TECHNICAL FIELD
 The present disclosure relates to the field of optical waveguide cable and, in particular, relates to an optical waveguide ribbon duct cable with improved blowing performance.
BACKGROUND
 The optical waveguide cables have secured an important position in building network of modern communication systems across the world. One such type of optical waveguide cables are optical waveguide ribbon cables. These optical waveguide ribbon cables are installed in ducts. These optical waveguide ribbon cables include a plurality of optical waveguide ribbons. Each optical waveguide ribbon includes a number of optical waveguides placed adjacent and bonded together with a matrix material. These optical waveguide ribbons may be held inside a plurality of cylindrical enclosures which may be covered by additional layers. Typically, these optical waveguide ribbon cables include a central robust component which may also be covered by additional layers.
 The currently available optical waveguide ribbon cables have several drawbacks. These prior art optical waveguide cables are difficult to blow inside the duct due to high friction offered by the cable due to the design of the cable. Conventionally available optical waveguide ribbon cables have high attenuation in the cable and high losses in the optical waveguide ribbon. The existing optical waveguide ribbon cables are heavy and difficult to install. The pulling force in the existing optical waveguide cables is high due to circular shape of the cable.
Page 3/38
 In light of the foregoing discussion, there exists a need for an optical waveguide cable which overcomes the above cited drawbacks of conventionally known optical waveguide cables.
OBJECT OF THE DISCLOSURE
 A primary object of the disclosure is to provide an optical waveguide ribbon duct cable with improved blowing performance.
 Another object of the present disclosure is optimisation of lay length of optical waveguide ribbon or optical waveguide.
 Yet another object of the present disclosure is to reduce attenuation in the optical waveguide cable.
 Yet another object of the present disclosure is optimisation of lay length of cylindrical enclosure.
 Yet another object of the present disclosure is to reduce the losses in the optical waveguide ribbons.
 Yet another object of the present disclosure is to improve the tensile strength of the optical waveguide cable.
 Yet another object of the present disclosure is to provide an optical waveguide ribbon duct cable with reduced weight.
Page 4/38
SUMMARY
 In an aspect, the present disclosure provides an optical waveguide cable. The optical waveguide cable includes a central robust component lying substantially along a longitudinal axis of the optical waveguide cable. The optical waveguide cable includes at least one cylindrical enclosure stranded around the central robust component. Each of the at least one cylindrical enclosure may include at least one optical waveguide. The optical waveguide cable includes a first layer surrounding the central robust component. The optical waveguide cable includes a second layer concentric with the central robust component. The optical waveguide cable includes a third layer concentric with the central robust component. The optical waveguide cable includes at least one cylindrical enclosure stranded around the central robust component. In addition, the optical waveguide cable includes a fourth layer. The fourth layer surrounds the at least one cylindrical enclosure. The optical waveguide cable includes a fifth layer. The fifth layer surrounds the fourth layer. The optical waveguide cable includes a sixth layer. The sixth layer surrounds the fifth layer. The optical waveguide cable includes a seventh layer. The seventh layer surrounds the sixth layer. The optical waveguide cable includes an eighth layer. The eighth layer surrounds the seventh layer. The optical waveguide cable includes a seventh layer. The seventh layer surrounds the sixth layer. The optical waveguide cable includes one or more ripcord. The one or more ripcord is placed between the seventh layer and the eighth layer. The central robust component is made of fibre reinforced plastic. Each of the at least one cylindrical enclosure is characterized by a first lay length. The first lay length is in the range of 420 mm to 600 mm. The at least one cylindrical enclosure has a first radius in a
Page 5/38
range of about 3.1 mm ± 0.1 mm and a second radius in a range of about 4.0 mm ± 0.1 mm. The at least one cylindrical enclosure is made of medium density polyethylene. The at least one cylindrical enclosure includes a water blocking tape inside the at least one cylindrical enclosure. The water blocking tape has a thickness in a range of about 0.2 mm – 0.3 mm. The at least one cylindrical enclosure includes at least one optical waveguide. The at least one optical waveguide is helically arranged inside the cylindrical enclosure. The at least one optical waveguide has a radius in a range of about 100 microns to 125 microns. The at least one optical waveguide is characterized by a second lay length. The second lay length is in a range of about 600 mm to 900 mm. The eighth layer is ribbed against inner layers. The eighth layer reduces contact surface inside a duct, reduces friction and improves blowing performance of the optical waveguide cable. The optical waveguide of the at least one optical waveguide being characterized by a change in attenuation. The change in attenuation is around 0.05 decibels per kilometer at a wavelength of 1550 nm. The change in attenuation is measured in a temperature range of about -40°C to 70°C. The change in attenuation is measured for 2 temperature cycles. The optical waveguide cable has a maximum attenuation of less than 0.4 dB/Km at a wavelength of 1310 nm. The optical waveguide cable has a maximum attenuation of less than 0.4 dB/Km at a wavelength of 1383 nm. The optical waveguide cable has a maximum attenuation of less than 0.3 dB/Km at a wavelength of 1550nm.
 In an embodiment of the present disclosure, the central robust component has a radius of about 2.5 mm. The central robust
Page 6/38
component with the first layer has a diameter in a range of about 7.7 mm ± 0.1mm.
 In an embodiment of the present disclosure, the cylindrical enclosure of at least one cylindrical enclosure includes an at least one optical waveguide ribbon. Each of the optical waveguide ribbon of the at least one optical waveguide ribbon includes at least one optical waveguide. Each of the optical waveguide ribbon of the at least one optical waveguide ribbon with at least one optical waveguide is helically arranged inside each of the cylindrical enclosure of the at least one cylindrical enclosure.
 In an embodiment of the present disclosure, the first layer is made of a material selected from a group. The group consists of polyethylene, elastomer and low smoke zero halogen.
 In an embodiment of the present disclosure, the optical waveguide cable has a weight in a range of about 470kg/km ± 10% kg/km.
 In an embodiment of the present disclosure, the second layer is a water swellable tape. The second layer has a thickness in a range of about 0.25mm ± 0.05 mm.
 In an embodiment of the present disclosure, the third layer is a binder yarn. The third layer is made of a thread.
 In an embodiment of the present disclosure, the cylindrical enclosure has a density of less than 0.94 Kg/m3.
Page 7/38
 In an embodiment of the present disclosure, the fourth layer is a binder yarn. The fourth layer is arranged helically in clockwise direction over each of the at least one cylindrical enclosure. The fourth layer is made of a thread.
 In an embodiment of the present disclosure, the fifth layer is a binder yarn. The fifth layer is arranged helically in opposite direction to the fourth layer in anti clockwise direction over the fourth layer. The fifth layer is a thread.
 In an embodiment of the present disclosure, the sixth layer is a water blocking tape surrounding the fifth layer. The sixth layer has a thickness in a range of about 0.5 mm ± 0.05 mm.
 In an embodiment of the present disclosure, the seventh layer is a helically arranged binder yarn. The seventh layer is a thread.
 In an embodiment of the present disclosure, the thread used in the third layer, fourth layer, fifth layer and seventh layer is made of polyester.
 In an embodiment of the present disclosure, the thread used in the third layer, fourth layer, fifth layer and seventh layer is made of polypropylene or any other material.
 In an embodiment of the present disclosure, the eighth layer is a UV proof outer sheath. The eighth layer is made up of high
Page 8/38
density polyethylene having a density greater than or equal to 0.94 gm/cm3. The eighth layer has a thickness in a range of about 1.6 mm to 2.2 mm.
 In an embodiment of the present disclosure, the eighth layer may be hexagonal or ribbed or circular in shape.
 In an embodiment of the present disclosure, the optical waveguide has a short term tensile strength of 2700 newton’s and long term tensile strength of 890 newton’s.
 In an embodiment of the present disclosure, the at least one cylindrical enclosure may be replaced with at least one filler.
 In an embodiment of the present disclosure, the optical waveguide has a dispersion of less than 0.2 ps/nm.km.
 In an embodiment of the present disclosure, the optical waveguide cable includes 288 optical waveguides.
 In an embodiment of the present disclosure, the optical waveguide cable includes 432 optical waveguides.
 In an embodiment of the present disclosure, the optical waveguide cable includes 720 optical waveguides.
 In an embodiment of the present disclosure, the optical waveguide cable includes 1152 optical waveguides.
Page 9/38
 In an embodiment of the present disclosure, the optical waveguide cable includes 1728 optical waveguides.
 In an embodiment of the present disclosure, the optical waveguide cable includes 864 optical waveguides. The 864 optical waveguides being arranged in the optical waveguide ribbons in each of the cylindrical enclosures.
 In an embodiment of the present disclosure, the cylindrical enclosure of the at least one cylindrical enclosures may comprise a plurality of individual optical waveguides.
 In an embodiment of the present disclosure, the optical waveguide cable with 864 optical waveguides has a diameter in a range of about 28 mm ± 1 mm. The optical waveguide cable has a variable diameter for variable number of optical waveguides present inside the cylindrical enclosure of the optical waveguide cable.
 In an embodiment of the present disclosure, the at least one optical waveguide arranged in a plurality of optical waveguide ribbons has a loss of less than 0.22 dB/km at a wavelength of 1550nm and a loss of less than 0.25 dB/km at a wavelength of 1625nm.
STATEMENT OF THE DISCLOSURE
 In an aspect, the present disclosure provides an optical waveguide cable. The optical waveguide cable includes a central robust component lying substantially along a longitudinal axis of the optical waveguide cable. The optical waveguide cable includes at
Page 10/38
least one cylindrical enclosure stranded around the central robust component. Each of the at least one cylindrical enclosure may include at least one optical waveguide. The optical waveguide cable includes a first layer surrounding the central robust component. The optical waveguide cable includes a second layer concentric with the central robust component. The optical waveguide cable includes a third layer concentric with the central robust component. The optical waveguide cable includes at least one cylindrical enclosure stranded around the central robust component. In addition, the optical waveguide cable includes a fourth layer. The fourth layer surrounds the at least one cylindrical enclosure. The optical waveguide cable includes a fifth layer. The fifth layer surrounds the fourth layer. The optical waveguide cable includes a sixth layer. The sixth layer surrounds the fifth layer. The optical waveguide cable includes a seventh layer. The seventh layer surrounds the sixth layer. The optical waveguide cable includes an eighth layer. The eighth layer surrounds the seventh layer. The optical waveguide cable includes a seventh layer. The seventh layer surrounds the sixth layer. The optical waveguide cable includes one or more ripcord. The one or more ripcord is placed between the seventh layer and the eighth layer. The central robust component is made of fibre reinforced plastic. Each of the at least one cylindrical enclosure is characterized by a first lay length. The first lay length is in the range of 420 mm to 600 mm. The at least one cylindrical enclosure has a first radius in a range of about 3.1 mm ± 0.1 mm and a second radius in a range of about 4.0 mm ± 0.1 mm. The at least one cylindrical enclosure is made of medium density polyethylene. The at least one cylindrical enclosure includes a water blocking tape inside the at least one cylindrical enclosure. The water blocking tape has a thickness in a
Page 11/38
range of about 0.2 mm – 0.3 mm. The at least one cylindrical enclosure includes at least one optical waveguide. The at least one optical waveguide is helically arranged inside the cylindrical enclosure. The at least one optical waveguide has a radius in a range of about 100 microns to 125 microns. The at least one optical waveguide is characterized by a second lay length. The second lay length is in a range of about 600 mm to 900 mm. The eighth layer is ribbed against inner layers. The eighth layer reduces contact surface inside a duct, reduces friction and improves blowing performance of the optical waveguide cable. The optical waveguide of the at least one optical waveguide being characterized by a change in attenuation. The change in attenuation is around 0.05 decibels per kilometer at a wavelength of 1550 nm. The change in attenuation is measured in a temperature range of about -40°C to 70°C. The change in attenuation is measured for 2 temperature cycles. The optical waveguide cable has a maximum attenuation of less than 0.4 dB/Km at a wavelength of 1310 nm. The optical waveguide cable has a maximum attenuation of less than 0.4 dB/Km at a wavelength of 1383 nm. The optical waveguide cable has a maximum attenuation of less than 0.3 dB/Km at a wavelength of 1550nm.
Page 12/38
BRIEF DESCRIPTION OF FIGURES
 Having thus described the disclosure in general terms, reference will now be made to the accompanying figures, wherein:
 FIG. 1A illustrates a cross sectional view of an optical waveguide cable, in accordance with an embodiment of the present disclosure; and
 FIG. 1B illustrates a cross sectional view of another optical waveguide cable, in accordance with another embodiment of the present disclosure.
 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  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
Page 13/38
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.
 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.
 FIG. 1A illustrates a cross-sectional view of an optical waveguide cable 100 for indoor and outdoor applications, in accordance with various embodiments of the present disclosure. The cross sectional view describes a layered structure and distribution of discrete elements of the optical waveguide cable 100. The layered structure of the optical waveguide cable 100 includes a central robust component 102 and a plurality of layers 104a-104c surrounding the central robust component 102. The plurality of layers 104a-104cincludes a first layer 104a, a second layer 104b and a third layer 104c. In addition, the optical waveguide cable100 includes a plurality of cylindrical enclosures 106 and a water blocking tape 108. The water blocking tape 108 is present inside each of the plurality of cylindrical enclosures 106. In addition, the optical waveguide cable 100 includes a plurality of optical waveguides 110 present inside each of the plurality of cylindrical enclosures 106. The plurality of optical waveguides 110 can be plurality of optical waveguide
Page 14/38
ribbons. Further, the optical waveguide cable 100 includes a fourth layer 112, a fifth layer 114 and a sixth layer 116. Furthermore, the optical waveguide cable 100 includes a seventh layer 118, an eighth layer 120 and a plurality of ripcords 122. The above combination of structural elements enables an improvement in a plurality of parameters of the optical waveguide cable 100. The plurality of parameters includes installation efficiency, attenuation, cable weight, tensile strength, crush resistance and bending radius.
 The optical waveguide cable 100 includes a central robust component 102 (as shown in FIG. 1A and FIG. 1B). The central robust component 102 is positioned substantially at the centre of the optical waveguide cable 100. The centre of the central robust component 102 lies along the longitudinal axis throughout the length of the optical waveguide cable 100.The longitudinal axis is an imaginary axis passing through the centre of the optical waveguide cable 100 throughout the entire length of the optical waveguide cable 100. The central robust component 102 extends substantially along the entire length of the optical waveguide cable 100. The central robust component 102 is positioned in the core of the optical waveguide cable 100. The central strength component 102 provides tensile strength and anti-buckling properties to the optical waveguide cable 100. The central robust component 102 is made of fibre reinforced plastic (FRP). The central robust component 102 has a radius of about 2.5 mm.
 The optical waveguide cable 100 includes a plurality of layers 104a-104c surrounding the central robust component 102. The optical waveguide cable 100 includes the first layer 104a. The
Page 15/38
first layer 104a surrounds the central robust component 102. The central robust component 102 along with first layer 104a has a diameter in a range of about 7.7 mm ± 0.1 mm. In an embodiment of the present disclosure, the thickness of the first layer 104a may vary. In an embodiment of the present disclosure, the first layer 104a is made of polyethylene. In another embodiment of the present disclosure, the first layer 104a is made of elastomer. In yet another embodiment of the present disclosure, the first layer 104a is made of low smoke zero halogen (LSZH). The first layer 104a surrounds the central robust component 102 and provides mechanical strength and flexibility to the central robust component 102. The first layer 104a helps to accommodate the plurality of cylindrical enclosures around the central robust component. The first layer 104a maintains the proper coverage of cylindrical enclosures over central robust component which in turn helps for maintaining standard attenuation changes. The first layer 104a has a thickness in a range of about 1.3 mm to 1.4 mm. The first layer 104a may have any other suitable thickness.
 The optical waveguide cable 100 includes the second layer 104b. The second layer 104b is concentric with the central robust component 102. The second layer 104b surrounds the first layer 104a. The second layer 104b is a water swellable tape. The second layer104b has a thickness in a range of about 0.25 mm ± 0.05 mm. The second layer 104b is use to prevent the water ingress inside the core of the optical waveguide cable 100. In an embodiment of the present disclosure, the thickness of the second layer 104b may vary.
Page 16/38
 The optical waveguide cable 100 includes the third layer 104c. The third layer 104c is concentric with the central robust component 102. The third layer 104c surrounds the second layer 104b. The third layer 104c is a binder yarn. The third layer104c is type of a thread. In an embodiment of the present disclosure, the third layer 104c can have any suitable linear density. Linear density is defined as mass per unit length of thread.
 The optical waveguide cable 100 includes at least one cylindrical enclosure 106. The plurality of cylindrical enclosures 106 are positioned around the central robust component 102. The plurality of cylindrical enclosures 106 is variable in number. In an embodiment of the present disclosure, one or more cylindrical enclosures 106 can be replaced with one or more fillers. In an embodiment of the present disclosure, the plurality of cylindrical enclosures 106 can be twelve in number. The twelve cylindrical enclosures 106 will be arranged in two different layers surrounding the central robust component 102. Each of the plurality of cylindrical enclosures 106 has a first radius in a range of about 3.1 mm ± 0.1 mm and a second radius in a range of about 4.0 mm ± 0.1 mm. The first radius is an inner radius of the plurality of cylindrical enclosures 106. The second radius is an outer radius of the plurality of cylindrical enclosures 106. Each of the plurality of cylindrical enclosures 106 can have any other suitable value of inner radius and outer radius as per the number of plurality of optical waveguides to be accommodated. Each of the plurality of cylindrical enclosures 106 is made of medium density polyethylene. The cylindrical enclosure has a density of less than 0.94 Kg/m3. In an embodiment of the present disclosure, the plurality of cylindrical enclosure 106 is
Page 17/38
made of thermoplastic material (PBTB). In an embodiment of the present disclosure, the plurality of cylindrical enclosures 106 is made of any other suitable material.
 Each of the plurality of cylindrical enclosures 106 has a first lay length. The first lay length of each of the cylindrical enclosure 106 is in a range of about 420 mm to 600 mm. The average lay length is defined by the distance between reversal points divided by the number of turns between reversals of the cylindrical enclosures 106. To ensure that the optical waveguides within the cylindrical enclosures 106 are not subjected to bending stress, which may cause unwanted attenuation, the lay length needs to be monitored. Moreover, during compressive strengthening, there is shrinkage in the cylindrical enclosure 106. The optimization of lay length of the cylindrical enclosure 106 helps to maintain cable attenuations in limit during the shrinkage in the cylindrical enclosure 106.
 In an embodiment of the present disclosure, the optical waveguide cable 100 includes plurality of coloured cylindrical enclosures 106. The colour of each of the plurality of cylindrical enclosures 106 is selected from a group. The group includes blue, orange, green, brown, slate and white. The cylindrical enclosures 106 may have any other colour depending upon the requirement. Each of the at least one cylindrical enclosure 106 includes the water blocking tape 108 inside the at least one cylindrical enclosure 106. The water blocking tape 108 has a thickness in a range of about 0.2 mm – 0.3 mm. In an embodiment of the present disclosure, the water blocking tape may have any other suitable thickness.
Page 18/38
 The optical waveguide cable 100 includes the at least one optical waveguide 110. In general, the plurality of optical waveguides 110 are sandwiched, encapsulated, and/or edge bonded to form an optical-waveguide ribbon. In general, each of the plurality of optical waveguides 110 in the plurality of optical waveguide ribbons is a waveguide used for transmitting information as light pulses from one end of the optical waveguide cable 100 to another end of the optical waveguide cable 100. In addition, each of the plurality of optical waveguides 110 is a thin strand of glass capable of transmitting optical signals. Also, each of the plurality of optical waveguides 110 is configured to transmit large amounts of information over long distances with relatively low attenuation. Further, each of the plurality of optical waveguides 110 includes a core region and a cladding region. The core region is an inner part of an optical waveguide and the cladding section is an outer part of the optical waveguide. Moreover, the core region is defined by a central longitudinal axis of each of the plurality of optical waveguides 110. In addition, the cladding region surrounds the core region.
 In an embodiment of the present disclosure, the number of optical waveguides in one ribbon is fixed. In another embodiment of the present disclosure, the number of optical waveguides in one ribbon may vary. Further, the plurality of optical-waveguides ribbons is aggregated to form a ribbon stack. The ribbon stack has various sizes and shapes. In an embodiment of the present disclosure, optical waveguide ribbons are arranged to form a rectangular ribbon stack. In another embodiment of the present
Page 19/38
disclosure, the plurality of optical waveguide ribbons may arrange to form any different shape ribbon stack.
 Each of the plurality of optical waveguide 110 is helically arranged inside the cylindrical enclosure 106. Each of the plurality of cylindrical enclosures 106 includes the at least one optical waveguide 110 or optical waveguide ribbon. In an embodiment of the present disclosure, the optical waveguide ribbon is helically arranged inside the cylindrical enclosure 106. Each of the plurality of optical waveguide 110 has a radius in a range of about 100 microns to 125 microns. Each of the plurality of optical waveguide 110 is characterized by a second lay length. The second lay length of each of the plurality of optical waveguide 110 is in a range of about 600 mm to 900 mm. When the optical waveguide/optical waveguide ribbon is twisted helically inside the cylindrical enclosures about the longitudinal axis of cylindrical enclosures, the longitudinal distance along the cylindrical enclosure required for one complete helical twist is defined as optical waveguide/optical waveguide ribbon lay length. Lesser lay length of optical waveguide ribbon results in increase of turns in particular length of ribbon and might deform the ribbon. The stresses will be concentrated at the twisting point of optical waveguide ribbon. As the number of turns increases, stress concentration points increases within unit length of the optical waveguide ribbon. Higher lay length of optical waveguide ribbon means the number of turns in particular length of cable is less. When the optical waveguide cable is rounded on the barrel, it creates improper stress distribution & increases stress towards that stress concentrated points. In an embodiment of the present disclosure, the optical waveguide ribbon lay length is
Page 20/38
optimized for proper distribution of stresses throughout the optical waveguide cable length around drum barrel without effecting the attenuation changes in the optical waveguides.
 In an embodiment of the present disclosure, the optical waveguide 110 is characterized by a change in attenuation. The change in attenuation of optical waveguide 110 is around 0.05 decibels per kilometre at a wavelength of 1550 nanometres. The change in attenuation is measured in a temperature range of about -40°C to 70°C. The change in attenuation is measured for 2 temperature cycles. In an embodiment of the present disclosure, the temperature cycling to check the attenuation is conducted according to IEC-60794-1-2-F1, FOTP-3 and GR-20 requirements. In an embodiment of the present disclosure, the sample is pre conditioned under ambient condition for around 24 hours, before starting the test determine the test soak time. Soak time is defined as the time required for the sample to reach thermal equilibrium after the air in the chamber has reached the specified temperature. All the apparatus and method adopted for performing the temperature cycling complies with these standards. The waveguide attenuation corresponds to a loss in optical power as the light travels through the optical waveguide. In an embodiment of the present disclosure, the plurality of optical waveguides 110 in the plurality of optical waveguide ribbons is single mode optical waveguides. In another embodiment of the present disclosure, the plurality of optical waveguides 110 in the plurality of optical waveguide ribbons is multi-mode optical waveguides.
Page 21/38
 The optical waveguide has a short term tensile strength of 2700 Newton’s and long term tensile strength of 890 Newton’s. The tensile strength is a measure of the maximum stress that the Optical waveguide can withstand when a tensile force is applied on the optical waveguide.
 The optical waveguide 110 has a dispersion of less than 0.2 ps/nm.km. The dispersion corresponds to a spreading of the optical signals over time.
 In an embodiment of the present disclosure, the optical waveguide ribbon undergoes losses of less than 0.22 dB/km at a wavelength of 1550 nm. In another embodiment of the present disclosure, the optical waveguide ribbon has losses of less than 0.25 dB/km at a wavelength of 1625 nm.
 The optical waveguide cable 100 includes the fourth layer 112, the fifth layer 114 and the sixth layer 116. The fourth layer 112 surrounds each of the plurality of cylindrical enclosures 106. The fourth layer 112 is a binder yarn. The fourth layer 112 is arranged helically in clockwise direction over each of the plurality of cylindrical enclosures 106. The fourth layer 112 is made of a thread.
 The optical waveguide cable 100 includes the fifth layer 114. The fifth layer 114 surrounds the fourth layer 112. The fifth layer 114 is a binder yarn. The fifth layer 114 is arranged helically in opposite direction to the fourth layer 112 that is in anti-clockwise direction over the fourth layer 112. The fifth layer 114 is a thread.
Page 22/38
 The optical waveguide cable 100 includes the sixth layer 116. The sixth layer 116 surrounds the fifth layer 114. The sixth layer 116 is a water blocking tape. In an embodiment of the present disclosure, the sixth layer 116 has a thickness in a range of about 0.5 mm + 0.05 mm. The water blocking tape is used to prevent the water from entering inside the cylindrical enclosures.
 The optical waveguide cable 100 includes the seventh layer 118. The seventh layer 118 surrounds the sixth layer 116. The seventh layer 118 is a helically arranged binder yarn. The seventh layer 118 is a thread.
 The optical waveguide cable 100 includes the eighth layer 120. The eighth layer 120 surrounds the seventh layer 118. The eighth layer 120 is ribbed against the inner layers. The eighth layer 120 reduces the contact surface of the optical waveguide cable 100 inside the duct. The eighth layer 120 helps in reducing the friction and improves the blowing performance of optical waveguide cable 100. The eighth layer 120 is a UV proof outer sheath. The eighth layer 120 is made up of high density polyethylene having a density greater than or equal to 0.94 gm/cm3. The eighth layer 120 has a thickness in a range of about 1.6 mm to 2.2 mm. The eighth layer 120 may be hexagonal or ribbed in shape. The eighth layer 120 may be circular in shape (as shown in Fig. 1B). In an embodiment of the present disclosure, the eighth layer 120 might have any suitable thickness. The optical waveguide cable 100 includes a plurality of ripcords 122. The plurality of ripcords 122 are positioned between
Page 23/38
the seventh layer 118 and the eighth layer 120. Each of the plurality of ripcords 122 is made of polyester based yarns.
 The optical waveguide cable 100 is used for installation in ducts. The optical waveguide cable 100 is used for indoor and outdoor applications. The optical waveguide cable 100 is a ribbon type optical waveguide cable. In an embodiment of the present disclosure, the optical waveguide cable 100 has a short term tensile strength of about 2700 Newton’s (600 lbf) and long term tensile strength of about 890 Newton’s (200 lbf). In an embodiment of the present disclosure, the minimum bending radius of the optical waveguide cable 100 during installation is 20 D and during operation is 15 D. In an embodiment of the present disclosure, the crush resistance of the optical waveguide cable 100 is about 2200 Newton per 100 millimetres (450 lbf/3.93 inch). In an embodiment of the present disclosure, the impact strength of the optical waveguide cable 100 is 25 Newton meter (220 lbf-in). In an embodiment of the present disclosure, the torsion of the optical waveguide cable 100 is ± 180 degree. In an embodiment of the present disclosure, the temperature performance of the optical waveguide cable 100 during installation is in the range of -30 degree Celsius to 70 degree Celsius. In an embodiment of the present disclosure, the temperature performance of the optical waveguide cable 100 during operation is in the range of -40 degree Celsius to 70 degree Celsius. In an embodiment of the present disclosure, the temperature performance of the optical waveguide cable 100 during storage is in the range of -40 degree Celsius to 70 degree Celsius. In another embodiment of the present disclosure, the optical waveguide cable 100 has any suitable value or range of crush resistance, impact strength, torsion,
Page 24/38
tensile strength, minimum bending radius and temperature performance.
 The optical waveguide cable 100 has a maximum attenuation of less than 0.4 dB/Km at a wavelength of 1310nm. The optical waveguide cable 100 has a maximum attenuation of less than 0.4 dB/Km at a wavelength of 1383 nm. The optical waveguide cable 100 has a maximum attenuation of less than 0.3 dB/Km at a wavelength of 1550nm. The optical waveguide cable 100 has a weight of about 470 kg/km ± 10%kg/km. In an embodiment of the present disclosure, the optical waveguide cable 100 includes 864 optical waveguides. In an embodiment of the present disclosure, the optical waveguide cable 100 includes 288 optical waveguides. In an embodiment of the present disclosure, the optical waveguide cable 100 includes 432 optical waveguides. In an embodiment of the present disclosure, the optical waveguide cable 100 includes 720 optical waveguides. In an embodiment of the present disclosure, the optical waveguide cable 100 includes 1152 optical waveguides. In an embodiment of the present disclosure, the optical waveguide cable 100 includes 1728 optical waveguides. In an embodiment of the present disclosure, the optical waveguides are arranged in optical waveguide ribbons inside the optical waveguide cable 100. In an embodiment of the present disclosure, the optical waveguide cable with 864 optical waveguides has a diameter in a range of about 28 mm + 1 mm. In an embodiment of the present disclosure, the optical waveguide cable has a variable diameter for variable number of optical waveguides present inside the cylindrical enclosure of the optical waveguide cable.
Page 25/38
 In an embodiment of the present disclosure, the optical waveguide cable 100 includes a plurality of colored optical waveguides. The color of each of the plurality of optical waveguides 110 is selected from a group. The group includes blue, orange, green, brown, slate, white, red, black, yellow, violet, pink and aqua. The plurality of optical waveguides 110 is present inside the cylindrical enclosure 106.
 In an embodiment of the present disclosure, the total number of optical waveguide ribbons is 16. The optical waveguide ribbons present per cylindrical enclosure are 4. The optical waveguides present per optical waveguide ribbon are 12. The total number of cylindrical enclosure present in the optical waveguide cable 100 is 4. The total number of waveguides present per cylindrical enclosure is 48 (12*4= 48). The total number of waveguides in the optical waveguide cable 100 is 192 (12*16= 192). The number of fillers present in the optical waveguide cable is 2. In an embodiment of the present disclosure, the diameter of the optical waveguide cable 100 corresponding to 192 optical waveguides is about 21 ± 1millimeters. The weight of the optical waveguide cable 100 corresponding to 192 optical waveguides is 236 ± 10% kilograms per kilometer.
 In an embodiment of the present disclosure, the total number of optical waveguide ribbons is 18. The optical waveguide ribbons are present two different groups. In four cylindrical enclosures, the optical waveguide ribbon present per cylindrical enclosure is 4. In one cylindrical enclosure, the optical waveguide ribbons are 2. The optical waveguides present per optical waveguide
Page 26/38
ribbon are 12. The total number of cylindrical enclosure present in the optical waveguide cable 100 is 5. The total number of waveguides present per cylindrical enclosure from first group is 48 (12*4= 48). The total number of optical waveguides present per cylindrical enclosure from second group is 24 (12*2). The total number of waveguides in the optical waveguide cable 100 is 216 (12*18= 216). The number of fillers present in the optical waveguide cable is 1. In an embodiment of the present disclosure, the diameter of the optical waveguide cable 100 corresponding to 216 optical waveguides is in a range about 21 mm ± 1 mm. The weight of the optical waveguide cable 100 corresponding to 216 optical waveguides is 252 kg/km ± 10% kg/km. In an embodiment of the present disclosure, the total number of optical waveguide ribbons is 18. The optical waveguide ribbons can also be a single type of group. In an embodiment of the present disclosure, in six cylindrical enclosures, the optical waveguide ribbon present per cylindrical enclosure is 3. In another embodiment of the present disclosure, the optical waveguides present per optical waveguide ribbon are 12. The total number of cylindrical enclosure present in the optical waveguide cable 100 is 6. The total number of waveguides present per cylindrical enclosure from first group is 36 (12*3= 36). The total number of waveguides in the optical waveguide cable 100 is 216 (12*18= 216). The number of fillers present in the optical waveguide cable is 0. In an embodiment of the present disclosure, the diameter of the optical waveguide cable 100 corresponding to 216 optical waveguides is in a range of about 21 mm ± 1 mm. The weight of the optical waveguide cable 100 corresponding to 216 optical waveguides is 252 kg/km ± 10% kg/km.
Page 27/38
 In an embodiment of the present disclosure, the total number of optical waveguide ribbons is 24. The optical waveguide ribbons present per cylindrical enclosure are 4. The optical waveguides present per optical waveguide ribbon are 12. The total number of cylindrical enclosure present in the optical waveguide cable 100 is 6. The total number of waveguides present per cylindrical enclosure is 48 (12*4= 48). The total number of waveguides in the optical waveguide cable 100 is 288 (12*24= 288). The number of fillers present in the optical waveguide cable is 0. In an embodiment of the present disclosure, the diameter of the optical waveguide cable 100 corresponding to 288 optical waveguides is in a range of about 21 mm ± 1 mm. The weight of the optical waveguide cable 100 corresponding to 288 optical waveguides is 274 kg/km ± 10% kg/km.
 In an embodiment of the present disclosure, the total number of optical waveguide ribbons is 36. The optical waveguide ribbons present per cylindrical enclosure are 6. The optical waveguides present per optical waveguide ribbon are 12. The total number of cylindrical enclosure present in the optical waveguide cable 100 is 6. The total number of waveguides present per cylindrical enclosure is 72 (12*6= 72). The total number of waveguides in the optical waveguide cable 100 is 432 (12*36= 432). The number of fillers present in the optical waveguide cable is 0. In an embodiment of the present disclosure, the diameter of the optical waveguide cable 100 corresponding to 432 optical waveguides is in a range of about 22.5 mm ± 1mm. The weight of the optical
Page 28/38
waveguide cable 100 corresponding to 432 optical waveguides is 311 kg/km ± 10% kg/km.
 In an embodiment of the present disclosure, the total number of optical waveguide ribbons is 48. The optical waveguide ribbons present per cylindrical enclosure are 12. The optical waveguides present per optical waveguide ribbon are 12. The total number of cylindrical enclosure present in the optical waveguide cable 100 is 4. The total number of waveguides present per cylindrical enclosure is 144 (12*12= 144). The total number of waveguides in the optical waveguide cable 100 is 576 (12*48= 576). The number of fillers present in the optical waveguide cable is 2. In an embodiment of the present disclosure, the diameter of the optical waveguide cable 100 corresponding to 576 optical waveguides is in a range about 28 mm ± 1 mm. The weight of the optical waveguide cable 100 corresponding to 576 optical waveguides is 469 kg/km ± 10% kg/km.
 In an embodiment of the present disclosure, the total number of optical waveguide ribbons is 72. The optical waveguide ribbons present per cylindrical enclosure are 12. The optical waveguides present per optical waveguide ribbon are 12. The total number of cylindrical enclosure present in the optical waveguide cable 100 is 6. The total number of waveguides present per cylindrical enclosure is 144 (12*12= 144). The total number of waveguides in the optical waveguide cable 100 is 864 (12*72= 864). The number of fillers present in the optical waveguide cable is 0. In an embodiment of the present disclosure, the diameter of the optical waveguide cable 100 corresponding to 864 optical waveguides is in
Page 29/38
a range of about 28 mm ± 1mm. The weight of the optical waveguide cable 100 corresponding to 864 optical waveguides is 469 kg/km ± 10% kg/km.
 The optical waveguide cable 100 of the present disclosure offers a number of advantages over the conventional cables. The optical waveguide cable 100 is easy to blow inside the duct due to low friction offered by the cable. The optical waveguide cable 100 optimises the ribbon stack lay length and cylindrical enclosure lay length. Moreover, the optical waveguide cable 100 has low attenuation in the cable and low losses in the optical waveguide ribbon. The optical waveguide cable 100is easy to install.
 The foregoing descriptions of specified embodiments of the present technology have been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the present technology to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the present technology and its practical application, to thereby enable others skilled in the art to best utilize the present technology and various embodiments with various modifications as are suited to the particular use contemplated. It is understood that various omissions and substitutions of equivalents are contemplated as circumstance may suggest or render expedient, but such are intended to cover the application or implementation without departing from the spirit or scope of the claims of the present technology.
Page 30/38
 While several possible embodiments of the disclosure have been described above and illustrated in some cases, it should be interpreted and understood as to have been presented only by way of illustration and example, but not by limitation. Thus, the breadth and scope of a preferred embodiment should not be limited by any of the above-described exemplary embodiments.

Claims
What is claimed is:
1. An optical waveguide cable (100) comprising:
a central robust component (102) lying substantially along a longitudinal axis of the optical waveguide cable (100), wherein the central robust component (102) is surrounded by a first layer (104a), wherein the central robust component (102) is surrounded by a second layer (104b), wherein the central robust component (102) is surrounded by a third layer (104c), wherein the central robust component (102) is made of fibre reinforced plastic;
at least one cylindrical enclosure (106) stranded around the central robust component (102), wherein each of the at least one cylindrical enclosure (106) is characterized by a first lay length, wherein the first lay length is in the range of 420 mm to 600 mm, wherein the at least one cylindrical enclosure (106) has a first radius in a range of about 3.1 mm ± 0.1 mm and a second radius in a range of about 4.0 mm ± 0.1 mm, wherein the at least one cylindrical enclosure (106) is made of medium density polyethylene, wherein the at least one cylindrical enclosure (106) comprises a water blocking tape (108) inside the at least one cylindrical enclosure (106), wherein the water blocking tape (108) has a thickness in a range of about 0.2 mm – 0.3 mm, wherein the at least one cylindrical enclosure (106) comprises at least one optical waveguide (110), wherein the at least one optical waveguide (110) is helically arranged inside the cylindrical enclosure (106), wherein the at least one optical waveguide (110) has a radius in a range of about 100 microns
Page 32/38
to 125 microns, wherein the at least one optical waveguide (11) is characterized by a second lay length, wherein the second lay length is in a range of about 600 mm to 900 mm;
a fourth layer (112) surrounding the at least one cylindrical enclosure (106);
a fifth layer (114) surrounding the fourth layer (112);
a sixth layer (116) surrounding the fifth layer (114);
a seventh layer (118) surrounding the sixth layer (116);
an eighth layer (120) surrounding the seventh layer (118), wherein the eighth layer (120) being ribbed against inner layers, wherein the eighth layer (120) reduces contact surface inside a duct, reduces friction and improves blowing performance of the optical waveguide cable (100); and
one or more ripcord (122), wherein the one or more ripcord (122) being placed between the seventh layer (118) and the eighth layer (120),
Page 33/38
wherein the at least one optical waveguide (110) being characterized by a change in attenuation, wherein the change in attenuation is around 0.05 decibels per kilometer at a wavelength of 1550 nanometers, wherein the change in attenuation being measured in a temperature range of about -40°C to 70°C, wherein the change in attenuation being measured for 2 temperature cycles,
wherein the optical waveguide cable (100) has a maximum attenuation of less than 0.4 dB/Km at a wavelength of 1310 nm, wherein the optical waveguide cable (100) has a maximum attenuation of less than 0.4 dB/Km at a wavelength of 1383nm and wherein the optical waveguide cable (100) has a maximum attenuation of less than 0.3 dB/Km at a wavelength of 1550nm.
2. The optical waveguide cable (100) as claimed in claim 1,wherein the central robust component (102) has a radius of about 2.5 mm, wherein the central robust component (102) with the first layer (104a) has a diameter in a range of about 7.7 mm ± 0.1 mm.
3. The optical waveguide cable (100) as claimed in claim 1, wherein the at least one cylindrical enclosure (106) comprises an at least one optical waveguide ribbon, wherein the at least one optical waveguide ribbon comprises at least one optical waveguide (110), wherein the at least one optical waveguide ribbon with the at least one optical waveguide (110) being helically arranged inside the at least one cylindrical enclosure (106).
Page 34/38
4. The optical waveguide cable (100) as claimed in claim 1, wherein the first layer (104a) is made of a material selected from a group consisting of polyethylene, elastomer and low smoke zero halogen.
5. The optical waveguide cable (100) as claimed in claim 1, wherein the optical waveguide cable (100) has a weight in a range of about 470 kg/km ±10% kg/km.
6. The optical waveguide cable (100) as claimed in claim 1, wherein the second layer (104b) is a water swellable tape, wherein the second layer (104b) has a thickness in a range of about 0.25 mm ± 0.05 mm.
7. The optical waveguide cable (100) as claimed in claim 1, wherein the third layer (104c) is a binder yarn, wherein the third layer (104c) is made of a thread.
8. The optical waveguide cable (100) as claimed in claim 1, wherein the cylindrical enclosure (106) has a density of less than 0.94 Kg/m3.
9. The optical waveguide cable (100) as claimed in claim 1, wherein the fourth layer (112) is a binder yarn, wherein the fourth layer (112) being arranged helically in clockwise direction over the at least one cylindrical enclosure (106) and wherein the fourth layer (112) is made of a polyester thread.
10. The optical waveguide cable (100) as claimed in claim 1, wherein the fifth layer (114) is a binder yarn, wherein the fifth layer (114) being arranged helically in opposite direction to the
Page 35/38
fourth layer (112) in anti-clockwise direction over the fourth layer (112), wherein the fifth layer (114) is made of polyester thread.
11. The optical waveguide cable (100) as claimed in claim 1, wherein the sixth layer (116) is a water blocking tape surrounding the fifth layer (114), wherein the sixth layer (116) has a thickness in a range of about 0.5 mm + 0.05 mm.
12. The optical waveguide cable (100) as claimed in claim 1, wherein the seventh layer (118) is a helically arranged binder yarn, wherein the seventh layer (118) is made of polyester thread.
13. The optical waveguide cable (100) as claimed in claim 1, wherein the eighth layer (120) is an outer sheath, wherein the eighth layer (120) is made up of high density polyethylene having a density greater than or equal to 0.94 g/cm3, wherein the eighth layer (120) has a thickness in a range of about 1.6 mm to 2.2 mm.
14. The optical waveguide cable (100) as claimed in claim 1, wherein the eighth layer (120) is one of hexagonal, ribbed and circular in shape.
15. The optical waveguide cable (100) as claimed in claim 1, wherein the optical waveguide (110) has a short term tensile strength of about 2700 Newton’s and long term tensile strength of about 890 Newton’s.
Page 36/38
16. The optical waveguide cable (100) as claimed in claim 1, wherein the at least one cylindrical enclosure (106) is replaced with one or more filler.
17. The optical waveguide cable (100) as claimed in claim 1, wherein the optical waveguide (110) has a dispersion of less than 0.2 ps/nm.km.
18. The optical waveguide cable (100) as claimed in claim 1, wherein the optical waveguide cable (100) comprises 864 optical waveguides, wherein the 864 optical waveguides being arranged in a plurality of optical waveguide ribbons in each cylindrical enclosure (106).
19. The optical waveguide cable (100) as claimed in claim 1, wherein the optical waveguide cable (100) comprises 288 optical waveguides.
20. The optical waveguide cable (100) as claimed in claim 1, wherein the optical waveguide cable (100) comprises 432 optical waveguides.
21. The optical waveguide cable (100) as claimed in claim 1, wherein the optical waveguide cable (100) comprises 720 optical waveguides.
22. The optical waveguide cable (100) as claimed in claim 1, wherein the optical waveguide cable (100) comprise 1152 optical waveguides.
Page 37/38
23. The optical waveguide cable (100) as claimed in claim 1, wherein the optical waveguide cable (100) comprise 1728 optical waveguides.
24. The optical waveguide cable (100) as claimed in claim 1, wherein the at least one cylindrical enclosure (106) comprise a plurality of individual optical waveguides (110).
25. The optical waveguide cable (100) as claimed in claim 1, wherein the optical waveguide cable (100) with 864 optical waveguides has a diameter in a range of about 28 mm + 1 mm, wherein the optical waveguide cable (100) has a variable diameter for variable number of optical waveguides present inside the cylindrical enclosure (106) of the optical waveguide cable (100).
26. The optical waveguide cable (100) as claimed in claim 1, wherein the at least one optical waveguide (110) arranged in a plurality of optical waveguide ribbons has a loss of less than 0.22 dB/km at a wavelength of 1550nm and a loss of less than 0.25 dB/km at a wavelength of 1625nm.