with the low friction silicon coating 124 corresponds to a ratio of a cross section area of the optical fiber cable 102 and an inner cross-sectional area of the duct 104 considering the low friction silicon coating 124.

[0057] The optical fiber cable 102 is used for installation in the duct 104. In addition, the optical fiber cable 102 is used for underground installations. In an embodiment of the present disclosure, the optical fiber cable 102 is an armored cable. In an embodiment of the present disclosure, the optical fiber cable 102 is a 48F optical fiber cable. In addition, 48F corresponds to 48 optical fibers. However, the optical fiber cable 102 may contain any number of optical fibers depending upon the application.

[0058] The optical fiber cable 102 is made of a plurality of layers (mentioned below in the provisional patent application). The plurality of layers encloses a combination of one or more buffer tubes and filler. Each of the one or more buffer tubes is a loose buffer tube. Each buffer tube of the one or more buffer tubes encloses a plurality of optical fibers. In an embodiment of the present disclosure, the plurality of optical fibers is loosely held inside the one or more buffer tubes. In an embodiment of the present disclosure, each of the one or more buffer tubes has a small diameter (mentioned below in the provisional patent application). In an embodiment of the present disclosure, the optical fiber cable 102 has a packing factor in a range of about 0.029 – 0.043. The packing factor of the optical fiber cable 102 corresponds to a ratio of sum of areas of optical fibers inside the optical fiber cable 102 to inner cross sectional area of the optical fiber cable 102.

[0059] Going further, the optical fiber cable 102 includes a central strength member 106, plurality of buffer tubes 108a-108d, plurality of optical fibers 110a-110d, a filler 112, a first layer 114 and a second layer 116. In addition, the optical fiber cable 102 includes a third layer 118, a fourth layer 120 and a plurality of ripcords. The optical fiber cable 102 is used to transmit optical signals (which may carry sensor data or communication data).

[0060] Further, the central strength member 106 lies substantially along a longitudinal axis 148 of the optical fiber cable 102. In an embodiment of the present disclosure, the central strength member 106 is coated with a layer of polyethylene. In another embodiment of the present disclosure, the central strength member 102 may be coated with any suitable material. In yet another embodiment of the present disclosure, the central strength member 106 may not be coated. In an embodiment of the present disclosure, the central strength member 106 has a circular cross-section. The central strength member 106 is made of a composite material having a polymer matrix. The composite material is made of flexible fiber reinforced plastic.

[0061] The fiber reinforced plastic is a composite material having a polymer matrix reinforced with glass fibers. Examples of the fiber reinforced plastics include glass fibers, carbon fibers, aramid fibers, basalt fibers and the like. In an embodiment of the present disclosure, the central strength member 106 is made of any suitable material. Moreover, the central strength member 106 provides physical strength to the optical fiber cable 102 and resists over bending of the optical fiber cable 102. The central strength member 106 provides tensile strength to the optical fiber cable 102. The tensile strength corresponds to a resistance shown by the optical fiber cable 102 against buckling.

[0062] The central strength member 106 is characterized by a diameter measured substantially across the cross section and from the longitudinal axis 148 of the optical fiber cable 102. In an embodiment of the present disclosure, the central strength member 106 has a diameter in a range of 1.5-2.0 millimeters. In another embodiment of the present disclosure, the diameter of the central strength member 106 may vary. Also, the central strength member 106 prevents buckling of the optical fiber cable 102. In another embodiment of the present disclosure, the diameter of the central strength member 106 with the polyethylene coating may have any suitable value.

[0063] Further, the optical fiber cable 102 includes at least one buffer tube. In an embodiment of the present disclosure, the optical fiber cable 102 includes the plurality of buffer tubes 108a-108d and the filler 112. The plurality of buffer tubes 108a-108d and the filler 112 is stranded around the central strength member 106 to form a stranded core. In an embodiment of the present disclosure, the central strength member 106 is surrounded by the plurality of buffer tubes 108a-108d and the filler 112. In an embodiment of the present disclosure, the plurality of buffer tubes 108a-108d and the filler 112 is S-Z stranded around the central strength member 106. Each of the plurality of buffer tubes 108a-108d and the filler 112 is wound around the central strength member 106 in sections with a first direction of winding in an S-shape alternating with the sections with a second direction of winding in a Z-shape. In an embodiment of the present disclosure, the first direction is a clockwise direction and the second direction is an anticlockwise direction. The binding is performed to retain lay length of the stranded buffer tubes and filler and uniform stress distribution along length of the optical fiber cable 102. The S-Z fashion of stranding is a form of stranding of the plurality of buffer tubes 108a-108d and the filler 112. In addition, the S-Z stranding allows uniform distribution of the stress across all the plurality of buffer tubes 108a-108d and the filler 112. The S-Z stranding may have any number of turns between the S-shape and the Z-shape. In an embodiment of the present disclosure, the S-Z stranding may have 4-7 turns between the S-shape and the Z –shape.

[0064] The SZ stranding is performed in order to maintain a uniform lay length, mid-spanning and achieve higher production speeds and longer lengths of cable as compared to helical stranding. In general, the lay length is a longitudinal distance along length of the central strength member 106 required for one buffer tube to go all the way around the central strength member 106 to complete one rotation. In another embodiment of the present disclosure, the plurality of buffer tubes 108a-108d and the filler 112 is helically stranded around the central strength member 106.

[0065] The cross section of each of the plurality of buffer tubes 108a-108d and the filler 112 is circular in shape. In an embodiment of the present disclosure, the cross section of each of the plurality of buffer tubes 108a-108d and the filler 112 may be of any suitable shape. In an embodiment of the present disclosure, each of the plurality of buffer tubes 108a-108d and the filler 112 have a uniform structure and dimensions. In an embodiment of the present disclosure, number of the plurality of buffer tubes 108a-108d is 4. In another embodiment of the present disclosure, the number of the plurality of buffer tubes 108a-108d may vary.

[0066] The filler 112 is used for maintenance of circular shape or geometry of the optical fiber cable 102. In an embodiment of the present disclosure, the filler 112 may replace any buffer tube based on the application. In an embodiment of the present disclosure, the filler 112 is made of a thermoplastic material. In an embodiment of the present disclosure, the filler 112 may have a diameter in a range of 1.5 – 2.0 millimeters. In an embodiment of the present disclosure, more number of fillers may be placed inside the core of the optical fiber cable 102.

[0067] Each of the plurality of buffer tubes 108a-108d has a thickness. In an embodiment of the present disclosure, the thickness of each of the plurality of buffer tubes 108a-108d is equal. In an embodiment of the present disclosure, the thickness of each of the plurality of buffer tubes 108a-108d is in a range of about 0.15 – 0.4 millimeter. In another embodiment of the present disclosure, the thickness of each of the plurality of buffer tubes 108a-108d may vary. Each of the plurality of buffer tubes 108a-108d is characterized by a first diameter and a second diameter. The first diameter is an inner diameter of the plurality of buffer tubes 108a-108d and the second diameter is an outer diameter of the plurality of buffer tubes 108a-108d. In an embodiment of the present disclosure, the first diameter of each of the plurality of buffer tubes 108a-108d is in a range of about 1.3 – 1.6 millimeters. In yet another embodiment of the present disclosure, the first diameter of each of the plurality of buffer tubes 108a-108d may vary. In an embodiment of the present disclosure, the second diameter of each of the plurality of buffer tubes 108a-108d is in a range of about 1.5 – 2.0 millimeters. In yet another embodiment of the present disclosure, the second diameter of each of the plurality of buffer tubes 108a-108d may vary. Further, each of the plurality of buffer tubes 108a-108d is a micro loose tube.

[0068] Going further, the at least one buffer tube encloses at least one optical fiber. In an embodiment of the present disclosure, each of the plurality of buffer tubes 108a-108d encloses a corresponding plurality of optical fibers 110a-110d. In addition, each of the plurality of buffer tubes 108a-108d encloses 12 optical fibers. In an embodiment of the present disclosure, each of the plurality of buffer tubes 108a-108d may enclose more or less number of optical fibers. In an example, the total number of optical fibers 110a-110d in the optical fiber cable 102 is 48. Each of the plurality of buffer tubes 108a-108d is a tube for encapsulating the corresponding plurality of optical fibers 110a-110d. The plurality of buffer tubes 108a-108d provides support and protection to each of the corresponding plurality of optical fibers 110a-110d against crush, bend and stretch. In addition, the plurality of buffer tubes 108a-108d protects the corresponding plurality of optical fibers 110a-110d and prevents ingression of water inside the stranded core of the optical fiber cable 102.

[0069] Further, the plurality of buffer tubes 108a-108d provides mechanical isolation, physical damage protection and identification of each of the corresponding plurality of optical fibers 110a-110d. In an embodiment of the present disclosure, each of the plurality of buffer tubes 108a-108d is colored. In an embodiment of the present disclosure, each of the plurality of buffer tubes 108a-108d has a different color. In addition, total number of colors available for coloring the buffer tubes is 12. The coloring is done for identification of each of the plurality of buffer tubes 108a-108d. The colors include blue, orange, green, brown, gray, white, red, black, yellow, violet, pink and aqua. In an embodiment of the present disclosure, each of the plurality of buffer tubes 108a-108d is made from a thermoplastic material. In an embodiment of the present disclosure, the thermoplastic material used for the plurality of buffer tubes 108a-108d is polybutylene terephthalate. In another embodiment of the present disclosure, the plurality of buffer tubes 108a-108d may be made of any other suitable material.

[0070] In an embodiment of the present disclosure, each of the plurality of buffer tubes 108a-108d is filled with a gel. In an embodiment of the present disclosure, the gel is a thixotropic gel. In an embodiment of the present disclosure, the thixotropic gel prevents ingression of water inside each of the plurality of buffer tubes 108a-108d. In another embodiment of the present disclosure, the plurality of buffer tubes 108a-108d may not be filled with the gel.

[0071] Further, each of the plurality of optical fibers 110a-110d is a fiber used for transmitting information as light pulses from one end to another. In addition, each of the plurality of optical fibers 110a-110d is a thin strand of glass capable of transmitting optical signals. Also, each of the plurality of optical fibers 110a-110d is configured to transmit large amounts of information over long distances with relatively low attenuation. Further, each of the plurality of optical fibers 110a-110d includes a core region and a cladding region. The core region is an inner part of an optical fiber and the cladding section is an outer part of the optical fiber. Moreover, the core region is defined by a central longitudinal axis of each of the plurality of optical fibers 110a-110d. In addition, the cladding region surrounds the core region.

[0072] In an embodiment of the present disclosure, each of the plurality of optical fibers 110a-110d has a diameter in a range of 200±10 microns. In another embodiment of the present disclosure, each of the plurality of optical fibers 110a-110d has a diameter in a range of 250±10 microns. In yet another embodiment of the present disclosure, the diameter of each of the plurality of optical fibers 110a-110d may vary. In an embodiment of the present disclosure, each of the plurality of optical fibers 110a-110d is a single mode fiber. In another embodiment of the present disclosure, each of the plurality of optical fibers 110a-110d is a multimode fiber.

[0073] In an embodiment of the present disclosure, number of the plurality of optical fibers 110a-110d in each of the plurality of buffer tubes 108a-108d is 12. In another embodiment of the present disclosure, the number of the plurality of optical fibers 110a-110d in each of the plurality of buffer tubes 108a-108d is more or less than 12. In an embodiment of the present disclosure, the number of the plurality of optical fibers 110a-110d in each buffer tube may vary depending upon the cable requirements. Accordingly, a total number of the plurality of optical fibers 110a-110d in the optical fiber cable 102 is 48 (12*4). In an embodiment of the present disclosure, the total number of the plurality of optical fibers 110a-110d may be more or less than 48 depending upon the number of buffer tubes and the optical fibers in each buffer tube.

[0074] In an embodiment of the present disclosure, each of the plurality of optical fibers 110a-110d is a colored optical fiber. In an embodiment of the present disclosure, each of the plurality of optical fibers 110a-110d has a different color. In another embodiment of the present disclosure, the total number of colors available for coloring the optical fibers is 12. The coloring is done for identification of each of the plurality of optical fibers 110a-110d. The colors include blue, orange, green, brown, slate, white, red, black, yellow, violet, pink and aqua. In an embodiment of the present disclosure, each of the plurality of optical fibers 110a-110d has a maximum fiber attenuation of 0.35 dB/km at a wavelength of 1310 nanometers. In an embodiment of the present disclosure, each of the plurality of optical fibers 110a-110d has a maximum fiber attenuation of 0.23 dB/km at a wavelength of 1550 nanometers. The fiber attenuation corresponds to loss of optical power as light travels along the optical fiber. In an embodiment of the present disclosure, each of the plurality of optical fibers 110a-110d has a polarization mode dispersion of less than 0.2 ps/vkm at a wavelength of 1310 nanometers.

[0075] In an embodiment of the present disclosure, the optical fiber cable 102 includes the first layer 114. In an embodiment of the present disclosure, the first layer 114 surrounds the plurality of buffer tubes 108a-108d and the filler 112. In an embodiment of the present disclosure, the first layer 114 is water blocking tape layer. The water blocking tape acts as a binding element for the plurality of buffer tubes 108a-108d and the filler 112. The water blocking tape prevents ingression of water inside the core of the optical fiber cable 102. The first layer 114 is characterized by thickness. In an embodiment of the present disclosure, the first layer 114 has a thickness in a range of about 0.2 – 0.4 millimeter. In another embodiment of the present disclosure, the thickness of the first layer 114 may vary. In another embodiment of the present disclosure, the optical fiber cable 102 may not include the first layer 114.

[0076] In an embodiment of the present disclosure, the optical fiber cable 102 includes the second layer 116. In an embodiment of the present disclosure, the second layer 116 surrounds the first layer 114. In an embodiment of the present disclosure, the second layer 116 is an armoring layer. The armoring layer provides mechanical strength and protection to the optical fiber cable 102. In an embodiment of the present disclosure, the second layer 116 is made of electrolytic chrome-coated steel tape. The second layer 116 is characterized by a thickness. In an embodiment of the present disclosure, the second layer 116 has a thickness in a range of about 0.125 millimeter – 0.155 millimeter. In another embodiment of the present disclosure, the thickness of the second layer 116 may vary. In another embodiment of the present disclosure, the optical fiber cable 102 may not include the second layer 116.

[0077] Going further, the optical fiber cable 102 includes a cable jacket 118-120. The cable jacket 118-120 is a dual layer jacket. The cable jacket 118-120 of the optical fiber cable 102 includes the third layer 118 and the fourth layer 120. The third layer 118 surrounds the second layer 116. The fourth layer 120 surrounds the third layer 118. The third layer 118 and the fourth layer 120 together constitute an outer sheathing of the optical fiber cable 102. In an embodiment of the present disclosure, the optical fiber cable 102 has dual layer sheathing. In an embodiment of the present disclosure, the third layer 118 is black in color. In another embodiment of the present disclosure, the third layer 118 may be of any color. In an embodiment of the present disclosure, the fourth layer 120 is yellow in color. In another embodiment of the present disclosure, the fourth layer 120 may be of any color. The third layer 118 and the fourth layer 120 protect the optical fiber cable 102 against the crush, the bend and tensile stress along the length of the optical fiber cable 102.

[0078] The third layer 118 is made of polyethylene. The fourth layer 120 is made of polyamide. The cable jacket 118-120 is made of polyethylene and polyamide for termite protection and rodent protection. The third layer 118 and the fourth layer 120 are bonded together. The bonding is done with a material. The material used for bonding the third layer 118 with the fourth layer 120 is FUSABOND®. The material FUSABOND® is mixed with the material of the third layer 118 which allows the bonding between the third layer 118 and the fourth layer 120. In general, FUSABOND® is a family of functional polymers modified for bonding dissimilar polymers used in toughened, filled and blended compounds.

[0079] The third layer 118 is characterized by a thickness. In an embodiment of the present disclosure, the thickness of the third layer 118 is in a range of about 1.0 millimeter – 1.6 millimeter. In another embodiment of the present disclosure, the thickness of the third layer 118 may vary. The fourth layer 120 is characterized by a thickness. In an embodiment of the present disclosure, the thickness of the fourth layer 120 is in a range of 0.3 millimeter – 0.5 millimeter. In another embodiment of the present disclosure, the thickness of the fourth layer 120 may vary. Further, the combination of the third layer 118 and the fourth layer 120 provide termite protection and rodent resistance. In an embodiment of the present disclosure, the combination of the third layer 118 and the fourth layer 120 allows at least 20 percent increase in strength of the optical fiber cable 102.

[0080] Further, the optical fiber cable 102 includes two ripcords. In another embodiment of the present disclosure, a number of the plurality of ripcords is 2. In yet another embodiment of the present disclosure, the number of the ripcords may vary. In an embodiment of the present disclosure, the two ripcords include a first ripcord 122a and a second ripcord 122b. In an embodiment of the present disclosure, the first ripcord 122a and the second ripcord 122b are positioned 180 degrees apart from each other. The first ripcord 122a and the second ripcord 122b are positioned in the free space 150 between the optical fiber cable 102 and the duct 104. The first ripcord 122a and the second ripcord 122b lie substantially along the longitudinal axis 148 of the optical fiber cable 102. The positioning of the first ripcord 122a and the second ripcord 122b allows the duct 104 to be ripped during mid-span preparation. The positioning of the first ripcord 122a and the second ripcord 122b allows easy access to the optical fiber cable 102.

[0081] In an embodiment of the present disclosure, the two ripcords are made of polyester based twisted yarns. In another embodiment of the present disclosure, the two ripcords may be made of any suitable material. In an embodiment of the present disclosure, each of the two ripcords has a circular cross-section. Furthermore, the cable assembly 100 includes the low friction silicon coating 124. The low friction silicon coating 124 is provided on a first surface of the duct 104. The first surface is an inner wall or inner surface of the duct 104. The low friction silicon coating 124 allows reduction in friction between the optical fiber cable 102 and the duct 104. The optical fiber cable 102 and the duct 104 experience friction between each other due to continuous contact. In an embodiment of the present disclosure, the low friction silicon coating 124 has a thickness in a range of about 0.2-0.4 millimeter. In another embodiment of the present disclosure, the thickness of the low friction silicon coating 124 may vary. In an embodiment of the present disclosure, the free space 150 with the low friction silicon coating 124 is in a range of about 4.9 millimeters – 11.1 millimeters. In an embodiment of the present disclosure, the free space 150 without the low friction silicon coating 124 is in a range of about 5.3 millimeters – 11.3 millimeters. The free space 150 is equal to inner diameter of the duct 104 minus the outer diameter of the optical fiber cable 102.

[0082] In an embodiment of the present disclosure, the optical fiber cable 102 has a diameter in a range of about 11.5 millimeters ± 0.5 millimeter. In another embodiment of the present disclosure, the diameter of the optical fiber cable 102 may vary. In an embodiment of the present disclosure, the optical fiber cable 102 has weight in a range of about 100 Kg/Km ± 5 percent. In another embodiment of the present disclosure, the weight of the optical fiber cable 102 may vary. In an embodiment of the present disclosure, the optical fiber cable 102 has a maximum tensile strength of 2670 Newton. In an embodiment of the present disclosure, the optical fiber cable 102 has a minimum bend radius of 20D. In an embodiment of the present disclosure, the optical fiber cable 102 has a crush resistance of 2000N/100*100 mm. In an embodiment of the present disclosure, the optical fiber cable 102 has a cable length of about 2 Km ± 5 percent. In an embodiment of the present disclosure, the optical fiber cable 102 has torsion of ± 180 degrees. The torsion corresponds to ability of the optical fiber cable 102 to withstand mechanical twisting.

[0083] In an embodiment of the present disclosure, the pre-ducted optical fiber cable assembly 100 has a diameter in a range of about 25.3 millimeters ± 0.5 millimeter. In another embodiment of the present disclosure, the diameter of the pre-ducted optical fiber cable assembly 100 may vary. In an embodiment of the present disclosure, the pre-ducted optical fiber cable assembly 100 has weight in a range of about 310 Kg/Km ± 5 percent. In another embodiment of the present disclosure, the weight of the pre-ducted optical fiber cable assembly 100 may vary. In an embodiment of the present disclosure, the pre-ducted optical fiber cable assembly 100 has a maximum tensile strength of 4000 Newton. In an embodiment of the present disclosure, the pre-ducted optical fiber cable assembly 100 has a minimum bend radius of 20D. In an embodiment of the present disclosure, the pre-ducted optical fiber cable assembly 100 has a crush resistance of 5000N/100*100 mm. In an embodiment of the present disclosure, the pre-ducted optical fiber cable assembly 100 has torsion of ± 180 degrees. The torsion corresponds to ability of the pre-ducted optical fiber cable assembly 100 to withstand mechanical twisting.

[0084] FIG. 1B illustrates a cross sectional view of another pre-ducted optical fiber cable assembly 100, in accordance with another embodiment of the present disclosure. The pre-ducted optical fiber cable assembly 100 includes the optical fiber cable 102 and an optical fiber cable 126. The optical fiber cable 102 and the optical fiber cable 126 are similar in structure, material and dimensions. In an embodiment of the present disclosure, the pre-ducted optical fiber cable assembly 100 includes two optical fiber cables enclosed by the duct 104. In another embodiment of the present disclosure, the pre-ducted optical fiber cable assembly 100 may include more than two optical fiber cables enclosed by the duct 104.

[0085] The optical fiber cable 126 includes a central strength member 128, one or more buffer tubes 130a-130d, plurality of optical fibers 132a-132d, a filler 134, a first layer 136 and a second layer 138. In addition, the optical fiber cable 126 includes a third layer 140 and a fourth layer 142. The elements of the optical fiber cable 126 are the same as the elements of the optical fiber cable 102. In an embodiment of the present disclosure, the duct 104 is circular in shape. In another embodiment of the present disclosure, the duct 104 is elliptical in shape (as shown in FIG. 1C). In yet another embodiment of the present disclosure, the duct 104 may have any other shape depending on the number of optical fiber cables inside the duct 104.

[0086] In an embodiment of the present disclosure, the optical fiber cable 102 and the optical fiber cable 126 are loosely positioned inside the duct 104. In another embodiment of the present disclosure, the optical fiber cable 102 and the optical fiber cable 126 are tightly packed inside the duct 104 (as shown in FIG. 1C). Further, the number of the plurality of ripcords may or may not remain same based on the application. In an embodiment of the present disclosure, the plurality of ripcords may be positioned at any place in the pre-ducted optical fiber cable assembly 100. In an embodiment of the present disclosure, the first ripcord 122a and the second ripcord 122b are always positioned 180 degrees apart from each other.

[0087] In an embodiment of the present disclosure, the pre-ducted optical fiber cable assembly 100 includes a plurality of dielectric strength members 144a-144b. In another embodiment of the present disclosure, the pre-ducted optical fiber cable assembly 100 may include a single dielectric strength member. The plurality of dielectric strength members are embedded in the duct 104. The plurality of dielectric strength member 144a-144b extends along a length of the duct 104 and parallel to the longitudinal axis 146 of the pre-ducted optical fiber cable assembly 100. In an embodiment of the present disclosure, the plurality of dielectric strength members 144a-144b are positioned approximately 180 degrees apart. In an embodiment of the present disclosure, the plurality of dielectric strength members 144a-144b are placed diagonally apart from each other. In an embodiment of the present disclosure, the plurality of dielectric strength members 144a-144b is made of a material selected from a group. The group consists of steel and fiber reinforced plastic. In an embodiment of the present disclosure, the plurality of dielectric strength members 144a-144b has a diameter in a range of 1-2 millimeters. In another embodiment of the present disclosure, the diameter of the plurality of dielectric strength members 144a-144b may vary. The plurality of dielectric strength members 144a-144b improve the tensile / pulling force of the duct 104.

[0088] FIG. 2 illustrates a cross-sectional view of an arrangement 200 of grouped optical fiber cable assemblies, in accordance with yet another embodiment of the present disclosure. The arrangement 200 an optical fiber cable assembly 202 and an optical fiber cable assembly 204. The optical fiber cable assembly 202 and the optical fiber cable assembly 204 is similar to the pre-ducted optical fiber cable assembly 100 of FIG. 1A. The pre-ducted optical fiber cable assembly 202 and the pre-ducted optical fiber cable assembly 204 of a plurality of pre-ducted optical fiber cable assemblies defined along a longitudinal axis 208 is grouped with a planar cross section.

[0089] Further, the combination of the optical fiber cable assembly 202 and the optical fiber cable assembly 204 is enclosed by a fifth layer 206. In an embodiment of the present disclosure, the fifth layer 206 is an additional duct layer. In an embodiment of the present disclosure, the fifth layer 206 is made of a material selected from a group. The group consists of high density polyethylene, polypropylene, polyamide and polyvinyl chloride. In another embodiment of the present disclosure, the fifth layer 206 may be made of any other suitable material. The fifth layer 206 holds the grouped optical fiber cable assemblies together. In an embodiment of the present disclosure, the optical fiber cable assembly 202 and the optical fiber cable assembly 204 is jacketed together by the fifth layer 206. In an embodiment of the present disclosure, the fifth layer 206 has a thickness in a range of 1-2 millimeters. In another embodiment of the present disclosure, the thickness of the fifth layer 206 may vary.

[0090] In an embodiment of the present disclosure, the fifth layer 206 may be used for jacketing multiple combinations of optical fiber cable assemblies together. In an example, the fifth layer 206 may jacket 3 combinations of the optical fiber cable assemblies together. In another example, the fifth layer 206 may jacket 4 combinations of the optical fiber cable assemblies together. In yet another example, the fifth layer 206 may jacket 5 combinations of the optical fiber cable assemblies together. In an embodiment of the present disclosure, the fifth layer 206 is flat shaped. In another embodiment of the present disclosure, the fifth layer 206 is triangle shaped. In yet another embodiment of the present disclosure, the fifth layer 206 is square shaped. In yet another embodiment of the present disclosure, the fifth layer 206 is hexagonal shaped. In an embodiment of the present disclosure, the shape of the fifth layer 206 is based on a number of the grouped optical fiber cable assemblies.

[0091] The present disclosure provides numerous advantages over the prior art. The optical fiber cable is enclosed by the duct. This eliminates the need for blowing the optical fiber cable with the cable blowing machine. Accordingly, the elimination of the blowing process reduces the time of installation of the optical fiber cable and the cost of installation of the optical fiber cable. In addition, the arrangement of the optical fiber cables with corresponding ducts allows future fiber capacity enhancements. This is achieved by occupying one duct with an optical fiber cable and keeping the other duct empty to facilitate blowing of a new cable in the empty duct. Also, each of the ducts may enclose pre-installed optical fiber cables. Further, the present design allows a new cable with same fiber capacity or higher fiber capacity to be blown into the duct by de-blowing the existing cable. The positioning of ripcords enables easy mid-span access.
,CLAIMS:What is claimed is:

1. A pre-ducted optical fiber cable assembly (100) comprising:

at least one optical fiber cable (102) positioned substantially along a longitudinal axis (146) of the pre-ducted optical fiber cable assembly (100), the at least one optical fiber cable (102) comprising:

at least one buffer tube (108a-108d), wherein the at least one buffer tube (108a-108d) encloses at least one optical fiber (110a-110d);

a cable jacket (118-120), wherein the cable jacket (118-120) has a dual layer jacket (118-120), wherein the cable jacket (118-120) comprises:

a third layer (118) surrounding a second layer (116), wherein the third layer (118) is made of polyethylene;

a fourth layer (120) surrounding the third layer (118), wherein the fourth layer (120) is made of polyamide, wherein the fourth layer (120) is bonded with the third layer (118), wherein the cable jacket (118-120) is made of polyethylene and polyamide for termite protection and rodent protection;

a duct (104) enclosing the at least one optical fiber cable (102), wherein the duct (104) is made of high density polyethylene, wherein an inner surface of the duct (104) is coated with a low friction silicon coating (124), wherein the low friction silicon coating (124) is provided for reducing friction between the duct (104) and the at least one optical fiber cable (102), wherein the duct (104) has a fill factor in a range of about 23.20% to 46.86% without the low friction silicon coating (124); and

at least one ripcord (122a-122b) positioned in a free space (150) between the duct (104) and the at least one optical fiber cable (102) and lying substantially along the longitudinal axis (146) of the pre-ducted optical fiber cable assembly (100).

2. The pre-ducted optical fiber cable assembly (100) as recited in claim 1, further comprising a central strength member (106) lying substantially along the longitudinal axis (148) of the optical fiber cable (102), wherein the central strength member (106) is made of flexible fiber reinforced plastic and wherein the central strength member (106) has a diameter in a range of about 1.5 millimeters – 2.0 millimeters.

3. The pre-ducted optical fiber cable assembly (100) as recited in claim 1, further comprising a plurality of buffer tubes (108a-108d) stranded around a central strength member (106) and lying substantially along the longitudinal axis (148) of the optical fiber cable (102) and wherein each of the plurality of buffer tubes (108a-108d) is made of a thermoplastic material and wherein the thermoplastic material used for the plurality of buffer tubes (108a-108d) is polybutylene terephthalate.

4. The pre-ducted optical fiber cable assembly (100) as recited in claim 1, further comprising a filler (112), wherein the filler (112) lies substantially along the longitudinal axis (148) of the at least one optical fiber cable (102) and wherein the filler (112) has a diameter in a range of about 1.5 millimeters – 2.0 millimeters.

5. The pre-ducted optical fiber cable assembly (100) as recited in claim 1, further comprising a first layer (114) surrounding the at least one buffer tube (108a-108d) and a filler (112), wherein the first layer (114) is a water blocking tape layer (114) and wherein the first layer (114) has a thickness in a range of about 0.2 millimeter – 0.4 millimeter.

6. The pre-ducted optical fiber cable assembly (100) as recited in claim 1, further comprising a second layer (116) surrounding a first layer (114), wherein the second layer (116) is an armoring layer, wherein the armoring layer is made of electrolytic chrome-coated steel tape and wherein the second layer (116) has a thickness in a range of about 0.125 millimeter – 0.155 millimeter.

7. The pre-ducted optical fiber cable assembly (100) as recited in claim 1, wherein the cable jacket (118-120) surrounds a second layer (116).

8. The pre-ducted optical fiber cable assembly (100) as recited in claim 1, wherein the ripcords (122a-122b) are positioned 180 degrees apart from each other and wherein each of the two ripcords (122a-122b) are made of polyester based twisted yarns.

9. The pre-ducted optical fiber cable assembly (100) as recited in claim 1, further comprising a plurality of dielectric strength members (144a-144b) embedded in the duct (104), wherein the plurality of dielectric strength members (144a-144b) extends along length of the duct (104) and parallel to the longitudinal axis (146) of the pre-ducted optical fiber cable assembly (100), wherein the plurality of dielectric strength members (144a-144b) are positioned approximately 180 degrees apart and diagonally opposite from each other, wherein the plurality of dielectric strength members (144a-144b) is made of a material selected from a group consisting of steel and fiber reinforced plastic and wherein the plurality of dielectric strength members (144a-144b) has a diameter in a range of about 1 millimeters - 2 millimeters.

10. The pre-ducted optical fiber cable assembly (100) as recited in claim 1, wherein the at least one buffer tube has a thickness in a range of about 0.15 millimeter – 0.4 millimeters.

11. The pre-ducted optical fiber cable assembly (100) as recited in claim 1, wherein the at least one buffer tube has a first diameter in a range of about 1.3 millimeters – 1.6 millimeters.

12. The pre-ducted optical fiber cable assembly (100) as recited in claim 1, wherein the at least one buffer tube has a second diameter in a range of about 1.5 millimeters – 2.0 millimeters.

13. The pre-ducted optical fiber cable assembly (100) as recited in claim 1, further comprising gel, wherein the gel is filled inside the at least one buffer tube (108a-108d), wherein the gel is a thixotropic gel and prevents ingression of water inside the at least one buffer tube.

14. The pre-ducted optical fiber cable assembly (100) as recited in claim 1, wherein the third layer (118) has a thickness in a range of about 1.0 millimeter - 1.6 millimeters.

15. The pre-ducted optical fiber cable assembly (100) as recited in claim 1, wherein the fourth layer (120) has a thickness in a range of about 0.3 millimeter - 0.5 millimeter.

16. The pre-ducted optical fiber cable assembly (100) as recited in claim 1, wherein the low friction silicon coating (124) has a thickness in a range of about 0.2 millimeter - 0.4 millimeter.

17. The pre-ducted optical fiber cable assembly (100) as recited in claim 1, wherein the duct (104) has a diameter in a range of about 20 millimeters - 40 millimeters.

18. The pre-ducted optical fiber cable assembly (100) as recited in claim 1, wherein the duct (104) has a thickness in a range of about 2 millimeters - 4 millimeters.

19. The pre-ducted optical fiber cable assembly (100) as recited in claim 1, wherein the at least one optical fiber cable (102) has a diameter in a range of about 11.5 millimeters ± 0.5 millimeter.

20. The pre-ducted optical fiber cable assembly (100) as recited in claim 1, wherein the at least one optical fiber cable (102) has weight in a range of about 100 Kg/Km ± 5 percent.

21. The pre-ducted optical fiber cable assembly (100) as recited in claim 1, wherein the at least one optical fiber cable (102) has a maximum tensile strength of 2670 Newton.

22. The pre-ducted optical fiber cable assembly (100) as recited in claim 1, wherein the at least one optical fiber cable (102) has a minimum bend radius of 20D.

23. The pre-ducted optical fiber cable assembly (100) as recited in claim 1, wherein the at least one optical fiber cable (102) has a crush resistance of 2000N/100*100 mm.

24. The pre-ducted optical fiber cable assembly (100) as recited in claim 1, wherein the at least one optical fiber cable (102) has a cable length in a range of about 2 Km ± 5 percent.

25. The pre-ducted optical fiber cable assembly (100) as recited in claim 1, wherein the at least one optical fiber cable (102) has torsion of ± 180 degrees.

26. The pre-ducted optical fiber cable assembly (100) as recited in claim 1, wherein the pre-ducted optical fiber cable assembly (100) has a diameter in a range of about 25.3 millimeters ± 0.5 millimeter.

27. The pre-ducted optical fiber cable assembly (100) as recited in claim 1, wherein the pre-ducted optical fiber cable assembly (100) has weight in a range of about 310 Kg/Km ± 5 percent.

28. The pre-ducted optical fiber cable assembly (100) as recited in claim 1, wherein the pre-ducted optical fiber cable assembly (100) has a maximum tensile strength of 4000 Newton.

29. The pre-ducted optical fiber cable assembly (100) as recited in claim 1, wherein the pre-ducted optical fiber cable assembly (100) has a minimum bend radius of 20D.

30. The pre-ducted optical fiber cable assembly (100) as recited in claim 1, wherein the pre-ducted optical fiber cable assembly (100) has a crush resistance of 5000N/100*100 mm.

31. The pre-ducted optical fiber cable assembly as recited in claim 1, wherein the pre-ducted optical fiber cable assembly (100) has torsion of ± 180 degrees.

32. The pre-ducted optical fiber cable assembly as recited in claim 1, wherein pre-ducted optical fiber cable assembly (202, 204) of a plurality of pre-ducted optical fiber cable assemblies defined along a longitudinal axis (208) is grouped with a planar cross section, wherein the grouped optical fiber cable assemblies are enclosed longitudinally by a fifth layer (206) along a length of the grouped optical fiber cable assemblies.